Simple APNs registration

gistfile1.cs

[Register ("AppDelegate")]
public partial class AppDelegate : ApplicationDelegate
{
	public override bool FinishedLaunching (UIApplication app, NSDictionary options)
	{
		// common logic here 
	  
		SetupPushNotifications (options);
		return true;
	}

	private void SetupPushNotifications (NSDictionary options)
	{
		if (Application.IsIOS8orHigher)
		{
			var apnsSettings = UIUserNotificationSettings.GetSettingsForTypes (
				UIUserNotificationType.Alert | UIUserNotificationType.Badge | UIUserNotificationType.Sound, new NSSet ());
			UIApplication.SharedApplication.RegisterUserNotificationSettings (apnsSettings);
		}
		else
		{
			UIApplication.SharedApplication.RegisterForRemoteNotificationTypes (
				UIRemoteNotificationType.Alert | UIRemoteNotificationType.Badge | UIRemoteNotificationType.Sound);
		}

		if (options != null)
		{
			// TODO handle notification options

			if (options.ContainsKey(UIApplication.LaunchOptionsLocalNotificationKey))
			{
			}

			if (options.ContainsKey(UIApplication.LaunchOptionsRemoteNotificationKey))
			{
				UIApplication.SharedApplication.ApplicationIconBadgeNumber = 0;
			}
		}
	}

	public override void DidRegisterUserNotificationSettings (UIApplication application, UIUserNotificationSettings notificationSettings)
	{
		UIApplication.SharedApplication.RegisterForRemoteNotifications ();
	}

	public override void RegisteredForRemoteNotifications (UIApplication application, NSData deviceToken)
	{
		string token = string.Empty;
		using (var stream = deviceToken.AsStream()) {
			for (int i = 0; i < stream.Length; i++) {
				token += stream.ReadByte ().ToString ("X2");
			}
		}
		
		// Send token to the server
	}

	public override void FailedToRegisterForRemoteNotifications (UIApplication application, NSError error)
	{
		// Usually nothing here
	}

	public override void ReceivedRemoteNotification (UIApplication application, NSDictionary notification)
	{
		// Handle remote notifications, if required
	}
}