NSNotificationCenter在彈出視圖中不起作用（ios objC）

Question

我正在開發一個iPad項目（xcode 7.21 + iOS9），並且NSNotificationCenter不起作用。

當用戶打開我的應用程序時，標籤欄控制器將出現。

- (void)viewWillAppear:(BOOL)animated { 
    if (false == [[MyClass sharedData] getLoginStatus]) 
    { 
     LoginViewController *loginViewController = [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"myCustomPopoverLoginVC"]; 
      loginViewController.modalPresentationStyle = UIModalPresentationFormSheet; 
      [self presentViewController:loginViewController animated:YES completion:^{ 

     }]; 
... 
    } 
} 

- (void)viewDidLoad 
{ 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notificationLogin:) name:@"afterLogin" object:nil]; 
    [super viewDidLoad]; 
... 
} 

-(void)notificationLogin:(NSNotification *)notification{ 
    NSLog(@"OhOhOh"); 
} 

在我loginView，

-(IBAction)login:(id)sender{ 
    ... 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"afterLogin" object:nil]; 
    ... 
} 

Answer 1

首先：

- (void)viewWillAppear:(BOOL)animated { 
    if (false == [[MyClass sharedData] getLoginStatus]) 
    { 
     LoginViewController *loginViewController = [[UIStoryboard storyboardWithName:@"MainStoryboard" bundle:nil] instantiateViewControllerWithIdentifier:@"myCustomPopoverLoginVC"]; 
      loginViewController.modalPresentationStyle = UIModalPresentationFormSheet; 
      [self presentViewController:loginViewController animated:YES completion:^{ 

     }]; 
... 
    } 
} 

- (void)viewDidLoad 
{ 
    // Add log here to check when its called 
    -------> NSLog("Add Observer"); 
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(notificationLogin:) name:@"afterLogin" object:nil]; 
    [super viewDidLoad]; 
... 
} 

-(void)notificationLogin:(NSNotification *)notification{ 
    NSLog(@"OhOhOh"); 
} 

然後在這裏添加另一個日誌：

-(IBAction)login:(id)sender{ 
    ... 
    -------> NSLog("Post notification"); 
    [[NSNotificationCenter defaultCenter] postNotificationName:@"afterLogin" object:nil]; 
    ... 
} 

所以，你可以查閱一下所謂的第一。然後參考@Sandeep庫馬爾評論:)） NSNotificationCenter doesn't work in popup view(ios objC)