How can I get access to ViewController from MPNowPlayingInfoCenter - ios

Question

I'm working on an audio player and came across this situation:
I have a TrackDetailView that opens to play a track when I click on a TableView cell. Also I have implemented background playback and MPNowPlayingInfoCenter.
When I press Pause or Play button in MPNowPlayingInfoCenter, I want the button image to change on my TrackDetailView as well, but I just can't do it. I will be glad for any help.
Important note(!) TrackDetailView and MPNowPlayingInfoCenter are in different classes. When I put them in one class everything works without problems.
My code:
class TrackDetailView: UIView {
var audioPlayer = AudioPlayer()
...
#IBOutlet var playPauseButton: UIButton!
...
//Loading with view
func set() {
setupMediaPlayerNotificationView()
}
}
class AudioPlayer {
var trackDetailView: TrackDetailView?
func setupMediaPlayerNotificationView() {
let commandCenter = MPRemoteCommandCenter.shared()
commandCenter.playCommand.addTarget { [unowned self] event in
if self.player.rate == 0.0 {
self.player.play()
self.trackDetailView?.playPauseButton.setImage(#imageLiteral(resourceName: "pause"), for: .normal)
}
return .commandFailed
}
commandCenter.pauseCommand.addTarget { [unowned self] event in
if self.player.rate == 1.0 {
self.player.pause()
self.trackDetailView?.playPauseButton.setImage(#imageLiteral(resourceName: "play"), for: .normal)
return .success
}
return .commandFailed
}
...
}
}
I think I have a problem with an instance of the TrackDetailView class.

Answer 1

You need to make sure that for this instance
var audioPlayer = AudioPlayer()
you set
audioPlayer.trackDetailView = self
e.x here
func set() {
audioPlayer.trackDetailView = self
audioPlayer.setupMediaPlayerNotificationView()
}