A mutable object used to create a new composition from existing assets.
UIKit for Mac 13.0+Beta
This class provides the ability to add and remove tracks, and you can add, remove, and scale time ranges. You can make an immutable snapshot of a mutable composition for playback or inspection as follows:
A mutable track in a composition object that you use to insert, remove, and scale track segments without affecting their low-level representation.
This documentation contains preliminary information about an API or technology in development. This information is subject to change, and software implemented according to this documentation should be tested with final operating system software.