Swift 3 - Local Notification's didReceiveRemoteNotification function not fired

Question

I have managed to schedule a notification and show it to the user when the app is running/not running in the foreground. Now I need to display a ViewController upon the tap of this notification.

I understand that didReceiveRemoteNotification is the function that is called when the user taps on a notification. In my case, This function is never fired.

AppDelegate:

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let center = UNUserNotificationCenter.current()
    center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
            // Enable or disable features based on authorization.
        }

        return true
}

//didReceiveRemoteNotification goes here

The didReceiveRemoteNotification function:

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable : Any]) {
        if ( application.applicationState == UIApplicationState.active)
        {
            print("Active")
            // App is foreground and notification is recieved,
            // Show a alert.
        }
        else if( application.applicationState == UIApplicationState.background)
        {
            print("Background")
            // App is in background and notification is received,
            // You can fetch required data here don't do anything with UI.
        }
        else if( application.applicationState == UIApplicationState.inactive)
        {
            print("Inactive")
            // App came in foreground by used clicking on notification,
            // Use userinfo for redirecting to specific view controller.
        }
}

This is the entire Notification related code in my AppDelegate. Am I missing something?

Answer 1

For UserNotifications framework you need to work with UNUserNotificationCenterDelegate, so implement UNUserNotificationCenterDelegate with AppDelegate and set the delegate in didFinishLaunchingWithOptions method.

func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {

    let center = UNUserNotificationCenter.current()
    center.delegate = self
    center.requestAuthorization(options: [.alert, .sound]) { (granted, error) in
        // Enable or disable features based on authorization.
    }

    return true
}

Now you need to implements userNotificationCenter(_:willPresent:withCompletionHandler:) and userNotificationCenter(_:didReceive:withCompletionHandler:) methods to get notification.

func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {

    //Handle notification
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    // pull out the buried userInfo dictionary
    let userInfo = response.notification.request.content.userInfo

    if let customData = userInfo["customData"] as? String {
        print("Custom data received: \(customData)")

        switch response.actionIdentifier {
        case UNNotificationDefaultActionIdentifier:
            // the user swiped to unlock
            print("Default identifier")

        case "show":
            // the user tapped our "show more info…" button
            print("Show more information…")
            break

        default:
            break
        }
    }

    // you must call the completion handler when you're done
    completionHandler()
}

You can also check this AppCoda tutorial Introduction to User Notifications Framework in iOS 10 for more details.