// // SPAlertController.m // SPAlertController // // Created by 乐升平 on 17/10/12. https://github.com/SPStore/SPAlertController // Copyright © 2017年 iDress. All rights reserved. // #import "SPAlertController.h" #define ScreenWidth [UIScreen mainScreen].bounds.size.width #define ScreenHeight [UIScreen mainScreen].bounds.size.height #define actionHeight 48.0 #define actionColor [UIColor colorWithWhite:1 alpha:0.8] #define alertColor [UIColor colorWithWhite:1 alpha:0] #define isIPhoneX ([UIScreen mainScreen].bounds.size.height==812) #define alertBottomMargin isIPhoneX ? 34 : 0 // 适配iPhoneX #pragma mark ---------------------------- SPAlertAction begin -------------------------------- @interface SPAlertAction() @property (nullable, nonatomic) NSString *title; @property (nonatomic, assign) SPAlertActionStyle style; @property (nonatomic, copy) void (^handler)(SPAlertAction *action); // 当在addAction之后设置action属性时,会回调这个block,设置相应控件的字体、颜色等 // 如果没有这个block，那使用时，只有在addAction之前设置action的属性才有效 @property (nonatomic, copy) void (^propertyEvent)(SPAlertAction *action); @end @implementation SPAlertAction - (id)copyWithZone:(NSZone *)zone { SPAlertAction *action = [[[self class] alloc] init]; action.title = [self.title copy]; action.style = self.style; action.enabled = self.enabled; action.titleColor = self.titleColor; action.titleFont = self.titleFont; action.handler = self.handler; return action; } + (instancetype)actionWithTitle:(nullable NSString *)title style:(SPAlertActionStyle)style handler:(void (^ __nullable)(SPAlertAction *action))handler { SPAlertAction *action = [[self alloc] initWithTitle:title style:(SPAlertActionStyle)style handler:handler]; return action; } - (instancetype)initWithTitle:(nullable NSString *)title style:(SPAlertActionStyle)style handler:(void (^ __nullable)(SPAlertAction *action))handler { if (self = [super init]) { self.title = title; self.style = style; self.enabled = YES; // 默认能点击 self.handler = handler; } return self; } - (void)setTitleColor:(UIColor *)titleColor { _titleColor = titleColor; if (self.propertyEvent) { self.propertyEvent(self); } } - (void)setTitleFont:(UIFont *)titleFont { _titleFont = titleFont; if (self.propertyEvent) { self.propertyEvent(self); } } - (void)setEnabled:(BOOL)enabled { _enabled = enabled; if (self.propertyEvent) { self.propertyEvent(self); } } @end #pragma mark ---------------------------- SPAlertAction end -------------------------------- #pragma mark ---------------------------- SPAlertControllerActionCell begin -------------------------------- @interface SPAlertControllerActionCell : UITableViewCell @property (nonatomic, strong) SPAlertAction *action; @property (nonatomic, weak) UILabel *titleLabel; @property (nonatomic, strong) NSMutableArray *titleLabelConstraints; @end @implementation SPAlertControllerActionCell - (instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier { if (self = [super initWithStyle:style reuseIdentifier:reuseIdentifier]) { UILabel *titleLabel = [[UILabel alloc] init]; titleLabel.translatesAutoresizingMaskIntoConstraints = NO; // 设置垂直方向的抗压缩优先级,优先级越高越不容易被压缩,默认的优先级是750 [titleLabel setContentCompressionResistancePriority:998.f forAxis:UILayoutConstraintAxisVertical]; titleLabel.textAlignment = NSTextAlignmentCenter; titleLabel.lineBreakMode = NSLineBreakByTruncatingMiddle; [titleLabel sizeToFit]; // footerCell指的是SPAlertControllerStyleActionSheet下的取消cell和SPAlertControllerStyleAlert下actions小于_maxNumberOfActionHorizontalArrangementForAlert时的cell // 这个cell因为要修改系统自带的布局，如果直接加在contentView上，修改contentView的布局很容易出问题，所以此时用不着contentView，而且这个cell跟tableView没有任何关系，就是一个普通的view if ([reuseIdentifier isEqualToString:@"footerCell"]) { self.backgroundColor = actionColor; // contentView在此处没用了 self.contentView.backgroundColor = [UIColor clearColor]; [self addSubview:titleLabel]; } else { // 设置背景透明，默认是白色，白色会阻挡分割线 self.backgroundColor = [UIColor clearColor]; // contentView默认是透明色，给一个颜色，更加突出分割线（contentView的高度比cell小0.5，0.5就是分割线的高度） self.contentView.backgroundColor = actionColor; [self.contentView addSubview:titleLabel]; } _titleLabel = titleLabel; [self setNeedsUpdateConstraints]; } return self; } - (void)setAction:(SPAlertAction *)action { _action = action; self.titleLabel.text = action.title; if (action.enabled) { self.titleLabel.textColor = action.titleColor; self.titleLabel.font = action.titleFont; } else { self.titleLabel.textColor = [UIColor lightGrayColor]; self.titleLabel.font = [UIFont systemFontOfSize:17]; } self.userInteractionEnabled = action.enabled; [self setNeedsUpdateConstraints]; } - (void)updateConstraints { [super updateConstraints]; UILabel *titleLabel = self.titleLabel; NSMutableArray *titleLabelConstraints = [NSMutableArray array]; if (self.titleLabelConstraints) { [titleLabel.superview removeConstraints:self.titleLabelConstraints]; self.titleLabelConstraints = nil; } [titleLabelConstraints addObject:[NSLayoutConstraint constraintWithItem:titleLabel attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:titleLabel.superview attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; [titleLabelConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-(>=0)-[titleLabel]-(>=0)-|"] options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleLabel)]]; [titleLabelConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[titleLabel]-0-|"] options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleLabel)]]; [titleLabel.superview addConstraints:titleLabelConstraints]; self.titleLabelConstraints = titleLabelConstraints; } + (BOOL)requiresConstraintBasedLayout { return YES; } @end #pragma mark ---------------------------- SPAlertControllerActionCell end -------------------------------- #pragma mark ---------------------------- SPAlertController begin -------------------------------- @interface SPAlertController () @property (nonatomic, strong) UIView *alertView; @property (nonatomic, weak) UIVisualEffectView *alertEffectView; // ---------------- 头部控件 --------------- @property (nonatomic, weak) UIView *headerBezelView; @property (nonatomic, weak) UIScrollView *headerScrollView; @property (nonatomic, weak) UIView *headerScrollContentView; // autoLayout中需要在scrollView上再加一个view @property (nonatomic, weak) UIView *titleView; @property (nonatomic, strong) UILabel *titleLabel; @property (nonatomic, strong) UILabel *detailTitleLabel; @property (nonatomic, weak) UIView *textFieldView; // ---------------- 头部控件的约束数组 ----------------- @property (nonatomic, strong) NSMutableArray *headerBezelViewConstraints; @property (nonatomic, strong) NSMutableArray *headerScrollContentViewConstraints; @property (nonatomic, strong) NSMutableArray *titleViewConstraints; @property (nonatomic, strong) NSMutableArray *titleLabelConstraints; @property (nonatomic, strong) NSMutableArray *textFieldViewConstraints; @property (nonatomic, strong) NSMutableArray *textFieldConstraints; // ---------------- action控件 -------------- @property (nonatomic, weak) UIView *actionBezelView; @property (nonatomic, weak) UIView *actionBezelContentView; @property (nonatomic, weak) UITableView *actionTableView; @property (nonatomic, weak) UIView *footerView; // ---------------- action控件的约束数组 ------------------- @property (nonatomic, strong) NSMutableArray *actionBezelViewConstraints; @property (nonatomic, strong) NSMutableArray *actionBezelContentViewConstraints; @property (nonatomic, strong) NSMutableArray *footerViewConstraints; @property (nonatomic, strong) NSMutableArray *footerActionViewConstraints; // ---------------- 自定义view -------------- @property (nonatomic, strong) UIView *customView; @property (nonatomic, strong) UIView *customTitleView; @property (nonatomic, strong) UIView *customCenterView; @property (nonatomic, strong) UIView *customFooterView; @property (nonatomic, assign) CGSize customViewSize; @property (nonatomic, assign) CGSize customTitleViewSize; @property (nonatomic, assign) CGSize customCenterViewSize; @property (nonatomic, assign) CGSize customFooterViewSize; // ---------------- action控件的约束数组 ------------------- @property (nonatomic, strong) NSMutableArray *customViewConstraints; // action数组 @property (nonatomic) NSArray *actions; // tableView的数据源,与actions数组息息相关 @property (nonatomic, strong) NSArray *dataSource; // 取消的action @property (nonatomic, strong) SPAlertAction *cancelAction; // textFiled数组 @property (nonatomic) NSArray *textFields; @property (nonatomic, assign) SPAlertControllerStyle preferredStyle; @property (nonatomic, assign) SPAlertAnimationType animationType; @property (nonatomic, assign) BOOL keyboardShow; @property (nonatomic, assign) NSLayoutConstraint *alertConstraintCenterY; @end @implementation SPAlertController @synthesize title = _title; - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view. } - (void)dealloc { [[NSNotificationCenter defaultCenter] removeObserver:self]; } #pragma mark - Public + (instancetype)alertControllerWithTitle:(nullable NSString *)title message:(nullable NSString *)message preferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType { SPAlertController *alertController = [self alertControllerWithTitle:title message:message preferredStyle:preferredStyle animationType:animationType customView:nil]; return alertController; } + (instancetype)alertControllerWithTitle:(nullable NSString *)title message:(nullable NSString *)message preferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType customView:(UIView *)customView { // 创建控制器 SPAlertController *alertController = [[SPAlertController alloc] initWithTitle:title message:message preferredStyle:preferredStyle animationType:animationType customView:customView customTitleView:nil customCenterView:nil customFooterView:nil]; return alertController; } + (instancetype)alertControllerWithPreferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType customTitleView:(nullable UIView *)customTitleView { // 创建控制器 SPAlertController *alertController = [[SPAlertController alloc] initWithTitle:nil message:nil preferredStyle:preferredStyle animationType:animationType customView:nil customTitleView:customTitleView customCenterView:nil customFooterView:nil]; return alertController; } + (instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message preferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType customCenterView:(UIView *)customCenterView { // 创建控制器 SPAlertController *alertController = [[SPAlertController alloc] initWithTitle:title message:message preferredStyle:preferredStyle animationType:animationType customView:nil customTitleView:nil customCenterView:customCenterView customFooterView:nil]; return alertController; } + (instancetype)alertControllerWithTitle:(NSString *)title message:(NSString *)message preferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType customFooterView:(UIView *)customFooterView { // 创建控制器 SPAlertController *alertController = [[SPAlertController alloc] initWithTitle:title message:message preferredStyle:preferredStyle animationType:animationType customView:nil customTitleView:nil customCenterView:nil customFooterView:customFooterView]; return alertController; } - (void)addAction:(SPAlertAction *)action { if ([self.actions containsObject:action]) { return; } NSMutableArray *array = self.actions.mutableCopy; if (self.cancelAction && self.preferredStyle == SPAlertControllerStyleActionSheet) { // 如果在取消按钮已经存在的情况下，action又是取消按钮，直接报异常 NSAssert(action.style != SPAlertActionStyleCancel, @"SPAlertController不允许多个取消按钮,你可以检查是否多次设置了SPAlertActionStyleCancel"); NSInteger index = [self.actions indexOfObject:self.cancelAction]; // 将这个action插入到cancelAction之前，目的是保证cancelAction永远处于数组最后一个位置 [array insertObject:action atIndex:index]; } else { [array addObject:action]; } self.actions = array; if (self.preferredStyle == SPAlertControllerStyleActionSheet) { if (self.customCenterView && action.style != SPAlertActionStyleCancel) { NSLog(@"当自定义centerView时，SPAlertControllerStyleActionSheet下，除了取消样式的按钮之外，其余样式的按钮均不显示"); [array removeObject:action]; self.actions = array; [self layoutViewConstraints]; return; } if (action.style == SPAlertActionStyleCancel && !self.customFooterView) { self.cancelAction = action; [self createFooterActionView:action]; } self.dataSource = self.cancelAction ? [array subarrayWithRange:NSMakeRange(0, array.count-1)].copy : array.copy; } else { if (self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert && !self.customFooterView) { [self createFooterActionView:action]; // 当只有_maxNumberOfActionHorizontalArrangementForAlert个action时，不需要tableView，这里没有移除tableView，而是清空数据源，如果直接移除tableView，当大于_maxNumberOfActionHorizontalArrangementForAlert个action时又得加回来 self.dataSource = nil; } else { if (self.customCenterView) { NSLog(@"当自定义centerView时，SPAlertControllerStyleAlert下，action的个数最多只能是_maxNumberOfActionHorizontalArrangementForAlert个，超过_maxNumberOfActionHorizontalArrangementForAlert个的action将不显示"); [array removeObject:action]; self.actions = array; return; } self.dataSource = array.copy; for (NSInteger i = self.footerView.subviews.count-1; i >= 0; i--) { UIView *footerActionView = self.footerView.subviews[i]; [footerActionView removeFromSuperview]; footerActionView = nil; } } } __weak typeof(self) weakSelf = self; // 当外面在addAction之后再设置action的属性时，会回调这个block action.propertyEvent = ^(SPAlertAction *action) { if (weakSelf.preferredStyle == SPAlertControllerStyleActionSheet) { if (action.style == SPAlertActionStyleCancel) { // 注意这个cell是与tableView没有任何瓜葛的 SPAlertControllerActionCell *footerCell = weakSelf.footerView.subviews.lastObject; footerCell.action = action; } else { // 刷新tableView [weakSelf.actionTableView reloadData]; } } else { if (weakSelf.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert) { NSInteger index = [weakSelf.actions indexOfObject:action]; SPAlertControllerActionCell *footerCell = weakSelf.footerView.subviews[index]; footerCell.action = action; } else { [weakSelf.actionTableView reloadData]; } } }; // 刷新tableView [self.actionTableView reloadData]; [self layoutViewConstraints]; } - (void)addTextFieldWithConfigurationHandler:(void (^)(UITextField * _Nonnull))configurationHandler { UITextField *textField = [[UITextField alloc] init]; textField.translatesAutoresizingMaskIntoConstraints = NO; // 系统的UITextBorderStyleLine样式线条过于黑，所以自己设置 textField.layer.borderWidth = 0.5; textField.layer.borderColor = [UIColor grayColor].CGColor; // 在左边设置一张view，充当光标左边的间距，否则光标紧贴textField不美观 textField.leftView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 5, 0)]; textField.leftView.userInteractionEnabled = NO; textField.leftViewMode = UITextFieldViewModeAlways; textField.font = [UIFont systemFontOfSize:14]; NSMutableArray *array = self.textFields.mutableCopy; [array addObject:textField]; self.textFields = array; if (configurationHandler) { configurationHandler(textField); } } - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section { return self.dataSource.count; } - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { SPAlertControllerActionCell *cell = [tableView dequeueReusableCellWithIdentifier:NSStringFromClass([SPAlertControllerActionCell class]) forIndexPath:indexPath]; SPAlertAction *action = self.dataSource[indexPath.row]; cell.action = action; return cell; } #pragma mark - TableView Method - (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath { return actionHeight; } - (void)tableView:(UITableView *)tableView willDisplayCell:(UITableViewCell *)cell forRowAtIndexPath:(NSIndexPath *)indexPath { // 设置cell分割线整宽 // Remove seperator inset if ([cell respondsToSelector:@selector(setSeparatorInset:)]) { [cell setSeparatorInset:UIEdgeInsetsZero]; } // Prevent the cell from inheriting the Table View's margin settings if ([cell respondsToSelector:@selector(setPreservesSuperviewLayoutMargins:)]) { [cell setPreservesSuperviewLayoutMargins:NO]; } // Explictly set your cell's layout margins if ([cell respondsToSelector:@selector(setLayoutMargins:)]) { [cell setLayoutMargins:UIEdgeInsetsZero]; } } - (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { // 动画置为NO，如果动画为YES，当点击cell退出控制器时会有延迟,延迟时长时短 [tableView deselectRowAtIndexPath:indexPath animated:NO]; SPAlertAction *action = self.dataSource[indexPath.row]; // 回调action的block if (action.handler) { action.handler(action); } [self dismissViewControllerAnimated:YES completion:nil]; } #pragma mark - Private - (instancetype)initWithTitle:(nullable NSString *)title message:(nullable NSString *)message preferredStyle:(SPAlertControllerStyle)preferredStyle animationType:(SPAlertAnimationType)animationType customView:(UIView *)customView customTitleView:(UIView *)customTitleView customCenterView:(UIView *)customCenterView customFooterView:(UIView *)customFooterView{ if (self = [super init]) { // 是否视图控制器定义它呈现视图控制器的过渡风格（默认为NO） self.providesPresentationContextTransitionStyle = YES; self.definesPresentationContext = YES; self.modalPresentationStyle = UIModalPresentationCustom; self.transitioningDelegate = self; _title = title; _message = message; self.preferredStyle = preferredStyle; // 如果是默认动画，preferredStyle为alert时动画默认为fade，preferredStyle为actionShee时动画默认为raiseUp if (animationType == SPAlertAnimationTypeDefault) { if (self.preferredStyle == SPAlertControllerStyleAlert) { animationType= SPAlertAnimationTypeAlpha; } else if (self.preferredStyle == SPAlertControllerStyleActionSheet) { animationType = SPAlertAnimationTypeRaiseUp; } else { animationType = SPAlertAnimationTypeRaiseUp; } } self.animationType = animationType; // 添加子控件 [self setupViewsWithCustomView:customView customTitleView:customTitleView customCenterView:customCenterView customFooterView:customFooterView]; self.needBlur = YES; self.cornerRadiusForAlert = 5; self.maxTopMarginForActionSheet = isIPhoneX ? 