public static class AccessibilityExtensions
    {
        static Selector selAccessibilityLabel = new Selector("accessibilityLabel");
        static Selector selSetAccessibilityLabel = new Selector("setAccessibilityLabel:");

        public static string GetAccessibilityLabel(this UIView obj)
        {
            if (obj == null)
                throw new ArgumentNullException("obj");

            if (obj.RespondsToSelector(selAccessibilityLabel))
                return new NSString(Messaging.IntPtr_objc_msgSend(obj.Handle, selAccessibilityLabel.Handle));
            else
                return null;
        }

        public static void SetAccessibilityLabel(this UIView obj, string text)
        {
            if (obj == null)
                throw new ArgumentNullException("obj");

            if (obj.RespondsToSelector(selSetAccessibilityLabel))
                Messaging.void_objc_msgSend_intptr(obj.Handle, selSetAccessibilityLabel.Handle,
                    new NSString(text).Handle);
        }
    }