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無法正常工作。

當用戶打開我的應用程序時，將顯示選項卡欄控制器。

- (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");
}

在我的loginView中，

-(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");
}

然后在此處添加另一個日志：

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

因此，您可以先檢查一下。 然后參考@Sandeep Kumar評論:)） NSNotificationCenter在彈出視圖中不起作用（ios objC）