44 : 0; self.maxMarginForAlert = 20.0; self.maxNumberOfActionHorizontalArrangementForAlert = 2; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil]; [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardDidHide:) name:UIKeyboardDidHideNotification object:nil]; } return self; } - (void)setupViewsWithCustomView:(UIView *)customView customTitleView:(UIView *)customTitleView customCenterView:(UIView *)customCenterView customFooterView:(UIView *)customFooterView { UIView *alertView = [[UIView alloc] init]; alertView.frame = self.view.bounds; alertView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [self.view addSubview:alertView]; _alertView = alertView; if (!customView) { // 没有自定义整个对话框 UIView *headerBezelView = [[UIView alloc] init]; headerBezelView.translatesAutoresizingMaskIntoConstraints = NO; [alertView addSubview:headerBezelView]; _headerBezelView = headerBezelView; // 创建头部scrollView UIScrollView *headerScrollView = [[UIScrollView alloc] init]; headerScrollView.frame = headerBezelView.bounds; headerScrollView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; headerScrollView.showsHorizontalScrollIndicator = NO; if ([[UIDevice currentDevice].systemVersion floatValue] >= 11.0) { // actionTableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever; } else { // Fallback on earlier versions } [headerBezelView addSubview:headerScrollView]; _headerScrollView = headerScrollView; UIView *headerScrollContentView = [[UIView alloc] init]; headerScrollContentView.translatesAutoresizingMaskIntoConstraints = NO; headerScrollContentView.backgroundColor = actionColor; [headerScrollView addSubview:headerScrollContentView]; _headerScrollContentView = headerScrollContentView; if (!customTitleView) { // 不是自定义的titleView UIView *titleView = [[UIView alloc] init]; titleView.translatesAutoresizingMaskIntoConstraints = NO; [headerScrollContentView addSubview:titleView]; _titleView = titleView; UIView *textFieldView = [[UIView alloc] init]; textFieldView.translatesAutoresizingMaskIntoConstraints = NO; [headerScrollContentView addSubview:textFieldView]; _textFieldView = textFieldView; if (self.title.length) { self.titleLabel.text = self.title; [titleView addSubview:self.titleLabel]; } if (self.message.length) { self.detailTitleLabel.text = self.message; [titleView addSubview:self.detailTitleLabel]; } } else { // 是自定义的titleView self.customTitleView = customTitleView; } UIView *actionBezelView = [[UIView alloc] init]; actionBezelView.translatesAutoresizingMaskIntoConstraints = NO; [alertView addSubview:actionBezelView]; _actionBezelView = actionBezelView; if (!customCenterView) { UIView *actionBezelContentView = [[UIView alloc] init]; actionBezelContentView.translatesAutoresizingMaskIntoConstraints = NO; [actionBezelView addSubview:actionBezelContentView]; _actionBezelContentView = actionBezelContentView; UITableView *actionTableView = [[UITableView alloc] initWithFrame:CGRectZero style:UITableViewStylePlain]; actionTableView.frame = actionBezelContentView.bounds; actionTableView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; actionTableView.showsHorizontalScrollIndicator = NO; actionTableView.alwaysBounceVertical = NO; // tableView内容没有超出contentSize时，禁止滑动 actionTableView.backgroundColor = [UIColor clearColor]; actionTableView.separatorColor = [UIColor clearColor]; actionTableView.dataSource = self; actionTableView.delegate = self; if ([[UIDevice currentDevice].systemVersion floatValue] >= 11.0) { // actionTableView.contentInsetAdjustmentBehavior = UIScrollViewContentInsetAdjustmentNever; } else { // Fallback on earlier versions } [actionTableView registerClass:[SPAlertControllerActionCell class] forCellReuseIdentifier:NSStringFromClass([SPAlertControllerActionCell class])]; [actionBezelContentView addSubview:actionTableView]; _actionTableView = actionTableView; } else { [self.actionBezelContentView removeFromSuperview]; self.actionBezelContentView = nil; self.customCenterView = customCenterView; } if (!customFooterView) { UIView *footerView = [[UIView alloc] init]; footerView.translatesAutoresizingMaskIntoConstraints = NO; [_actionBezelView addSubview:footerView]; _footerView = footerView; } else { [self.footerView removeFromSuperview]; self.footerView = nil; self.customFooterView = customFooterView; } [self layoutViewConstraints]; } else { [self.alertView.subviews enumerateObjectsUsingBlock:^(__kindof UIView * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) { [obj removeFromSuperview]; obj = nil; }]; self.customView = customView; } } - (void)createFooterActionView:(SPAlertAction *)action { // 这个cell实际上就是一个普通的view，跟tableView没有任何关系，因为cell内部都有现成的控件和布局，直接用这个cell就好，没必要再去自定义一个view，需要注意的是，cell使用了自动布局,contentView会受到影响，看警告对症下药 SPAlertControllerActionCell *footerActionView = [[SPAlertControllerActionCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"footerCell"]; footerActionView.translatesAutoresizingMaskIntoConstraints = NO; footerActionView.contentView.translatesAutoresizingMaskIntoConstraints = NO; footerActionView.action = action; [self.footerView addSubview:footerActionView]; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapFooterActionView:)]; [footerActionView addGestureRecognizer:tap]; } - (void)tapFooterActionView:(UITapGestureRecognizer *)tap { if (self.preferredStyle == SPAlertControllerStyleActionSheet) { if (self.cancelAction.handler) { self.cancelAction.handler(self.cancelAction); } } else { if (self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert) { SPAlertControllerActionCell *footerActionView = (SPAlertControllerActionCell *)tap.view; NSInteger index = [self.footerView.subviews indexOfObject:footerActionView]; SPAlertAction *action = [self.actions objectAtIndex:index]; // 回调action的block if (action.handler) { action.handler(action); } } } [self dismissViewControllerAnimated:YES completion:^{}]; } #pragma mark - 布局 - (void)layoutViewConstraints { if (self.customView) { return; } UIView *alertView = self.alertView; UIView *headerBezelView = self.headerBezelView; UIScrollView *headerScrollView = self.headerScrollView; UIView *headerScrollContentView = self.headerScrollContentView; UIView *titleView = self.customTitleView ? self.customTitleView : self.titleView; UIView *textFieldView = self.textFieldView; UIView *actionBezelView = self.actionBezelView; UIView *actionBezelContentView = self.customCenterView ? self.customCenterView : self.actionBezelContentView; UIView *footerView = self.customFooterView ? self.customFooterView : self.footerView; // 预备相应控件的约束数组 NSMutableArray *headerBezelViewConstraints = [NSMutableArray array]; NSMutableArray *headerScrollContentViewConstraints = [NSMutableArray array]; NSMutableArray *titleViewConstraints = [NSMutableArray array]; NSMutableArray *titleLabelConstraints = [NSMutableArray array]; NSMutableArray *texFieldViewConstraints = [NSMutableArray array]; NSMutableArray *textFieldConstraints = [NSMutableArray array]; NSMutableArray *actionBezelViewConstraints = [NSMutableArray array]; NSMutableArray *actionBezelContentViewConstraints = [NSMutableArray array]; NSMutableArray *footerViewConstraints = [NSMutableArray array]; NSMutableArray *footerActionViewConstraints = [NSMutableArray array]; // 移除存在的约束 if (self.headerBezelViewConstraints) { [alertView removeConstraints:self.headerBezelViewConstraints]; self.headerBezelViewConstraints = nil; } if (self.headerScrollContentViewConstraints) { [headerScrollView removeConstraints:self.headerScrollContentViewConstraints]; self.headerScrollContentViewConstraints = nil; } if (self.titleViewConstraints) { [headerScrollContentView removeConstraints:self.titleViewConstraints]; self.titleViewConstraints = nil; } if (self.titleLabelConstraints) { [titleView removeConstraints:self.titleLabelConstraints]; self.titleLabelConstraints = nil; } if (self.textFieldViewConstraints) { [headerScrollContentView removeConstraints:self.textFieldViewConstraints]; self.textFieldViewConstraints = nil; } if (self.textFieldConstraints) { [textFieldView removeConstraints:self.textFieldConstraints]; self.textFieldConstraints = nil; } if (self.actionBezelViewConstraints) { [alertView removeConstraints:self.actionBezelViewConstraints]; self.actionBezelViewConstraints = nil; } if (self.actionBezelContentViewConstraints) { [actionBezelView removeConstraints:self.actionBezelContentViewConstraints]; self.actionBezelContentViewConstraints = nil; } if (self.footerViewConstraints) { [actionBezelView removeConstraints:self.footerViewConstraints]; self.footerViewConstraints = nil; } if (self.footerActionViewConstraints) { [footerView removeConstraints:self.footerActionViewConstraints]; self.footerActionViewConstraints = nil; } CGFloat margin = 15; CGFloat footerTopMargin = self.cancelAction ? 6.0 : 0.0; CGFloat headerActionPadding = (!titleView.subviews.count || !self.actions.count) ? 0 : 0.5; // 计算好actionBezelView的高度, 本也可以让设置每个子控件都高度约束，以及顶底约束和子控件之间的间距，这样便可以把actionBezelView的高度撑起来，但是这里要比较一下actionBezelView和headerBezelView的高度优先级，所以父控件设置高度比较方便，谁的优先级高，谁展示的内容就更多 CGFloat actionBezelHeight = [self actionBezelHeight:footerTopMargin]; [headerBezelViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[headerBezelView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerBezelView)]]; [headerBezelViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[headerBezelView]-%f-[actionBezelView]-0-|",headerActionPadding] options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerBezelView,actionBezelView)]]; // headerBezelView的高度最大为(self.view.bounds.size.height-itemHeight) [headerBezelViewConstraints addObject:[NSLayoutConstraint constraintWithItem:headerBezelView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationLessThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:self.view.bounds.size.height-actionHeight]]; // 暂时先初始化headerBezelView的高度约束 NSLayoutConstraint *headerBezelViewContsraintHeight = [NSLayoutConstraint constraintWithItem:headerBezelView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:0]; /// 设置优先级 headerBezelViewContsraintHeight.priority = 998.0; [headerBezelViewConstraints addObject:headerBezelViewContsraintHeight]; [alertView addConstraints:headerBezelViewConstraints]; // 设置actionScrollContentView的相关约束，值得注意的是不能仅仅设置上下左右间距为0就完事了，对于scrollView的contentView， autoLayout布局必须设置宽或高约束 [headerScrollContentViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[headerScrollContentView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerScrollContentView)]]; [headerScrollContentViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[headerScrollContentView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(headerScrollContentView)]]; [headerScrollContentViewConstraints addObject:[NSLayoutConstraint constraintWithItem:headerScrollContentView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:headerScrollView attribute:NSLayoutAttributeWidth multiplier:1.f constant:0]]; if (_titleLabel.text.length || _detailTitleLabel.text.length) { // 保证headerScrollContentView的高度最小为actionHeight [headerScrollContentViewConstraints addObject:[NSLayoutConstraint constraintWithItem:headerScrollContentView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:actionHeight]]; } [headerScrollView addConstraints:headerScrollContentViewConstraints]; if (!self.customTitleView) { [titleViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[titleView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleView)]]; [titleViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[titleView]-0-[textFieldView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleView,textFieldView)]]; [headerScrollContentView addConstraints:titleViewConstraints]; NSArray *labels = titleView.subviews; [labels enumerateObjectsUsingBlock:^(UILabel *label, NSUInteger idx, BOOL * _Nonnull stop) { // 左右间距 [titleLabelConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-(==margin)-[label]-(==margin)-|"] options:0 metrics:@{@"margin":@(margin)} views:NSDictionaryOfVariableBindings(label)]]; // 第一个子控件顶部间距 if (idx == 0) { [titleLabelConstraints addObject:[NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:titleView attribute:NSLayoutAttributeTop multiplier:1.f constant:margin]]; } // 最后一个子控件底部间距 if (idx == labels.count - 1) { [titleLabelConstraints addObject:[NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:titleView attribute:NSLayoutAttributeBottom multiplier:1.f constant:-margin]]; } // 子控件之间的垂直间距 if (idx > 0) { NSLayoutConstraint *paddingConstraint = [NSLayoutConstraint constraintWithItem:label attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:labels[idx - 1] attribute:NSLayoutAttributeBottom multiplier:1.f constant:margin*0.5]; [titleLabelConstraints addObject:paddingConstraint]; } }]; [titleView addConstraints:titleLabelConstraints]; CGFloat textFieldViewHeight = 0; CGFloat textFieldMargin = 15; CGFloat textFiledHeight = 26; if (self.textFields.count) { textFieldViewHeight = self.textFields.count * textFiledHeight + textFieldMargin + 0.5 * textFieldMargin; } [texFieldViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[textFieldView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(textFieldView)]]; [texFieldViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[titleView]-0-[textFieldView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleView,textFieldView)]]; [texFieldViewConstraints addObject:[NSLayoutConstraint constraintWithItem:textFieldView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:textFieldViewHeight]]; [headerScrollContentView addConstraints:texFieldViewConstraints]; NSArray *textFields = textFieldView.subviews; [textFields enumerateObjectsUsingBlock:^(UITextField *textField, NSUInteger idx, BOOL * _Nonnull stop) { // 左右间距 [textFieldConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"H:|-(==textFieldMargin)-[textField]-(==textFieldMargin)-|"] options:0 metrics:@{@"textFieldMargin":@(textFieldMargin)} views:NSDictionaryOfVariableBindings(textField)]]; [textFieldConstraints addObject:[NSLayoutConstraint constraintWithItem:textField attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.f constant:textFiledHeight]]; // 第一个子控件顶部间距 if (idx == 0) { [textFieldConstraints addObject:[NSLayoutConstraint constraintWithItem:textField attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:textFieldView attribute:NSLayoutAttributeTop multiplier:1.f constant:textFieldMargin*0.5]]; } // 最后一个子控件底部间距 if (idx == textFields.count - 1) { [textFieldConstraints addObject:[NSLayoutConstraint constraintWithItem:textField attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationEqual toItem:textFieldView attribute:NSLayoutAttributeBottom multiplier:1.f constant:-textFieldMargin]]; } // 子控件之间的垂直间距 if (idx > 0) { NSLayoutConstraint *paddingConstraint = [NSLayoutConstraint constraintWithItem:textField attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationEqual toItem:textFields[idx - 1] attribute:NSLayoutAttributeBottom multiplier:1.f constant:0]; [textFieldConstraints addObject:paddingConstraint]; } }]; [textFieldView addConstraints:textFieldConstraints]; } else { // 自定义titleView时，这里的titleView就是customTitleView [titleViewConstraints addObject:[NSLayoutConstraint constraintWithItem:titleView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:_customTitleViewSize.width]]; [titleViewConstraints addObject:[NSLayoutConstraint constraintWithItem:titleView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:headerScrollContentView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; [titleViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[titleView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(titleView)]]; [titleViewConstraints addObject:[NSLayoutConstraint constraintWithItem:titleView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:_customTitleViewSize.height]]; [headerScrollContentView addConstraints:titleViewConstraints]; } // 先强制布局一次，否则下面拿到的CGRectGetMaxY(titleView.frame)还没有值 [headerBezelView setNeedsLayout]; // 确保一定走layoutSubViews(异步) [headerBezelView layoutIfNeeded]; // 立即调用layoutSubViews // 设置headerBezelView的高度(这个高度同样可以通过计算titleLabel和detailTitleLabel的文字高度计算出来,但是那样计算出来的高度会有零点几的误差,只要差了一点,有可能scrollView即便内容没有超过contentSize,仍然能够滑动) CGRect rect; if (!self.customTitleView) { rect = self.textFields.count ? textFieldView.frame : titleView.frame; } else { rect = titleView.frame; } headerBezelViewContsraintHeight.constant = CGRectGetMaxY(rect); // ---------------------------------------------------------------------------- [actionBezelViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[actionBezelView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(actionBezelView)]]; [actionBezelViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[headerBezelView]-%f-[actionBezelView]-0-|",headerActionPadding] options:0 metrics:nil views:NSDictionaryOfVariableBindings(actionBezelView,headerBezelView)]]; NSLayoutConstraint *actionBezelViewHeightContraint = [NSLayoutConstraint constraintWithItem:actionBezelView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:actionBezelHeight]; // 设置优先级，要比上面headerBezelViewContraintHeight的优先级低,这样当文字过多和action同时过多时，都超出了最大限制，此时优先展示文字 actionBezelViewHeightContraint.priority = 997.0f; // 计算最小高度 CGFloat minActionHeight = [self minActionHeight:footerTopMargin]; NSLayoutConstraint *minActionHeightConstraint = [NSLayoutConstraint constraintWithItem:actionBezelView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:minActionHeight]; [actionBezelViewConstraints addObject:minActionHeightConstraint]; [actionBezelViewConstraints addObject:actionBezelViewHeightContraint]; [alertView addConstraints:actionBezelViewConstraints]; // 如果customCenterView有值，actionBezelContentView就是customCenterView if (!self.customCenterView) { [actionBezelContentViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[actionBezelContentView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(actionBezelContentView)]]; } else { [actionBezelContentViewConstraints addObject:[NSLayoutConstraint constraintWithItem:actionBezelContentView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:_customCenterViewSize.width]]; [actionBezelContentViewConstraints addObject:[NSLayoutConstraint constraintWithItem:actionBezelContentView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:actionBezelView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; } [actionBezelContentViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[actionBezelContentView]-%f-[footerView]-0-|",footerTopMargin] options:0 metrics:nil views:NSDictionaryOfVariableBindings(actionBezelContentView,footerView)]]; [actionBezelView addConstraints:actionBezelContentViewConstraints]; if (!self.customFooterView) { // 不是自定义的footerView [footerViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[footerView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(footerView)]]; [footerViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[actionBezelContentView]-%f-[footerView]-0-|",footerTopMargin] options:0 metrics:nil views:NSDictionaryOfVariableBindings(footerView,actionBezelContentView)]]; // 这个条件判断需不需要footerView，不满足条件footerView的高度就给0 if ((self.preferredStyle == SPAlertControllerStyleActionSheet && self.cancelAction) || (self.preferredStyle == SPAlertControllerStyleAlert && (self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert) && self.actions.count)) { [footerViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:actionHeight]]; } else { // 不满足条件，高度置为0，注意给0和不给高度是两回事，给0至少footerView有一个高度约束，不给的话就没有高度约束，这会导致tableView的底部间距设置无效，从而导致tableView不显示 [footerViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:0]]; } [actionBezelView addConstraints:footerViewConstraints]; NSArray *footerActionViews = footerView.subviews; if (footerActionViews.count && ((self.preferredStyle == SPAlertControllerStyleActionSheet && self.cancelAction) || (self.preferredStyle == SPAlertControllerStyleAlert && self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert))) { [footerActionViews enumerateObjectsUsingBlock:^(SPAlertControllerActionCell *footerActionView, NSUInteger idx, BOOL * _Nonnull stop) { // 设置footerActionView的上下间距 [footerActionViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[footerActionView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(footerActionView)]]; // 第一个footerActionView的左间距 if (idx == 0) { [footerActionViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerActionView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:footerView attribute:NSLayoutAttributeLeft multiplier:1.f constant:0]]; } // 最后一个itemView的右间距 if (idx == footerActionViews.count-1) { [footerActionViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerActionView attribute:NSLayoutAttributeRight relatedBy:NSLayoutRelationEqual toItem:footerView attribute:NSLayoutAttributeRight multiplier:1.f constant:-0]]; } if (idx > 0) { // 子控件之间的水平间距 [footerActionViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerActionView attribute:NSLayoutAttributeLeft relatedBy:NSLayoutRelationEqual toItem:footerActionViews[idx - 1] attribute:NSLayoutAttributeRight multiplier:1.f constant:0.5]]; // 等宽 [footerActionViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerActionView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:footerActionViews[idx - 1] attribute:NSLayoutAttributeWidth multiplier:1.f constant:0]]; } // 在这里，这个cell的contentView没有任何作用，但是为了消除控制台打印的contentView应该给一个高度的警告，这里给一个0 [footerActionView.contentView addConstraint:[NSLayoutConstraint constraintWithItem:footerActionView.contentView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:0]]; }]; [footerView addConstraints:footerActionViewConstraints]; } } else { // 是自定义的footerView // 自定义titleView时，这里的titleView就是customTitleView [footerViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:_customFooterViewSize.width]]; actionBezelView.backgroundColor = [UIColor redColor]; actionBezelContentView.backgroundColor = [UIColor greenColor]; if (!self.actions.count) { // 一个action都没有，也就是actionBezelContentView高度为0 [footerViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0.5-[footerView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(footerView)]]; } else { // 有action，也就是actionBezelContentView必须要有高度，因此这里footerView要给高度，系统才能计算出actionBezelContentView的剩余空间 [footerViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:[NSString stringWithFormat:@"V:|-0-[actionBezelContentView]-%f-[footerView]-0-|",footerTopMargin] options:0 metrics:nil views:NSDictionaryOfVariableBindings(footerView,actionBezelContentView)]]; [footerViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:_customFooterViewSize.height]]; } [footerViewConstraints addObject:[NSLayoutConstraint constraintWithItem:footerView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:actionBezelView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; [actionBezelView addConstraints:footerViewConstraints]; } // 强制布局，立刻产生frame [self.view layoutIfNeeded]; // 如果有文本输入框，让头部scrollVIew自动滚动到最底端(这是为了当文字过多时，可以立即滚动到第一个输入框的位置) if (self.textFields.count) { UITextField *firstTextField = self.textFields.firstObject; [self.headerScrollView scrollRectToVisible:firstTextField.frame animated:YES]; } self.headerBezelViewConstraints = headerBezelViewConstraints; self.headerScrollContentViewConstraints = headerScrollContentViewConstraints; self.titleViewConstraints = titleViewConstraints; self.titleLabelConstraints = titleLabelConstraints; self.textFieldViewConstraints = texFieldViewConstraints; self.textFieldConstraints = textFieldConstraints; self.actionBezelViewConstraints = actionBezelViewConstraints; self.actionBezelContentViewConstraints = actionBezelContentViewConstraints; self.footerViewConstraints = footerViewConstraints; self.footerActionViewConstraints = footerActionViewConstraints; } // 布局自定义的view - (void)layoutCustomView { UIView *alertView = self.alertView; UIView *customView = self.customView; NSMutableArray *customViewConstraints = [NSMutableArray array]; if (self.customViewConstraints) { [alertView removeConstraints:self.customViewConstraints]; self.customViewConstraints = nil; } [customViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"H:|-0-[customView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(customView)]]; [customViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[customView]-0-|" options:0 metrics:nil views:NSDictionaryOfVariableBindings(customView)]]; [alertView addConstraints:customViewConstraints]; self.customViewConstraints = customViewConstraints; } - (CGFloat)actionBezelHeight:(CGFloat)footerTopMargin { CGFloat actionBezelHeight = 0; // 计算actionBezelview的高度 if (self.actions.count) { if (self.preferredStyle == SPAlertControllerStyleActionSheet) { if (self.cancelAction) { // 有取消按钮肯定没有自定义footerView if (self.actions.count > 1) { actionBezelHeight = self.actions.count*actionHeight+footerTopMargin; } else { if (self.customCenterView) { // 当有自定义的customCenterView时，最多只会有1个action，在addAction:方法里做了处理 actionBezelHeight = actionHeight+footerTopMargin+_customCenterViewSize.height; } else { actionBezelHeight = actionHeight+footerTopMargin; } } } else { if (self.customCenterView) { actionBezelHeight = _customCenterViewSize.height; } else { if (self.customFooterView) { actionBezelHeight = self.actions.count*actionHeight+_customFooterViewSize.height; } else { actionBezelHeight = self.actions.count*actionHeight; } } } } else if (self.preferredStyle == SPAlertControllerStyleAlert) { if (self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert) { if (!self.customCenterView) { // 当没有自定义的customCenterView时，最多只会有_maxNumberOfActionHorizontalArrangementForAlert个action，在addAction:方法里做了处理 if (self.customFooterView) { actionBezelHeight = _customFooterViewSize.height + actionHeight; } else { actionBezelHeight = actionHeight; } } else { // _maxNumberOfActionHorizontalArrangementForAlert个以上action且customCenterView有值 actionBezelHeight = _customCenterViewSize.height + actionHeight; } } else { if (self.customFooterView) { actionBezelHeight = _customFooterViewSize.height+self.actions.count*actionHeight; } else { actionBezelHeight = self.actions.count*actionHeight; } } } } else { if (self.customCenterView) { actionBezelHeight = _customCenterViewSize.height; } else { if (self.customFooterView) { actionBezelHeight = _customFooterViewSize.height; } } } return actionBezelHeight; } - (CGFloat)minActionHeight:(CGFloat)footerTopMargin { CGFloat minActionHeight = 0; if (self.cancelAction) { if (self.actions.count > 3) { // 有一个取消按钮且其余按钮在3个或3个以上 minActionHeight = 3.5*actionHeight+footerTopMargin; } else { minActionHeight = self.actions.count * actionHeight + footerTopMargin; } } else { if (self.actions.count > 3) { // 没有取消按钮，其余按钮在3个或3个以上 if (self.actions.count <= _maxNumberOfActionHorizontalArrangementForAlert) { minActionHeight = minActionHeight; } else { minActionHeight = 3.5 * actionHeight; } } else { if (self.preferredStyle == SPAlertControllerStyleAlert) { if (self.actions.count) { minActionHeight = actionHeight; } } else { minActionHeight = self.actions.count * actionHeight; } } } // 如果是自定义的footerView，高度还要在上面计算的基础上加上footerView的高度 if (self.customFooterView) { minActionHeight = minActionHeight+_customFooterViewSize.height; } return minActionHeight; } #pragma mark - setter - (void)setTitle:(NSString *)title { _title = [title copy]; self.titleLabel.text = title; if (!self.titleLabel.superview) { if (_detailTitleLabel) { [self.titleView insertSubview:_titleLabel belowSubview:_detailTitleLabel]; } else { [self.titleView addSubview:_titleLabel]; } } [self.view setNeedsUpdateConstraints]; } - (void)setMessage:(NSString *)message { _message = [message copy]; self.detailTitleLabel.text = message; if (!self.detailTitleLabel.superview) { [self.titleView addSubview:_detailTitleLabel]; } [self.view setNeedsUpdateConstraints]; } - (void)setTitleColor:(UIColor *)titleColor { _titleColor = titleColor; self.titleLabel.textColor = titleColor; } - (void)setTitleFont:(UIFont *)titleFont { _titleFont = titleFont; self.titleLabel.font = titleFont; } - (void)setMessageColor:(UIColor *)messageColor { _messageColor = messageColor; self.detailTitleLabel.textColor = messageColor; } - (void)setMessageFont:(UIFont *)messageFont { _messageFont = messageFont; self.detailTitleLabel.font = messageFont; } - (void)setNeedBlur:(BOOL)needBlur { _needBlur = needBlur; if (!needBlur) { self.alertView.backgroundColor = [UIColor colorWithDisplayP3Red:200.0/255.0 green:200.0/255.0 blue:200.0/255.0 alpha:1]; [self.alertEffectView removeFromSuperview]; self.alertEffectView = nil; } else { UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleExtraLight]; UIVisualEffectView *alertEffectView = [[UIVisualEffectView alloc] initWithEffect:effect]; alertEffectView.frame = self.alertView.bounds; alertEffectView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth; [self.alertView insertSubview:alertEffectView atIndex:0]; } } - (void)setMaxTopMarginForActionSheet:(CGFloat)maxTopMarginForActionSheet { _maxTopMarginForActionSheet = maxTopMarginForActionSheet; if (self.customView) { [self layoutCustomView]; } else { [self layoutViewConstraints]; } } - (void)setMaxMarginForAlert:(CGFloat)maxMarginForAlert { _maxMarginForAlert = maxMarginForAlert; if (self.customView) { [self layoutCustomView]; } else { // 检查一下customTitleViewSize和customCenterView的宽度是否大于了新的对话框的宽度 if (self.preferredStyle == SPAlertControllerStyleAlert) { if (_customTitleViewSize.width >= ScreenWidth-2*maxMarginForAlert) { _customTitleViewSize.width = ScreenWidth-2*maxMarginForAlert; } if (_customCenterViewSize.width >= ScreenWidth-2*maxMarginForAlert) { _customCenterViewSize.width = ScreenWidth-2*maxMarginForAlert; } if (_customFooterViewSize.width >= ScreenWidth-2*maxMarginForAlert) { _customFooterViewSize.width = ScreenWidth-2*maxMarginForAlert; } } else { if (_customTitleViewSize.width >= ScreenWidth) { _customTitleViewSize.width = ScreenWidth; } if (_customCenterViewSize.width >= ScreenWidth) { _customCenterViewSize.width = ScreenWidth; } if (_customFooterViewSize.width >= ScreenWidth) { _customFooterViewSize.width = ScreenWidth; } } [self layoutViewConstraints]; } } - (void)setMaxNumberOfActionHorizontalArrangementForAlert:(NSInteger)maxNumberOfActionHorizontalArrangementForAlert { _maxNumberOfActionHorizontalArrangementForAlert = maxNumberOfActionHorizontalArrangementForAlert; if (self.customFooterView) { _maxNumberOfActionHorizontalArrangementForAlert = -1; } } - (void)setCornerRadiusForAlert:(CGFloat)cornerRadiusForAlert { _cornerRadiusForAlert = cornerRadiusForAlert; if (self.preferredStyle == SPAlertControllerStyleAlert) { self.view.layer.cornerRadius = cornerRadiusForAlert; self.view.layer.masksToBounds = YES; } } - (void)setOffsetYForAlert:(CGFloat)offsetYForAlert { _offsetYForAlert = offsetYForAlert; } - (void)setCustomView:(UIView *)customView { _customView = customView; [customView layoutIfNeeded]; _customViewSize = customView.frame.size; customView.translatesAutoresizingMaskIntoConstraints = NO; [self.alertView addSubview:customView]; [self layoutCustomView]; } - (void)setCustomTitleView:(UIView *)customTitleView { _customTitleView = customTitleView; [customTitleView layoutIfNeeded]; _customTitleViewSize = customTitleView.bounds.size; if (_customTitleViewSize.width <= 0 || _customTitleViewSize.width >= ScreenWidth-2*_maxMarginForAlert) { _customTitleViewSize.width = ScreenWidth-2*_maxMarginForAlert; } if (_customTitleViewSize.height <= 0) { NSLog(@"你的customTitleView高度为小于等于0,请设置一个高度"); } customTitleView.translatesAutoresizingMaskIntoConstraints = NO; [self.headerScrollContentView addSubview:customTitleView]; } - (void)setCustomCenterView:(UIView *)customCenterView { _customCenterView = customCenterView; [customCenterView layoutIfNeeded]; _customCenterViewSize = customCenterView.bounds.size; if (_customCenterViewSize.width <= 0 || _customCenterViewSize.width >= ScreenWidth-2*_maxMarginForAlert) { _customCenterViewSize.width = ScreenWidth-2*_maxMarginForAlert; } if (_customCenterViewSize.height <= 0) { NSLog(@"你的customCenterView高度为小于等于0,请设置一个高度"); } customCenterView.translatesAutoresizingMaskIntoConstraints = NO; [self.actionBezelView addSubview:customCenterView]; } - (void)setCustomFooterView:(UIView *)customFooterView { _customFooterView = customFooterView; [customFooterView layoutIfNeeded]; _customFooterViewSize = customFooterView.bounds.size; if (_customFooterViewSize.width <= 0 || _customFooterViewSize.width >= ScreenWidth-2*_maxMarginForAlert) { _customFooterViewSize.width = ScreenWidth-2*_maxMarginForAlert; } if (_customFooterViewSize.height <= 0) { NSLog(@"你的customFooterView高度为小于等于0,请设置一个高度"); } customFooterView.translatesAutoresizingMaskIntoConstraints = NO; [self.actionBezelView addSubview:customFooterView]; } #pragma mark - getter - (UILabel *)titleLabel { if (!