关于导航条navigationBar消失的问题

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    UIBarButtonItem * backButton=[[UIBarButtonItem alloc]init];
    backButton.title=@"戻る";
    self.navigationItem.backBarButtonItem=backButton;
    
	// Do any additional setup after loading the view
}



-(void)viewWillAppear:(BOOL)animated
{
    
    [self.navigationController setNavigationBarHidden:YES animated:NO];//设置成yes即可
}

手势往右拖动一半松开后

修改

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