jixin_new/shiku_im/ClassesNew/MainClass/MJTabBar.m

//
//  XMGTabBar.m
//  备课-百思不得姐
//
//  Created by MJ Lee on 15/6/15.
//  Copyright © 2015年 小码哥. All rights reserved.
//

#import "MJTabBar.h"
#import "Masonry.h"
#import "UIView+LK.h"
@interface MJTabBar()

@property (nonatomic,strong) NSMutableArray *tabBarButtonArray;

@property (nonatomic,weak) UIButton *publishButton;
@end
 

@implementation MJTabBar

- (nonnull instancetype)initWithFrame:(CGRect)frame
{
    if (self = [super initWithFrame:frame]) {
        
        _tabBarButtonArray=[NSMutableArray array];
        
 
        
        
        UIButton *publishButton = [[UIButton alloc] init];
        [publishButton setTitle:@"福利" forState:UIControlStateNormal];
        [publishButton setTitleColor:[UIColor grayColor] forState:UIControlStateHighlighted];
        [publishButton setTitleColor:[UIColor blackColor] forState:UIControlStateHighlighted];
        [self addSubview:publishButton];
        self.publishButton=publishButton;
        publishButton.backgroundColor=[UIColor greenColor];
        [publishButton mas_makeConstraints:^(MASConstraintMaker *make) {
             make.center.equalTo(self);
            make.size.mas_equalTo(CGSizeMake(JX_SCREEN_WIDTH/3, JX_SCREEN_HEIGHT>=812?64:49));
        }];
        [publishButton addTarget:self action:@selector(publishClick) forControlEvents:UIControlEventTouchUpInside];
 
    
    
    
    
    
    
    }
    return self;
}

- (void)publishClick
{
  
}

- (void)layoutSubviews
{
    [super layoutSubviews];
    
    // 把 tabBarButton 取出来（把 tabBar 的 subViews 打印出来就明白了）
       NSMutableArray *tabBarButtonArray = [NSMutableArray array];
       for (UIView *view in self.subviews) {
           if ([view isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
                [tabBarButtonArray addObject:view];
               
               [view removeFromSuperview];
           }
       }
       
       CGFloat barWidth = self.bounds.size.width;
       CGFloat barHeight = self.bounds.size.height;
       CGFloat centerBtnWidth = CGRectGetWidth(self.publishButton.frame);
       CGFloat centerBtnHeight = CGRectGetHeight(self.publishButton.frame);
       // 设置中间按钮的位置，居中，凸起一丢丢
       self.publishButton.center = CGPointMake(barWidth / 2, barHeight - centerBtnHeight/2 - 5);
       // 重新布局其他 tabBarItem
       // 平均分配其他 tabBarItem 的宽度
       CGFloat barItemWidth = (barWidth - centerBtnWidth) / tabBarButtonArray.count;
       // 逐个布局 tabBarItem，修改 UITabBarButton 的 frame
       [tabBarButtonArray enumerateObjectsUsingBlock:^(UIView *  _Nonnull view, NSUInteger idx, BOOL * _Nonnull stop) {
           
           CGRect frame = view.frame;
           if (idx >= tabBarButtonArray.count / 2) {
               // 重新设置 x 坐标，如果排在中间按钮的右边需要加上中间按钮的宽度
               frame.origin.x = idx * barItemWidth + centerBtnWidth;
           } else {
               frame.origin.x = idx * barItemWidth;
           }
           // 重新设置宽度
           frame.size.width = barItemWidth;
           view.frame = frame;
       }];
       // 把中间按钮带到视图最前面
       [self bringSubviewToFront:self.publishButton];
}

@end