_titleLabel) { _titleLabel = [[UILabel alloc] init]; _titleLabel.translatesAutoresizingMaskIntoConstraints = NO; _titleLabel.textAlignment = NSTextAlignmentCenter; _titleLabel.numberOfLines = 0; _titleLabel.font = [UIFont boldSystemFontOfSize:17]; // 设置垂直方向的抗压缩优先级,优先级越高越不容易被压缩,默认的优先级是750 [_titleLabel setContentCompressionResistancePriority:998.f forAxis:UILayoutConstraintAxisVertical]; [_titleLabel sizeToFit]; } return _titleLabel; } - (UILabel *)detailTitleLabel { if (!_detailTitleLabel) { _detailTitleLabel = [[UILabel alloc] init]; _detailTitleLabel.translatesAutoresizingMaskIntoConstraints = NO; _detailTitleLabel.textAlignment = NSTextAlignmentCenter; _detailTitleLabel.numberOfLines = 0; _detailTitleLabel.font = [UIFont systemFontOfSize:14]; _detailTitleLabel.alpha = 0.5; // 设置垂直方向的抗压缩优先级,优先级越高越不容易被压缩,默认的优先级是750 [_detailTitleLabel setContentCompressionResistancePriority:998.f forAxis:UILayoutConstraintAxisVertical]; [_detailTitleLabel sizeToFit]; } return _detailTitleLabel; } - (NSArray *)actions { if (!_actions) { _actions = [NSArray array]; } return _actions; } - (NSArray *)textFields { if (!_textFields) { _textFields = [NSArray array]; } return _textFields; } #pragma mark - 通知 - (void)keyboardWillShow:(NSNotification *)notification { if (!self.keyboardShow) { // 如果键盘是隐藏状态，本次弹出键盘才去改变alert的中心偏移，否则如果键盘已经是显示状态,什么都不做 CGRect keyboardEndFrame = [notification.userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue]; CGFloat keyboardEndY = keyboardEndFrame.origin.y; CGFloat diff = fabs((self.view.center.y-keyboardEndY*0.5)); // 改变alertView的中心y值，以至于不被键盘遮挡 self.offsetYForAlert = -diff; } self.keyboardShow = YES; } - (void)keyboardDidHide:(NSNotification *)notification { self.keyboardShow = NO; } #pragma mark - UIViewControllerTransitioningDelegate - (nullable id )animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source { return [SPAlertAnimation animationIsPresenting:YES]; } - (nullable id )animationControllerForDismissedController:(UIViewController *)dismissed { [self.view endEditing:YES]; return [SPAlertAnimation animationIsPresenting:NO]; } - (nullable UIPresentationController *)presentationControllerForPresentedViewController:(UIViewController *)presented presentingViewController:(nullable UIViewController *)presenting sourceViewController:(UIViewController *)source NS_AVAILABLE_IOS(8_0) { return [[SPAlertPresentationController alloc] initWithPresentedViewController:presented presentingViewController:presenting]; } @end #pragma mark ---------------------------- SPAlertController end -------------------------------- #pragma mark ---------------------------- SPAlertPresentationController begin -------------------------------- @interface SPAlertPresentationController() @property (nonatomic, strong) UIView *overlayView; @property (nonatomic, strong) NSMutableArray *presentedViewConstraints; @end @implementation SPAlertPresentationController - (instancetype)initWithPresentedViewController:(UIViewController *)presentedViewController presentingViewController:(UIViewController *)presentingViewController { if (self = [super initWithPresentedViewController:presentedViewController presentingViewController:presentingViewController]) { self.presentedView.translatesAutoresizingMaskIntoConstraints = NO; } return self; } - (void)containerViewWillLayoutSubviews { [super containerViewWillLayoutSubviews]; SPAlertController *alertController = (SPAlertController *)self.presentedViewController; CGFloat maxTopMarginForActionSheet = alertController.maxTopMarginForActionSheet; CGFloat maxMarginForAlert = alertController.maxMarginForAlert; CGFloat topMarginForAlert = isIPhoneX ? (maxMarginForAlert+44):maxMarginForAlert; CGFloat bottomMarginForAlert = isIPhoneX ? (maxMarginForAlert+34):maxMarginForAlert; UIView *presentedView = self.presentedView; NSMutableArray *presentedViewConstraints = [NSMutableArray array]; if (self.presentedViewConstraints) { [self.containerView removeConstraints:self.presentedViewConstraints]; self.presentedViewConstraints = nil; } UIView *customView = alertController.customView; if (!customView) { // 非自定义 if (alertController.preferredStyle == SPAlertControllerStyleActionSheet) { [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:ScreenWidth]]; [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; if (alertController.animationType == SPAlertAnimationTypeDropDown) { [presentedViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-0-[presentedView]-(>=alertBottomMargin)-|" options:0 metrics:@{@"maxTopMarginForActionSheet":@(maxTopMarginForActionSheet),@"alertBottomMargin":@(alertBottomMargin)} views:NSDictionaryOfVariableBindings(presentedView)]]; } else { [presentedViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=maxTopMarginForActionSheet)-[presentedView]-(==alertBottomMargin)-|" options:0 metrics:@{@"maxTopMarginForActionSheet":@(maxTopMarginForActionSheet),@"alertBottomMargin":@(alertBottomMargin)} views:NSDictionaryOfVariableBindings(presentedView)]]; } } else if (alertController.preferredStyle == SPAlertControllerStyleAlert) { [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:(MIN(ScreenWidth, ScreenHeight)-2*maxMarginForAlert)]]; [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:self.containerView attribute:NSLayoutAttributeTop multiplier:1.0f constant:topMarginForAlert]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationLessThanOrEqual toItem:self.containerView attribute:NSLayoutAttributeBottom multiplier:1.0f constant:-bottomMarginForAlert]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:alertController.offsetYForAlert]]; NSLog(@"--- %f",alertController.offsetYForAlert); } } else { // 自定义 CGFloat alertH = alertController.customViewSize.height; CGFloat alertW = alertController.customViewSize.width; if (alertH > (self.containerView.bounds.size.height-maxTopMarginForActionSheet)) { alertH = (self.containerView.bounds.size.height-(topMarginForAlert+bottomMarginForAlert)); } if (alertController.preferredStyle == SPAlertControllerStyleActionSheet) { [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:alertW]]; [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; if (alertController.animationType == SPAlertAnimationTypeDropDown) { [presentedViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(==maxTopMarginForActionSheet)-[presentedView]-(>=alertBottomMargin)-|" options:0 metrics:@{@"maxTopMarginForActionSheet":@(maxTopMarginForActionSheet),@"alertBottomMargin":@(alertBottomMargin)} views:NSDictionaryOfVariableBindings(presentedView)]]; } else { [presentedViewConstraints addObjectsFromArray:[NSLayoutConstraint constraintsWithVisualFormat:@"V:|-(>=maxTopMarginForActionSheet)-[presentedView]-(==alertBottomMargin)-|" options:0 metrics:@{@"maxTopMarginForActionSheet":@(maxTopMarginForActionSheet),@"alertBottomMargin":@(alertBottomMargin)} views:NSDictionaryOfVariableBindings(presentedView)]]; } } else { [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeWidth relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:alertW]]; [presentedViewConstraints addObject: [NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0 constant:0]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeTop relatedBy:NSLayoutRelationGreaterThanOrEqual toItem:self.containerView attribute:NSLayoutAttributeTop multiplier:1.0f constant:topMarginForAlert]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeBottom relatedBy:NSLayoutRelationLessThanOrEqual toItem:self.containerView attribute:NSLayoutAttributeBottom multiplier:1.0f constant:-bottomMarginForAlert]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterX relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterX multiplier:1.0f constant:0]]; [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeCenterY relatedBy:NSLayoutRelationEqual toItem:self.containerView attribute:NSLayoutAttributeCenterY multiplier:1.0f constant:alertController.offsetYForAlert]]; } [presentedViewConstraints addObject:[NSLayoutConstraint constraintWithItem:presentedView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0 