An object used to synchronize with a specific player item.
- iOS 4.0+
- macOS 10.7+
- Mac Catalyst 13.0+
- tvOS 9.0+
You can create an arbitrary number of synchronized layers from the same
A synchronized layer is similar to a
CATransform object in that it doesn't display anything itself, it just confers state upon its layer subtree.
AVSynchronized confers its timing state, synchronizing the timing of layers in its subtree with that of a player item.
Core layer with animation property set that is added as a sublayer of
AVSynchronized should set the animation's
begin property to a non-zero positive value so animations will be interpreted on the player item's timeline.
Core replaces the default
begin of 0.0 with
CACurrent. To start the animation from time 0, use a small positive value like
You might use a layer as shown in the following example: