Swift如何在不继承AVAudioPlayer的类上使用AVAudioPlayerDelegate？

class myClass: AVAudioPlayerDelegate{
    var player = AVAudioPlayer()

    init(){
        player.delegate = self
    }

    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
          print("The song ended")
    }
}
class myClass: AVAudioPlayerDelegate{
    var p