Recommended way to keep a custom radial/gradient CALayer in sync during the fold transition

UI Frameworks UIKit
Vijayparmarios OP
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This post is from the Activity iPhone Duo UIKit Q&A.

We have a CALayer subclass performing custom draw(in:) rendering (a radial gradient) behind a card view, resized via viewDidLayoutSubviews. For an ordinary rotation we sync it inside coordinator.animate(alongsideTransition:). If the fold/unfold transition doesn't go through viewWillTransition at all (per Q1), what is the recommended hook to animate custom CALayer content smoothly across this specific transition, given it appears to involve a scene relocation rather than a resize?

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Recommended way to keep a custom radial/gradient CALayer in sync during the fold transition
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