ios - 如何多次使用 audioPlayerDidFinishPlaying

Question

我在 MainStoryBoard 上创建了带有图像的 UIButton。当我按下该按钮时，它会播放一个音频文件，并且在播放音频时 UIButton 的背景颜色会发生变化。

audioPlayerDidFinishPlaying1 被正确调用，但是 audioPlayerDidFinishPlaying2似乎没有被调用。我很感激任何帮助我解决这个问题的建议。

    let url1 = Bundle.main.bundleURL.appendingPathComponent("music1.mp3")
    let url2 = Bundle.main.bundleURL.appendingPathComponent("music2.mp3")

    @IBOutlet weak var yourButton: CustomButton!
    @IBOutlet weak var yourButton2: CustomButton! 

   func Player(url: URL) {
        do {
            try player = AVAudioPlayer(contentsOf:url)
            player.play()
            yourButton.isSelected = true
            player.delegate = self
        } catch {
            print(error)
        }
    }

    func Player1(url: URL) {
        do {
            try player = AVAudioPlayer(contentsOf:url)
            player.play()
            yourButton2.isSelected = true
            player.delegate = self
        } catch {
            print(error)
        }
    }
    @IBAction func pushButton1(sender: UIButton) {
        Player(url: url1)
    }
    func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
        yourButton.isSelected = false

    }

    @IBAction func pushButton2(sender: UIButton) {
        Player1(url: url2)
    }
    func audioPlayerDidFinishPlaying2(_ player: AVAudioPlayer, successfully flag: Bool) {
        yourButton2.isSelected = false
    }

Answer 1

您正在使用 Player1/Player 方法在本地创建播放器。所以当方法结束时，播放器将被释放。将生成的播放器保留为类成员，这样它就不会在方法退出时被释放

在你的类中添加:

class YourClass
{
    let url1 = Bundle.main.bundleURL.appendingPathComponent("music1.mp3")
    let url2 = Bundle.main.bundleURL.appendingPathComponent("music2.mp3")

    @IBOutlet weak var yourButton: CustomButton!
    @IBOutlet weak var yourButton2: CustomButton! 

    fileprivate var player1: AVAudioPlayer? 
    fileprivate var player2: AVAudioPlayer?

    .
    .
    .

    func Player(url: URL) {
        do {
            try player1 = AVAudioPlayer(contentsOf:url)
            player1!.play()
            yourButton.isSelected = true
            player1!.delegate = self
        } catch {
            print(error)
        }
    }

另一件事.. 您正在使用委托(delegate)方法 audioPlayerDidFinishPlaying，它是 AVAudioPlayer 的委托(delegate)方法。但是 audioPlayerDidFinishPlaying2 不是，所以在这里没用。由于您有两名玩家，一个类(class)作为代表，您需要确定哪个玩家已完成并更改正确的按钮。

func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    if (player === player1) {
        yourButton.isSelected = false
    } else if (player === player2) {
        yourButton2.isSelected = false
    }
}