ios 两个状态栏 背景图片不一样 push过去正常显示
返回(pop)回来,当前的背景图变成了push过去的那个导航栏的背景图片.
用图片演示:
1.这是控制器A:

2.设置push过去的控制器B:

3.点击返回后的控制器A:

为什么控制器A的导航栏的背景图片变成了控制器B的?如何修改?

代码奉上:
自定义控制器的所有代码:

#import "LMSNavigationController.h"

@interface LMSNavigationController ()

@end

@implementation LMSNavigationController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.navigationBar setTitleTextAttributes:
  @{NSFontAttributeName:[UIFont systemFontOfSize:16]}];
}


/**
 * 在这个方法中拦截所有push进来的控制器
 */
- (void)pushViewController:(UIViewController *)viewController animated:(BOOL)animated
{
    if (self.childViewControllers.count > 0) {
        // 如果push进来的不是第一个控制器
        UIButton *leftBtn = [UIButton buttonWithType:UIButtonTypeCustom];
        [leftBtn setImage:[UIImage imageNamed:@"nav-back.png"] forState:UIControlStateNormal];
        [leftBtn setImage:[UIImage imageNamed:@"nav-back-hi.png"] forState:UIControlStateHighlighted];
        leftBtn.frame = CGRectMake(0, 0, 30, 30);
        [leftBtn addTarget:self action:@selector(popViewControllerAnimated:) forControlEvents:UIControlEventTouchUpInside];
        viewController.navigationItem.leftBarButtonItem  = [[UIBarButtonItem alloc]initWithCustomView:leftBtn];
        // 隐藏tabbar
        viewController.hidesBottomBarWhenPushed = YES;
    }
    
    //把导航栏底部的横线去掉
    [self.navigationBar setShadowImage:[UIImage new]];
    
    // 这句super的push要放在后面, 让viewController可以覆盖上面设置的leftBarButtonItem
    // 意思是，我们任然可以重新在push控制器的viewDidLoad方法中设置导航栏的leftBarButtonItem，如果设置了就会覆盖在push方法中设置的“返回”按钮，因为 [super push....]会加载push的控制器执行viewDidLoad方法。
    [super pushViewController:viewController animated:animated];
}



- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end

控制器A关键代码:

- (void)viewDidLoad {
    [super viewDidLoad];
    //导航栏透明背景(nav-clearcolor-image是一张透明的图片)
    [self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"nav-clearcolor-image"] forBarMetrics:UIBarMetricsDefault];
    //把导航栏底部的横线去掉
    [self.navigationController.navigationBar setShadowImage:[UIImage new]];
    //不显示文字
    self.navigationItem.title = nil;
}

控制器B关键代码:

- (void)viewDidLoad {
    [super viewDidLoad];
    UILabel *titleLabel = [[UILabel alloc]init];
    titleLabel.text = @"push过来的控制器";
    titleLabel.textColor = TitleTextColor;
    [titleLabel sizeToFit];
    self.navigationItem.titleView = titleLabel;
}