Display an Alert popup when application is receiving an Apple Push Notification in iOS

Question

I am creating a Chat kind of iPhone application using Apple push notification services. APN's is working fine and i am getting notification when user is receiving new message. So, i have set one Toast pop up in didReceiveRemoteNotification of my App Delegate class. The problem is, i am getting Toast pop up in every View Controller screen because i have added Toast on my main window itself. but can you please help me that how can i hide this Toast pop up from one of my Chat List View Controller screen. How can i check which View Controller is loaded currently on my window view, when application is in foreground?

here is my code :

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
{
    if ( application.applicationState == UIApplicationStateActive ){

        NSString  *personName = [[userInfo valueForKey:@"aps"] valueForKey:@"user_name"];
        NSString *meassge = [NSString stringWithFormat:@"New message from %@.", personName];

        [[self window] makeToast:meassge duration:1.0 position:@"center"];


        [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTheTable" object:nil];
    } 

    [[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
    [[UIApplication sharedApplication] cancelAllLocalNotifications];
}

Thanks!

Answer 1

Declare below methods in AppDelegate.m

  - (UIViewController*)topViewController {
     return [self topViewControllerWithRootViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
}

- (UIViewController*)topViewControllerWithRootViewController:(UIViewController*)rootViewController {
     if ([rootViewController isKindOfClass:[UITabBarController class]]) {
        UITabBarController* tabBarController = (UITabBarController*)rootViewController;
        return [self topViewControllerWithRootViewController:tabBarController.selectedViewController];
     } else if ([rootViewController isKindOfClass:[UINavigationController class]]) {
     UINavigationController* navigationController = (UINavigationController*)rootViewController;
     return [self topViewControllerWithRootViewController:navigationController.visibleViewController];
     } else if (rootViewController.presentedViewController) {
    UIViewController* presentedViewController = rootViewController.presentedViewController;
    return [self topViewControllerWithRootViewController:presentedViewController];
    } else {
    return rootViewController;
    }
  }

- (void)application:(UIApplication*)application didReceiveRemoteNotification:(NSDictionary*)userInfo
 {
  if ( application.applicationState == UIApplicationStateActive ){

    NSString  *personName = [[userInfo valueForKey:@"aps"] valueForKey:@"user_name"];
    NSString *meassge = [NSString stringWithFormat:@"New message from %@.", personName];
    if(![[self topViewController] isKindOfClass:[ChatListViewController class]])//ChatListViewController is your viewcontroller
        [[self window] makeToast:meassge duration:1.0 position:@"center"];


    [[NSNotificationCenter defaultCenter] postNotificationName:@"reloadTheTable" object:nil];
  } 

[[UIApplication sharedApplication] setApplicationIconBadgeNumber:0];
[[UIApplication sharedApplication] cancelAllLocalNotifications];

}