Correct way to retrieve token for FCM - iOS 10 Swift 3

Question

i had implement Firebase with FirebaseAuth/FCM etc and did sent notification successfully through Firebase Console.

However i would need to push the notification from m

Answer 1

I was having the same problem, but could not figure out what was going on.

The didRegisterForRemoteNotificationsWithDeviceToken suggested by @Sam is called (almost) every time, so it is a good work around. BUT, it is NOT called the first time you open the app with the refreshed token.

So for this scenario you still need the:

func messaging(_ messaging: Messaging, didRefreshRegistrationToken fcmToken: String) {
    print("Refreshed Token: \(fcmToken)")
}

So if you only use the:

func application(_ application: UIApplication, didRegisterForRemoteNotificationsWithDeviceToken deviceToken: Data) {
    if let fcmToken = InstanceID.instanceID().token() {
        print("InstanceID token: \(fcmToken)")
    }
}

You will only get the "refreshed token" the second time the user opens the app.

I managed to force a refresh token by uninstalling the app and cleaning the Build Folder (Product > Clean Build Folder). Good for testing.

Ideally it could all be handled at messaging:didReceiveRegistrationToken delegate method, but I was not able to make it work. Another way to get notified for changes in the FCM token is to listen NSNotification named kFIRMessagingRegistrationTokenRefreshNotification as suggested in the documentation: https://firebase.google.com/docs/cloud-messaging/ios/client