public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
 {
     AzurePushNotificationManager.RemoteNotificationRegistrationFailed(error);
 }
 // To receive notifications in foreground on iOS 9 and below.
 // To receive notifications in background in any iOS version
 public override void DidReceiveRemoteNotification(UIApplication application, NSDictionary userInfo, Action <UIBackgroundFetchResult> completionHandler)
 {
     AzurePushNotificationManager.DidReceiveMessage(userInfo);
 }
 public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
 {
     AzurePushNotificationManager.DidRegisterRemoteNotifications(deviceToken);
 }