`audioPlayerDidFinishPlaying`未被调用

Question

出现audioPlayerDidFinishPlaying无法调用的问题...

我看过其他一些SO线程：

Swift: AudioPlayerDidFinished will not be called

AVAudioPlayerDelegate doesn't call the method

...但是仍然有相同的问题。

我将我的ViewController设置为符合AVAudioPlayerDelegate：

class ViewController: UIViewController, AVAudioPlayerDelegate {
var audioEngine = AVAudioEngine()
...
}

并在此处创建播放器；在创建播放器本身之后立即设置代表：

func startAudioEngine(audioFileURL: URL) {

    var player: AVAudioPlayer?

    do {
        try AVAudioSession.sharedInstance().setCategory(.playback, mode: .default)
        try AVAudioSession.sharedInstance().setActive(true)

        player = try AVAudioPlayer(contentsOf: audioFileURL, fileTypeHint: AVFileType.mp3.rawValue)

        guard let player = player else { return }
        player.delegate = self

        player.prepareToPlay()
        player.play()

    } catch let error {
        print(error.localizedDescription)
    }
}

Answer 1

您的问题是双重的：