didReceiveLocalNotification not getting called after using UNUserNotificationCenter

Question

I am scheduling local notifications. It works in iOS 9.x but since iOS 10

-(void)application:(UIApplication *)application didReceiveLocalNotification:(UILocalNotification *)notification

doesn't get called when app is running on iOS 10.

I know that iOS has introduced new UserNotifications framework but that shouldn't stop working iOS 9 APIs.

How can I resolve this issue?

Answer 1

As you know, iOS 10 introduced the UNUserNotifications framework to handle both local and remote notifications. Using this framework, you can set a delegate to detect when a notification is presented or tapped.

[UNUserNotificationCenter currentNotificationCenter].delegate = yourDelegate;

...

// In your delegate ...

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
       willPresentNotification:(UNNotification *)notification
         withCompletionHandler:(void (^)(UNNotificationPresentationOptions))completionHandler {

    // Notification arrived while the app was in foreground

    completionHandler(UNNotificationPresentationOptionAlert);
    // This argument will make the notification appear in foreground
}

- (void)userNotificationCenter:(UNUserNotificationCenter *)center
didReceiveNotificationResponse:(UNNotificationResponse *)response
         withCompletionHandler:(void (^)())completionHandler {

    // Notification was tapped.

    completionHandler();
}

Now, if you still want to use the old (deprecated) application:didReceiveLocalNotification and application:didReceiveRemoteNotification:fetchCompletionHandler, the solution is simple: just don't set any delegate to UNUserNotificationCenter.

Note that silent remote notifications (those which contain the content-available key and no alert, sound, or badge) are always handled by application:didReceiveRemoteNotification:fetchCompletionHandler, even if you have set the delegate.