An optional array of language codes restricting the set of subtitle languages available to the user.
- tvOS 9.0+
By default (when this property’s value is
AVPlayer UI allows a user to choose any (or none) of the subtitle languages associated with media content for display, or an “Auto” option that automatically presents subtitles only when appropriate. To allow only a restricted subset of subtitles, provide an array of BCP47 language codes for this property. Restricting the set of subtitle languages makes the “Auto” option unavailable.