界面跳转时UINavigationBar的隐藏与显示

透明与半透明 NavigationBar 切换的三种方案

https://www.jianshu.com/p/e3ca1b7b6cec

 

导航栏显示和隐藏的坑 - 简书

https://blog.csdn.net/lipengfei_1993/article/details/77564554

注意：标红的那个参数

- (void)viewWillAppear:(BOOL)animated

{

    [super viewWillAppear:animated];

 

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

}

 

- (void)viewWillDisappear:(BOOL)animated

{

    [super viewWillDisappear:animated];

 

    [self.navigationController setNavigationBarHidden:NO animated:animated];

}