jixin_new/shiku_im/ClassesNew/MainClass/XMGOpenGLNavVc.m

//
//  XMGOpenGLNavVc.m
//  XMGOpenGLDrawPanel
//
//  Created by wei zeng on 2019/5/7.
//  Copyright © 2019 wei zeng. All rights reserved.
//

#import "XMGOpenGLNavVc.h"

@interface XMGOpenGLNavVc ()<UINavigationControllerDelegate>

@end

@implementation XMGOpenGLNavVc

+ (void)initialize{
    
        UIImage *bg = [UIImage imageNamed:@"navigationbarBackgroundWhite8"];
         UINavigationBar *bar = [UINavigationBar appearance];
        [bar setTintColor:[UIColor whiteColor]];
        [bar setBackgroundImage:bg forBarMetrics:UIBarMetricsDefault];
        [bar setBackgroundColor:[UIColor whiteColor]];
        [bar setTitleTextAttributes:@{NSFontAttributeName : [UIFont systemFontOfSize:15 weight:UIFontWeightRegular]}];
   
    UIFont *font = [UIFont systemFontOfSize:15 weight:UIFontWeightRegular];
    NSDictionary *textAttributes = @{
                                     NSFontAttributeName : font,
                                     NSForegroundColorAttributeName : [UIColor blackColor]
                                     };
    [[UINavigationBar appearance] setTitleTextAttributes:textAttributes];
    [[UINavigationBar appearance] setTintColor:[UIColor blackColor]];
    [[UINavigationBar appearance]  setBarTintColor:kRGBColor(255, 255, 255)];
    
    
}

-(void)viewDidLoad{
    [super viewDidLoad];
}
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
    {
        if (self.childViewControllers.count) {
            viewController.hidesBottomBarWhenPushed = YES;
            UIButton *button = [[UIButton alloc] init];
            [button setImage:[UIImage imageNamed:@"navigationButtonReturn"] forState:UIControlStateNormal];
            [button setImage:[UIImage imageNamed:@"navigationButtonReturnClick"] forState:UIControlStateHighlighted];
            button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentLeft;
            //[button setTitle:@"返回" forState:UIControlStateNormal];
            [button setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
            [button setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];
            [button addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
            button.bounds = CGRectMake(0, 0, 30, 44);
            //[button sizeToFit];
            //button.contentEdgeInsets = UIEdgeInsetsMake(0, -5, 0, 0);
            button.titleLabel.font = [UIFont systemFontOfSize:15];
            viewController.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:button];
        }
      
        [[NSNotificationCenter defaultCenter] postNotificationName:@"hidddenBottomView" object:nil userInfo:@{@"jxmessage":@"1",@"my":@"1",@"gif":@"1"}];
      

           // [[NSNotificationCenter defaultCenter] postNotificationName:@"hidddenShowBottomView" object:nil];
        
        viewController.hidesBottomBarWhenPushed=YES;
        [super pushViewController:viewController animated:animated];
        
        
        NSLog(@"aaaa %zd",self.childViewControllers.count);
    
    }
-(void)back{ 
    [self popViewControllerAnimated:YES];
}
- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{
    // 手势何时有效 : 当导航控制器的子控制器个数 > 1就有效
    return self.childViewControllers.count > 1;
}
@end