constant:alertH]]; } [self.containerView addConstraints:presentedViewConstraints]; self.presentedViewConstraints = presentedViewConstraints; } - (void)presentationTransitionWillBegin { [super presentationTransitionWillBegin]; UIView *overlayView = [[UIView alloc] init]; overlayView.frame = self.containerView.bounds; overlayView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; overlayView.backgroundColor = [[UIColor blackColor] colorWithAlphaComponent:0.4]; overlayView.alpha = 0; [self.containerView addSubview:overlayView]; _overlayView = overlayView; UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapOverlayView)]; [overlayView addGestureRecognizer:tap]; SPAlertController *alertController = (SPAlertController *)self.presentedViewController; for (int i = 0; i < alertController.textFields.count; i++) { UITextField *textField = alertController.textFields[i]; [alertController.textFieldView addSubview:textField]; if (i == 0) { [textField becomeFirstResponder]; } } [alertController layoutViewConstraints]; } - (void)presentationTransitionDidEnd:(BOOL)completed { [super presentationTransitionDidEnd:completed]; } - (void)dismissalTransitionWillBegin { [super dismissalTransitionWillBegin]; } - (void)dismissalTransitionDidEnd:(BOOL)completed { [super dismissalTransitionDidEnd:completed]; if (completed) { [_overlayView removeFromSuperview]; _overlayView = nil; } } - (CGRect)frameOfPresentedViewInContainerView{ return self.presentedView.frame; } - (void)tapOverlayView { [self.presentedViewController dismissViewControllerAnimated:YES completion:^{}]; } @end #pragma mark ---------------------------- SPAlertPresentationController end -------------------------------- #pragma mark ---------------------------- SPAlertAnimation begin -------------------------------- @interface SPAlertAnimation() @property (nonatomic, assign) BOOL presenting; @end @implementation SPAlertAnimation - (instancetype)initWithPresenting:(BOOL)isPresenting { if (self = [super init]) { self.presenting = isPresenting; } return self; } + (instancetype)animationIsPresenting:(BOOL)isPresenting { return [[self alloc] initWithPresenting:isPresenting]; } #pragma mark - UIViewControllerAnimatedTransitioning - (NSTimeInterval)transitionDuration:(nullable id )transitionContext { return 0.25f; } - (void)animateTransition:(id )transitionContext { if (self.presenting) { [self presentAnimationTransition:transitionContext]; } else { [self dismissAnimationTransition:transitionContext]; } } - (void)presentAnimationTransition:(id)transitionContext { SPAlertController *alertController = (SPAlertController *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; CGSize controlViewSize = alertController.view.bounds.size; // 获取presentationController，注意不是presentedController SPAlertPresentationController *presentedController = (SPAlertPresentationController *)alertController.presentationController; UIView *overlayView = presentedController.overlayView; switch (alertController.animationType) { case SPAlertAnimationTypeRaiseUp: [self raiseUpWhenPresentForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeDropDown: [self dropDownWhenPresentForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeAlpha: [self alphaWhenPresentForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeExpand: [self expandWhenPresentForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeShrink: [self shrinkWhenPresentForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; default: break; } } - (void)dismissAnimationTransition:(id)transitionContext { SPAlertController *alertController = (SPAlertController *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; CGSize controlViewSize = alertController.view.bounds.size; // 获取presentationController，注意不是presentedController SPAlertPresentationController *presentedController = (SPAlertPresentationController *)alertController.presentationController; UIView *overlayView = presentedController.overlayView; switch (alertController.animationType) { case SPAlertAnimationTypeRaiseUp: [self dismissCorrespondingRaiseUpForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeDropDown: [self dismissCorrespondingDropDownForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeAlpha: [self dismissCorrespondingAlphaForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeExpand: [self dismissCorrespondingExpandForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; case SPAlertAnimationTypeShrink: [self dismissCorrespondingShrinkForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView]; break; default: break; } } // 从底部忘上弹的present动画 - (void)raiseUpWhenPresentForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = ScreenHeight; alertController.view.frame = controlViewFrame; UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{ CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = ScreenHeight-controlViewSize.height; alertController.view.frame = controlViewFrame; overlayView.alpha = 1.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 从底部往上弹对应的dismiss动画 - (void)dismissCorrespondingRaiseUpForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = ScreenHeight; alertController.view.frame = controlViewFrame; overlayView.alpha = 0.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 从顶部往下弹的present动画 - (void)dropDownWhenPresentForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = -controlViewSize.height; alertController.view.frame = controlViewFrame; UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveEaseOut animations:^{ CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = 0; alertController.view.frame = controlViewFrame; overlayView.alpha = 1.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 从顶部往下弹对应的dismiss动画 - (void)dismissCorrespondingDropDownForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{ CGRect controlViewFrame = alertController.view.frame; controlViewFrame.origin.y = -controlViewSize.height; alertController.view.frame = controlViewFrame; overlayView.alpha = 0.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // alpha值从0到1变化的present动画 - (void)alphaWhenPresentForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { alertController.view.alpha = 0; UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{ alertController.view.alpha = 1.0; overlayView.alpha = 1.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // alpha值从0到1变化对应的的dismiss动画 - (void)dismissCorrespondingAlphaForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{ alertController.view.alpha = 0; overlayView.alpha = 0.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 发散的prensent动画 - (void)expandWhenPresentForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { alertController.view.transform = CGAffineTransformMakeScale(0.5, 0.5); UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 usingSpringWithDamping:0.6 initialSpringVelocity:20 options:UIViewAnimationOptionCurveLinear animations:^{ alertController.view.transform = CGAffineTransformIdentity; overlayView.alpha = 1.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 发散对应的dismiss动画 - (void)dismissCorrespondingExpandForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{ alertController.view.transform = CGAffineTransformMakeScale(0, 0); overlayView.alpha = 0.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 收缩的present动画 - (void)shrinkWhenPresentForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { alertController.view.transform = CGAffineTransformMakeScale(1.1, 1.1); UIView *containerView = [transitionContext containerView]; [containerView addSubview:alertController.view]; [UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0.0 options:UIViewAnimationOptionCurveLinear animations:^{ alertController.view.transform = CGAffineTransformIdentity; overlayView.alpha = 1.0; } completion:^(BOOL finished) { [transitionContext completeTransition:YES]; }]; } // 收缩对应的的dismiss动画 - (void)dismissCorrespondingShrinkForController:(SPAlertController *)alertController transition:(id)transitionContext controlViewSize:(CGSize)controlViewSize overlayView:(UIView *)overlayView { // 与发散对应的dismiss动画相同 [self dismissCorrespondingExpandForController:alertController transition:transitionContext controlViewSize:controlViewSize overlayView:overlayView ]; } @end #pragma mark ---------------------------- SPAlertAnimation end --------------------------------