ios 系统NavigationBar隐藏

FirstViewController  pushViewController到第二个页面 SecondViewController

在FirstViewController中设置

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
   
    self.navigationController.navigationItem.title = nil;
    self.navigationController.navigationItem.leftBarButtonItem = nil;
 
    
}

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //设置navigation显示状态
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    
    self.navigationController.navigationBar.alpha = 0;
    
}

-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    
    [self.navigationController setNavigationBarHidden:NO animated:animated];
    self.navigationController.navigationBar.alpha = 1;
    
}

同理在SecondViewController中也设置成这样

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
   
    self.navigationController.navigationItem.leftBarButtonItem = nil;
    self.navigationController.navigationItem.title = nil;
    
}

-(void)viewWillAppear:(BOOL)animated{
    [super viewWillAppear:animated];
    //隐藏掉系统的navigationBar
    [self.navigationController setNavigationBarHidden:YES animated:animated];
    self.navigationController.navigationBar.alpha = 0;
}

-(void)viewWillDisappear:(BOOL)animated{
    [super viewWillDisappear:animated];
    
//    //显示系统的navigationBar
    [self.navigationController setNavigationBarHidden:NO animated:animated];
    self.navigationController.navigationBar.alpha = 1;
    
}