As of iOS 8, app devs should use UIKit.UIAlertController rather than this class. Extensions may not use this class at all.

The UIKit.UIActionSheet control is a convenient way to allow the application user to choose among alternative actions. The following code and diagram are taken from the "Action Sheets" section of the "iOS Standard Controls" sample.

protected void HandleBtnActionSheetWithOtherButtonsTouchUpInside (object sender, EventArgs e)
{
	actionSheet = new UIActionSheet ("action sheet with other buttons");
	actionSheet.AddButton ("delete");
	actionSheet.AddButton ("cancel");
	actionSheet.AddButton ("a different option!");
	actionSheet.AddButton ("another option");
	actionSheet.DestructiveButtonIndex = 0;
	actionSheet.CancelButtonIndex = 1;
	//actionSheet.FirstOtherButtonIndex = 2;
	actionSheet.Clicked += delegate(object a, UIButtonEventArgs b) {
		Console.WriteLine ("Button " + b.ButtonIndex.ToString () + " clicked");
	};
	actionSheet.ShowInView (View);
	
}
          

The MonoTouch API supports two styles of event notification: the Objective-C style that uses a delegate class or the C# style using event notifications.

The C# style allows the user to add or remove event handlers at runtime by assigning to the events of properties of this class. Event handlers can be anyone of a method, an anonymous methods or a lambda expression. Using the C# style events or properties will override any manual settings to the Objective-C Delegate or WeakDelegate settings.

The Objective-C style requires the user to create a new class derived from UIKit.UIActionSheetDelegate class and assign it to the UIKit.Delegate property. Alternatively, for low-level control, by creating a class derived from Foundation.NSObject which has every entry point properly decorated with an [Export] attribute. The instance of this object can then be assigned to the UIActionSheet.WeakDelegate property.