sharee.bike-App/SharedBusinessLogic/Model/Message/Message.cs

using System;
using System.Collections.Generic;
using System.Text;
using Android.App;
using Android.Widget;
using Foundation;
using ShareeBike.Model.Message;
using UIKit;

[assembly: Xamarin.Forms.Dependency(typeof(MessageAndroid))]
[assembly: Xamarin.Forms.Dependency(typeof(MessageIOS))]
namespace ShareeBike.Model.Message
{
	public class MessageAndroid : IMessage
	{
		public void LongAlert(string message)
		{
			Toast.MakeText(Application.Context, message, ToastLength.Long).Show();
		}

		public void ShortAlert(string message)
		{
			Toast.MakeText(Application.Context, message, ToastLength.Short).Show();
		}
	}

	public class MessageIOS : IMessage
	{
        const double LONG_DELAY = 3.5;
		const double SHORT_DELAY = 0.75;

		public void LongAlert(string message)
		{
			ShowAlert(message, LONG_DELAY);
		}

		public void ShortAlert(string message)
		{
			ShowAlert(message, SHORT_DELAY);
		}

		void ShowAlert(string message, double seconds)
		{
			var alert = UIAlertController.Create(null, message, UIAlertControllerStyle.Alert);

			var alertDelay = NSTimer.CreateScheduledTimer(seconds, obj =>
			{
				DismissMessage(alert, obj);
			});

			UIApplication.SharedApplication.KeyWindow.RootViewController.PresentViewController(alert, true, null);
		}

		void DismissMessage(UIAlertController alert, NSTimer alertDelay)
		{
			if (alert != null)
			{
				alert.DismissViewController(true, null);
			}

			if (alertDelay != null)
			{
				alertDelay.Dispose();
			}
		}
	}
}