ToastView.cs

// https://gist.github.com/davidroth/1106927
// Licence: MIT X11
// Note: This is an Objective-C to C# translation by using code from: http://code.google.com/p/toast-notifications-ios/
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Drawing;
using MonoTouch.ObjCRuntime;
using System;


namespace RouteBoostiPhone.Controls
{
    public class ToastView : NSObject
    {
        ToastSettings theSettings = new ToastSettings ();

        private string text = null;
        private UIView view;
        private int offsetLeft = 0;
        private int offsetTop = 0;

        public ToastView (string Text, int durationMilliseonds)
        {
            text = Text;
            theSettings.Duration = durationMilliseonds;
        }

        public ToastView SetGravity (ToastGravity gravity, int OffSetLeft, int OffSetTop)
        {
            theSettings.Gravity = gravity;
            offsetLeft = OffSetLeft;
            offsetTop = OffSetTop;
            return this;
        }

        public ToastView SetPosition (PointF Position)
        {
            theSettings.Position = Position;
            return this;
        }

        public void Show ()
        {
            UIButton v = UIButton.FromType (UIButtonType.Custom);
            view = v;

            UIFont font = UIFont.SystemFontOfSize (16);
            int lineCount = Math.Min(7, text.Split('\n').Length + 1);
            SizeF textSize = view.StringSize (text, font, new SizeF (280, 30 * lineCount));

            UILabel label = new UILabel (new RectangleF (0, 0, textSize.Width + 5, textSize.Height + 5));
            label.BackgroundColor = UIColor.Clear;
            label.TextColor = UIColor.White;
            label.Font = font;
            label.Text = text;
            label.Lines = 0;
            label.ShadowColor = UIColor.DarkGray;
            label.ShadowOffset = new SizeF (1, 1);


            v.Frame = new RectangleF (0, 0, textSize.Width + 10, textSize.Height + 10);
            label.Center = new PointF (v.Frame.Size.Width / 2, v.Frame.Height / 2);
            v.AddSubview (label);

            v.BackgroundColor = UIColor.FromRGBA (0, 0, 0, 0.7f);
            v.Layer.CornerRadius = 5;

            UIWindow window = UIApplication.SharedApplication.Windows[0];

            PointF point;

            if (theSettings.Gravity == ToastGravity.Top)
            {
                point = new PointF (window.Frame.Size.Width / 2, (textSize.Height/2) + 35);
            }
            else if (theSettings.Gravity == ToastGravity.Bottom)
            {
                point = new PointF (window.Frame.Size.Width / 2, window.Frame.Size.Height - (textSize.Height/2) - 35);
            }
            else if (theSettings.Gravity == ToastGravity.Center)
            {
                point = new PointF (window.Frame.Size.Width / 2, window.Frame.Size.Height / 2);
            }
            else
            {
                point = theSettings.Position;
            }

            point = new PointF (point.X + offsetLeft, point.Y + offsetTop);
            v.Center = point;
            window.AddSubview (v);
            v.AllTouchEvents += delegate { HideToast (null); };

            NSTimer.CreateScheduledTimer (theSettings.DurationSeconds, this, new Selector ("HideToast"), null, false);

        }

        [ExportAttribute("HideToast")]
        void HideToast (NSTimer timer)
        {
            UIView.BeginAnimations ("");
            view.Alpha = 0;
            UIView.CommitAnimations ();
            RemoveToast();
        }

        void RemoveToast ()
        {
            view.RemoveFromSuperview ();
        }
    }

    public enum ToastGravity
    {
        Top = 0,
        Bottom = 1,
        Center = 2
    }

    public class ToastSettings
    {
        public ToastSettings ()
        {
            this.Duration = 500;
            this.Gravity = ToastGravity.Center;
        }

        public int Duration
        {
            get;
            set;
        }

        public double DurationSeconds
        {
            get { return (double) Duration/1000 ;}

        }

        public ToastGravity Gravity
        {
            get;
            set;
        }

        public PointF Position
        {
            get;
            set;
        }
    }
}