arkan · June 24, 2013 08:14 · May 9, 2012
diff --git a/MailViewTestViewController.cs b/MailViewTestViewController.cs
@@ -0,0 +1,97 @@
+using System;
+using System.Drawing;
+using System.IO;
+using System.Net;
+using MonoTouch.Foundation;
+using MonoTouch.UIKit;
+
+// A MonoTouch iOS Mail like example with a custom view and a UIWebView :
+//
+// http://stackoverflow.com/questions/10434444/zoom-a-uiwebview-like-ios-mail-app/10463431
+//
+// andywhitt[at]gmail.com
+
+namespace MailViewTest
+{	
+	public partial class MailViewTestViewController : UIViewController
+	{
+		UILabel customView; // customview, in this example its just a UILabel
+
+		UIView fakeBackgroundView = new UIView();
+
+		private bool _loaded;
+
+		public MailViewTestViewController () : base ("MailViewTestViewController", null)
+		{
+		}
+
+		public override void ViewDidLoad ()
+		{
+			base.ViewDidLoad ();
+			customView = new UILabel (new RectangleF (0, 0, View.Frame.Width, 50)) { Text = "Testing Text" };
+			webView.BackgroundColor = UIColor.ScrollViewTexturedBackgroundColor;
+			webView.LoadFinished += HandleWebViewLoadFinished;
+			webView.ScalesPageToFit = true;
+
+			// grab some html
+			var request = WebRequest.Create ("http://www.stackoverflow.com");
+			var response = request.GetResponse (); 
+			var reader = new StreamReader (response.GetResponseStream ());
+
+			// HACK : add ViewPort meta tag so that if the page is smaller than the View it will zoom correctly
+			var str = "<meta name=\"viewport\" content=\"width=320\"/>" + reader.ReadToEnd ();
+			webView.LoadHtmlString (str, null);			
+			webView.ScrollView.WeakDelegate = this;
+			webView.ScrollView.AddSubview (customView);
+
+			// remove the webviews shadow and update all others subviews Y
+			foreach (var subview in webView.ScrollView.Subviews) {
+				if (subview == customView)
+					continue;
+				else if (subview is UIImageView) // remove shadow
+					subview.Hidden = true;
+				else
+					subview.Frame = new RectangleF (new PointF (subview.Frame.X, subview.Frame.Y + customView.Frame.Height), subview.Frame.Size);
+			}
+		}
+
+		[Export("scrollViewDidScroll:")]
+		private void HandleWebViewScrollViewScrolled (UIScrollView scrollView)
+		{	
+			float x = 0;
+		    if(scrollView.ContentOffset.X < 0)
+		    	x = 0;
+			else if((scrollView.ContentOffset.X + customView.Frame.Size.Width) > scrollView.ContentSize.Width)
+		        x = scrollView.ContentSize.Width - customView.Frame.Size.Width;
+		    else
+		        x = scrollView.ContentOffset.X;
+			customView.Frame = new RectangleF(new PointF(x, customView.Frame.Y), customView.Frame.Size);
+		}
+
+		private void HandleWebViewLoadFinished (object sender, EventArgs e)
+		{
+			if (_loaded)
+				return;
+
+			// add the fake white background so it looks like Mail
+			fakeBackgroundView.BackgroundColor = UIColor.White;
+			fakeBackgroundView.Frame = new RectangleF (new PointF (0, 0), webView.ScrollView.ContentSize);
+			webView.ScrollView.AddSubview (fakeBackgroundView);
+			webView.ScrollView.SendSubviewToBack (fakeBackgroundView);
+
+			_loaded = true;
+		}
+
+		public override void DidRotate (UIInterfaceOrientation fromInterfaceOrientation)
+		{
+			// update the fakebackground frame
+			fakeBackgroundView.Frame = new RectangleF (new PointF (0, 0), webView.ScrollView.ContentSize);
+		}
+
+		public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
+		{
+			// Return true for supported orientations
+			return (toInterfaceOrientation != UIInterfaceOrientation.PortraitUpsideDown);
+		}
+	}
+}