I have code that draws the content of my layers. It's made up of various Quartz primitives.

I'd like to animate aspects of these drawings, like the color of certain lines (for example). Is it possible to do this? It would require having a property that CA can change, and require that my draw code be called each frame.

Is this something that would require a custom CAAnimation subclass? Is there documentation for this? I read through the "Core Animation Programming Guide," but haven't found what I seek.

TIA,
--
Rick

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