自定义TabBar时，pop到指定控制器后Tabbar重复问题的

在新建的UINavigationController 控制器中遵循UINavigationControllerDelegate,并实现其代理方法，具体如下:

1、设置代理:

- (void)viewDidLoad {
    [super viewDidLoad];
    self.delegate  = self;
    // Do any additional setup after loading the view.
    
}

2、实现代理方法：

#pragma  -- UINavigationControllerDelegate
//解决pop到指定控制器tabBar重复的问题
- (void)navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated{
    for (UIView *tabBarView in self.tabBarController.tabBar.subviews) {
        if ([tabBarView isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            [tabBarView removeFromSuperview];
        }
    }
}```