Parse Push on Xamarin iOS

AppDelegate.cs

using System;
using System.Collections.Generic;
using System.Linq;
using Foundation;
using Parse;
using UIKit;

namespace x2coder.iOS
{
    [Register("AppDelegate")]
    public partial class AppDelegate : global::Xamarin.Forms.Platform.iOS.FormsApplicationDelegate
    {
        public override bool FinishedLaunching(UIApplication app, NSDictionary options)
        {
			if (UIDevice.CurrentDevice.CheckSystemVersion(8, 0))
			{
				var pushSettings = UIUserNotificationSettings.GetSettingsForTypes(
								   UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound,
								   new NSSet());

				UIApplication.SharedApplication.RegisterUserNotificationSettings(pushSettings);
				UIApplication.SharedApplication.RegisterForRemoteNotifications();
			}
			else
			{
				UIRemoteNotificationType notificationTypes = UIRemoteNotificationType.Alert | UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound;
				UIApplication.SharedApplication.RegisterForRemoteNotificationTypes(notificationTypes);
			}


			global::Xamarin.Forms.Forms.Init();

            LoadApplication(new App());

            return base.FinishedLaunching(app, options);
        }


		public override void RegisteredForRemoteNotifications(UIApplication application, NSData deviceToken)
		{


			ParseObject obj = ParseObject.Create("_Installation");
			string dt = deviceToken.ToString().Replace("<", "").Replace(">", "").Replace(" ", "");
			obj["deviceToken"] = dt;
			obj.SaveAsync().ContinueWith(t => {
				if (t.IsFaulted)
				{
					using (IEnumerator<System.Exception> enumerator = t.Exception.InnerExceptions.GetEnumerator())
					{
						if (enumerator.MoveNext())
						{
							ParseException error = (ParseException)enumerator.Current;
							Console.WriteLine("ERROR!!!: " + error.Message);
						}
					}
				}
				else
				{
					//Console.WriteLine("Saved/Retrieved Installation");
					var data = NSUserDefaults.StandardUserDefaults;
					data.SetString("currentInstallation", obj.ObjectId);
					//Console.WriteLine("Installation ID = " + obj.ObjectId);
				}
			});

		}

		public override void FailedToRegisterForRemoteNotifications(UIApplication application, NSError error)
		{
			new UIAlertView("Error registering push notifications", error.LocalizedDescription, null, "OK", null).Show();
		}
    }
}