UIImage extension to get a pixel color for Xamarin iOS

UIImageExtensions.cs

using System.Drawing;
using System.Runtime.InteropServices;
using CoreGraphics;
using UIKit;

namespace iOS
{
    public static class UIImageExtensions
    {
		public static string GetPixelHexColor(this UIImage image, float x, float y)
		{
			string hexCode = null;

			var point = new PointF(x, y);

			var rawData = new byte[4];
			var handle = GCHandle.Alloc(rawData);

			try
			{
				using (var colorSpace = CGColorSpace.CreateGenericRgb())
				{
					using (var context = new CGBitmapContext(rawData, 1, 1, 8, 4, colorSpace, CGImageAlphaInfo.PremultipliedLast))
					{
						context.DrawImage(new RectangleF(-point.X, point.Y - (float)image.Size.Height, (float)image.Size.Width, (float)image.Size.Height), image.CGImage);

						hexCode = string.Format("#{0}{1}{2}{3}", rawData[3].ToString("X2"), rawData[0].ToString("X2"), rawData[1].ToString("X2"), rawData[2].ToString("X2"));
					}
				}
			}
			finally
			{
				handle.Free();
			}

			return hexCode;
		}
    }
}