NSNotificationCenter 在弹出视图中不起作用（ios objC）

Question

我正在做一个 iPad 项目（xcode 7.21+iOS9）但 NSNotificationCenter 不工作。

当用户打开我的应用程序时，将出现标签栏控制器。

- (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");
}

在我的登录视图中，

-(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");
}

然后在这里添加另一个日志:

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

所以你可以先看看调用了什么。然后参考@Sandeep Kumar 评论:)）

NSNotificationCenter 在弹出视图中不起作用（ios objC）

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