使用 AVPlayerViewController 时如何检测用户对字幕的选择

Question

When using the AVPlayerViewController , the user is allowed to select whether the subtitles are on a specific language, off , or set to auto . Setting the requiresFullSubtitles property I can force the display of subtitles, but that is not what I want.

Is there a way to detect what the user has selected for the subtitle setting, whether a language is selected, off , or auto ?

Answer 1

When using the AVPlayerViewController , the user is allowed to select whether the subtitles are on a specific language, off , or set to auto . Setting the requiresFullSubtitles property I can force the display of subtitles, but that is not what I want.

Is there a way to detect what the user has selected for the subtitle setting, whether a language is selected, off , or auto ?

Answer 2

When using the AVPlayerViewController , the user is allowed to select whether the subtitles are on a specific language, off , or set to auto . Setting the requiresFullSubtitles property I can force the display of subtitles, but that is not what I want.

Is there a way to detect what the user has selected for the subtitle setting, whether a language is selected, off , or auto ?

Answer 3

When using the AVPlayerViewController , the user is allowed to select whether the subtitles are on a specific language, off , or set to auto . Setting the requiresFullSubtitles property I can force the display of subtitles, but that is not what I want.

Is there a way to detect what the user has selected for the subtitle setting, whether a language is selected, off , or auto ?

Answer 4

Swift version of @kotvaska

You can add this observer while configuring session/periodic observers

NotificationCenter.default.addObserver(
    self,
    selector: #selector(didMediaToggle(_:)),
    name: AVPlayerItem.mediaSelectionDidChangeNotification,
    object: nil
)

@objc func didMediaToggle(_ sender: Notification) {
    print("LOGGER: mediaSelectionDidChangeNotification:", sender.description)
    let subtitles = player.currentItem?.asset.mediaSelectionGroup(forMediaCharacteristic: .legible)
    print("LOGGER: mediaSelectionDidChangeNotification: subtitles:", subtitles)
}
/// this will not be called in case of `CC`, aka only `On` and `Off` case

For CC you can give a shot to this notification as CC(Closed Captions) is completely different from Subtitles .

NotificationCenter.default.addObserver(
    self,
    selector: #selector(didCaptionsToggle(_:)),
    name: UIAccessibility.closedCaptioningStatusDidChangeNotification,
    object: nil
)