Custom Property Animation in CALayer

Question

I am trying to get the animation to work with a custom property in CALayer.

But I just can’t figure out how to do it right. The key "myCounter" is never sent to NeedsDisplayForKey. Are there some steps I'm missing? Below is the class I'm testing, which I am adding to the layer elsewhere. Has anyone gotten a custom property for animation using monotote?

    public class TestProperty : CALayer
    {
    //this line updated based on feedback below**********
        public uint myCounter { [Export ("myCounter")] get; [Export setMyCounter:")]  set; }


    public TestProperty ()
    {
        CABasicAnimation anim = CABasicAnimation.FromKeyPath("myCounter");
        anim.From = NSNumber.FromInt32(1);
        anim.To = NSNumber.FromInt32(10);
        anim.Duration = 1.0f;
        anim.RepeatCount = float.MaxValue;
        anim.AutoReverses = true;
        this.AddAnimation(anim,null);
    }

    [Export ("needsDisplayForKey:")]
    static bool NeedsDisplayForKey (NSString key)
    {
        Console.WriteLine("{0}", key.ToString());

        if(key.Equals("myCounter"))
        {
            return true; //never gets here
        }
        else
            return false;

    }
    }

Answer 1

MonoTouch does not have the same automatic KVC registration support as MonoMac, so you should use:

public uint myCounter { [Export ("myCounter")] get; [Export ("setMyCounter:")] set; }

Answer 2

, , MonoTouch, (5.3.3), , , .

5.3.3, : https://github.com/xamarin/monotouch-samples/tree/monotouch-5.4/CustomPropertyAnimation, , .