未触发 audioPlayerDidFinishPlaying答案

【问题标题】：audioPlayerDidFinishPlaying is not triggered未触发 audioPlayerDidFinishPlaying
【发布时间】：2021-06-01 08:40:19
【问题描述】：

每个谷歌都有类似的 OP 退出，但我没有通过关注他们来解决我的问题。看来我已经关门了，但仍然无法弄清楚哪里出了问题，在这里感谢任何提示。

我的 AudioPlayer 作为单例模式放在一个单独的文件中

class AudioPlayer {
    // Singleton to keep audio continue to play when switching viewControllers
    static let shared = AudioPlayer()
    var player: AVAudioPlayer?
    
    private init() {}
    
    func play(url: URL) {
        do {
            player = try AVAudioPlayer(contentsOf: url)
            guard let player = player else { return }
            player.prepareToPlay()
            player.play()
        } catch {
            print(error)
        }
    }
}

然后在PlayerViewController中作为播放场景。我输入了player.delegate = self。并将委托方法放在下面。我调试发现audioPlayerDidFinishPlaying 没有被调用。

class PlayerViewController: UIViewController, AVAudioPlayerDelegate {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        AudioPlayer.shared.player?.delegate = self
    }

    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        if flag {
            print("EAT")
            goNextTrack()
        } else {
            fatalError("the audio doesn't finished playing successfully.")
        }
    }
}

【问题讨论】：

标签： ios swift avfoundation avaudioplayer

【解决方案1】：

在你打电话给play之前可能是这样

AudioPlayer.shared.player?.delegate = self // here player is nil and delegate won't work 
AudioPlayer.shared.play(url:////)

不一样

AudioPlayer.shared.play(url:////)  
AudioPlayer.shared.player?.delegate = self  // here player has a value  and delegate will work

【讨论】：

是的。这里的问题是AudioPlayer.shared.player?.delegate = self 在玩家初始化player = try AVAudioPlayer(contentsOf: url) 之前被调用。谢谢，我想我真的很接近这个问题，但只是找不到它。