iphone - 对 的开始/结束外观转换的调用不平衡

Question

当我初始化 UITabBarController 时，每个选项卡都包含 UINavigationController 并且每个 UINavigationController 都包含 UIViewController当在 UIViewController 中时，我会做类似的事情

TSActivityDetailsVC * c = [[TSActivityDetailsVC alloc] initWithNibName:@"TSActivityDetailsVC" bundle:nil];
[self.navigationController pushViewController:c animated:YES];

我有动画，但是当我按下后退按钮时 - 我没有动画并出现错误

日志:

push view controller
Unbalanced calls to begin/end appearance transitions for <TSActivityMapVC: 0x81b1000>.
back btn pressed
Unbalanced calls to begin/end appearance transitions for <TSActivityDetailsVC: 0x81c85d0>.

初始化代码:

-(UITabBarController *) createMainTabBarController{
UITabBarController * tabbarCntr = [[UITabBarController alloc] init];
[tabbarCntr setViewControllers:[NSArray arrayWithObjects:
                                [[UINavigationController alloc] initWithRootViewController:[[TSActivityMapVC alloc] init]],                                    
                                [[UIViewController alloc] init],
                                [[UIViewController alloc] init],
                                [[UIViewController alloc] init],
                                [[UIViewController alloc] init]
                                , nil]];
[tabbarCntr.tabBar setSelectionIndicatorImage:[UIImage imageNamed:@"selection_indicator"]];
[tabbarCntr.tabBar setBackgroundImage:[UIImage imageNamed:@"tabbar_background"]];    

return tabbarCntr; 
}

在 TSActivityMapVC 我执行

TSActivityDetailsVC * c = [[TSActivityDetailsVC alloc] initWithNibName:@"TSActivityDetailsVC" bundle:nil]; 
[self.navigationController pushViewController:c animated:YES];

令人惊讶的是，当我转到另一个选项卡并返回时 - 在它之后 - 一切正常，没有错误

Answer 1

我得到了解决方案!我将 UITabBarController 子类化并忘记调用 viewWillAppear 的 super。所以 UITabBarController 的过渡动画没有完成。

这导致了“不平衡调用开始/结束出现”!