Get notified when user takes screenshot on Xamarin.iOS

AppDelegate.cs

using Foundation;
using UIKit;

namespace YourApp
{
	[Register ("AppDelegate")]
	public partial class AppDelegate : UIApplicationDelegate
	{
		NSObject _screenshotNotification = null;

		public override void OnActivated (UIApplication application)
		{
			try {
				// Start observing screenshot notification
				if (_screenshotNotification == null) {
					_screenshotNotification = NSNotificationCenter.DefaultCenter.AddObserver (UIApplication.UserDidTakeScreenshotNotification,
								(NSNotification n) => {

							Console.WriteLine("UserDidTakeScreenshotNotification");
								
							n.Dispose ();
						}
					);
				}
			} catch (Exception ex) {
				//Do something
			}
		}

		public override void OnResignActivation (UIApplication application)
		{
			try {
				// Stop observer
				if (_screenshotNotification != null) {
					NSNotificationCenter.DefaultCenter.RemoveObserver (_screenshotNotification);
					_screenshotNotification.Dispose ();
					_screenshotNotification = null;
				}
			} catch (Exception ex) {
				//Do something
			}
		}
	}
}