track(withTrackID:)
Returns a track that contains the specified identifier.
Declaration
func track(withTrackID trackID: CMPersistentTrackID) -> AVMutableCompositionTrack?Parameters
- trackID:
The persistent track identifier.
Return Value
A composition track or nil if no track is available.
Discussion
Apple discourages using this method. Load a track asynchronously using loadTrack(withTrackID:completionHandler:) instead.