隐藏NavigationBar的正确方式

 

- (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];

}