NavigationBar

导航栏的显隐(默认是NO)

self.navigationController.navigationBar.hidden = YES;

//UINavigationController.h
self.navigationController.navigationBarHidden = YES;

//隐藏或显示导航栏。如果动画,它将使用UINavigationControllerHideShowBarDuration垂直过渡。

[self.navigationController setNavigationBarHidden:YES animated:YES];

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