ios-samples/MonoCatalogSample/textview.cs

//
// C# port of the textview sample
//
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Drawing;
using System;

public partial class TextViewController : UIViewController {
	UITextView textView;
	NSObject obs1, obs2;

	public override void ViewDidLoad ()
	{
		base.ViewDidLoad ();

		Title = "Text View";
		textView = new UITextView (View.Frame){
			TextColor = UIColor.Black,
			Font = UIFont.FromName ("Arial", 18f),
			BackgroundColor = UIColor.White,
			Text = "This code brought to you by ECMA 334, ECMA 335 and the Mono Team at Novell\n\n\nEmbrace the CIL!",
			ReturnKeyType = UIReturnKeyType.Default,
			KeyboardType = UIKeyboardType.Default,
			ScrollEnabled = true,
			AutoresizingMask = UIViewAutoresizing.FlexibleHeight,
		};

		// Provide our own save button to dismiss the keyboard
		textView.Started += delegate {
			var saveItem = new UIBarButtonItem (UIBarButtonSystemItem.Done, delegate {
				textView.ResignFirstResponder ();
				NavigationItem.RightBarButtonItem = null;
				});
			NavigationItem.RightBarButtonItem = saveItem;
		};

		View.AddSubview (textView);
	}

	public override void ViewWillAppear (bool animated)
	{
		base.ViewWillAppear (animated);

		obs1 = NSNotificationCenter.DefaultCenter.AddObserver (UIKeyboard.WillShowNotification, delegate (NSNotification n){
			var kbdRect = UIKeyboard.BoundsFromNotification (n);
			var duration = UIKeyboard.AnimationDurationFromNotification (n);
			var frame = View.Frame;
			frame.Height -= kbdRect.Height;
			UIView.BeginAnimations ("ResizeForKeyboard");
			UIView.SetAnimationDuration (duration);
			View.Frame = frame;
			UIView.CommitAnimations ();
			});

		obs2 = NSNotificationCenter.DefaultCenter.AddObserver ("UIKeyboardWillHideNotification", delegate (NSNotification n){
			var kbdRect = UIKeyboard.BoundsFromNotification (n);
			var duration = UIKeyboard.AnimationDurationFromNotification (n);
			var frame = View.Frame;
			frame.Height += kbdRect.Height;
			UIView.BeginAnimations ("ResizeForKeyboard");
			UIView.SetAnimationDuration (duration);
			View.Frame = frame;
			UIView.CommitAnimations ();
		});
	}

	public override void ViewDidDisappear (bool animated)
	{
		base.ViewWillDisappear (animated);
		NSNotificationCenter.DefaultCenter.RemoveObserver (obs1);
		NSNotificationCenter.DefaultCenter.RemoveObserver (obs2);
	}
}