Markus Müller schrieb:

Hab das nie probiert mit einem presentationLayer: aber vlt. klappt ja ne Observierung der properties? Oder sind die nicht KVO-kompliant (bin unterwegs und hab die Doku nicht zur Hand).

presentationLayer
Returns a copy of the layer containing all properties as they were at the start of the current transaction, with any active animations applied.

- (id)presentationLayer
Return Value
A layer instance representing the current presentation layer.

Discussion
This method provides a close approximation to the version of the layer that is currently being displayed. The sublayers, mask, and superlayer properties of the returned layer return the presentation versions of these properties. …