The second track in the association is considered an appropriate default for the first track.
SDKs
- iOS 7.0+
- macOS 10.9+
- Mac Catalyst 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
Framework
- AVFoundation
Declaration
const AVTrackDiscussion
An association from one track to another specifying that when the user selects the first track, the second should be considered an appropriate default selection. For example, a follower for an audio track could be a subtitle track in the same language. When the user chooses a language for audio, the subtitle language “follows” the audio language selection.