topBar是UINavigationController的一部分，而不是UITabBarController的一部分，您可以通过将以下内容放在viewWillAppear方法中来隐藏它:

The topBar is part of the UINavigationController not the UITabBarController, you can hide it by putting the following in your viewWillAppear method:

self.navigationController.navigationBarHidden = YES;

但是我很确定NavigationBar始终在顶部，因此我认为您要隐藏的栏实际上是您自己的工具栏.

But I'm pretty sure the navigationBar is always on top, so I think the bar you want to hide is actually your own toolbar.

self.myToolBar.hidden = YES;