DoubleTap.cs

public override void TouchesBegan(NSSet touches, UIEvent evt)
{
	var touch = touches.AnyObject as UITouch;
	Console.Out.WriteLine("TouchesBegan:" + touch.TapCount);
	if (touch.TapCount == 2) 
	{
		Console.Out.WriteLine("TouchesBegan:SingleTap Cancel");
		//シングルタップ時の処理キャンセル
			
	}
}

public override void TouchesMoved(NSSet touches, UIEvent evt)
{
	Console.Out.WriteLine("TouchesMoved");
}

public override void TouchesEnded(NSSet touches, UIEvent evt)
{
	var touch = touches.AnyObject as UITouch;
	Console.Out.WriteLine("TouchesEnded:" + touch.TapCount);
	
	if (touch.TapCount == 1) 
	{
		Console.Out.WriteLine("TouchesEnded:SingleTap");
		this.PerformSelector(stAction, this, 5000);
	}
	else if ( touch.TapCount == 2 )
	{
		Console.Out.WriteLine("TouchesEnded:DoubleTap");
	}
}

gistfile2.txt

UIViewControllerを継承したサブクラスでTouchイベントをOverRide