gistfile1.txt

using System;

using AppKit;
using Foundation;
using MediaLibrary;

namespace HttpTest
{
	public partial class ViewController : NSViewController
	{
		public ViewController (IntPtr handle) : base (handle)
		{
		}

		MLMediaLibrary mediaLibrary;
		NSTextField textView;

		public override void ViewDidLoad ()
		{
			base.ViewDidLoad ();

			textView = new NSTextField (View.Frame) { BackgroundColor = NSColor.Yellow, StringValue = "More info coming..." };
			View.AddSubview (textView);

			mediaLibrary = new MLMediaLibrary (NSDictionary<NSString, NSObject>.FromObjectsAndKeys
			(
				new NSObject[] { NSNumber.FromUInt64 ((ulong)MLMediaSourceType.Image) },
				new NSString[] { MLMediaLibrary.MediaLoadSourceTypesKey }
			));

			var mediaSources = mediaLibrary.MediaSources;
			if (mediaSources != null)
				HandleMediaSource (mediaSources);
			else
				mediaLibrary.AddObserver ("mediaSources", 0, c => HandleMediaSource (mediaLibrary.MediaSources));
		}

		void HandleMediaSource (NSDictionary<NSString, MLMediaSource> mediaSources)
		{
			MLMediaSource iTunesSource;
			var success = mediaLibrary.MediaSources.TryGetValue (MLMediaSource.MediaSourcePhotosIdentifier, out iTunesSource);

			if (success) {
				MLMediaGroup grp = iTunesSource.RootMediaGroup;
				if (grp != null)
					HandleGroup (grp);
				else
					iTunesSource.AddObserver ("rootMediaGroup", 0, c => HandleGroup (iTunesSource.RootMediaGroup));
			}
		}

		void HandleGroup (MLMediaGroup group)
		{
			MLMediaObject[] objects = group.MediaObjects;
			if (objects != null)
				HandleMediaObject (objects);
			else
				group.AddObserver ("mediaObjects", 0, c => HandleMediaObject (group.MediaObjects));
		}

		void HandleMediaObject (MLMediaObject[] objects)
		{
			textView.StringValue = string.Format ("Found {0} items", objects.Length);
		}
	}
}