Tracking changing properties during animation

I've set up a few views in my iPhone app that I can move around using the provided animation functions. But now I want to also draw stuff on the containing view to connect objects. That works, but it does not update during animations. I have added code in the frame: method of my small views to post a setNeedsDisplay, but that only gets called at the end of the animation.
So is there a way to observe the changes made in individual frames of an animation? Either from the animation side, or from within the views?

Haven't found a way to do this properly, but now don't need it anymore. Key-value-observing comes close, but doesn't work for animated properties. Probably would work if I used CALayer directly.

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