iOS8 自定义UITabBar （使用popToViewCon

tabbar在iOS8 中重叠的情况.就是原本已经移除的UITabBarButton再次出现

既然是动态添加。那么按照apple的一贯作风。一定会调用viewWillAutolayout这个方法

- (void) viewWillLayoutSubviews {
    [super viewWillLayoutSubviews];
  
    
    
    // 删除系统自动生成的UITabBarButton
    
    for (UIView *child in self.tabBar.subviews) {
        
        if ([child isKindOfClass:NSClassFromString(@"UITabBarButton")]) {
            
            [child removeFromSuperview];
            
        }
        
    }
    [super viewWillAppear:animated];
  
    
}

- (void)viewWillAppear:(BOOL)animated

{
    
    // 删除系统自动生成的UITabBarButton
    
    for (UIView *child in self.tabBar.subviews) {
        
        if ([child isKindOfClass:[UIControl class]]) {
            
            [child removeFromSuperview];
            
        }
        
    }
    
    [super viewWillAppear:animated];
    
}