How exactly to subclass CALayer and use a custom property?

Question

I am trying to create a subclass of CALayer with a custom index property that I can both animate and change directly in order to display a different pi

Answer 1

There is an excellent tutorial on the web that explains how to create a custom CALayer subclass with animatable properties. I haven't had occasion to try it yet, but I bookmarked it. Here is the link:

Animating Pie Slices Using a Custom CALayer

It looks like the main tricks are:

Use @dynamic, not @synthesize for the animatable properties of your custom CALayer.

Override actionForKey:, initWithLayer:, and needsDisplayForKey:, and perhaps drawInContext: