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core-animation

During an animation, can the properties of every CALayer be read atomically in the presentationLayer tree?

I'm looking for a solution to make a video from a CoreAnimation animation.

If I recursively enumerate the sublayers of my root CALayer presentation layer, is there a risk that the values(position, transform, opacity..) keep on changing while I'm a reading the properties in the (presentation) tree ? Or is the presentation layer like a deep copy of the CALayer hierarchy ?

Solution

  • The presentation layer is a deep copy of the model layer, with all the active animations applied. It's not actually the literal presentation tree that's used to render to screen, it's just an approximation.