ios - 如何在一个类中使用 audioPlayerDidFinishPlaying

Question

Player1 运行良好，但我在执行 Player2 时出错。

我应该如何更改 audioPlayerDidFinishPlaying 以使其工作？

这是我的 ViewController.swift 的代码:

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


  func Player1(url: URL) {
    do {
        try player2 = AVAudioPlayer(contentsOf:url)
        player2!.play()
        yourButton2.isSelected = true
        player2!.delegate = self

    } catch {
        print(error)
    }
}

  func Player2(url: URL, url2: URL) {
    do {
        try player1 = AVAudioPlayer(contentsOf:url)
        try player2 = AVAudioPlayer(contentsOf: url2)
        player1!.play()
        yourButton.isSelected = true
        player1!.delegate = self
    } catch {
        print(error)
    }
}

Answer 1

在 audioPlayerdidFinishPlaying(_:successfully:) 中，您有一个 else if 子句永远不会变为 true:

} else if (player === player3) {

player3 将始终 为nil 因为您永远不会为其分配任何内容。因此，您在 audioPlayerdidFinishPlaying(_:successfully:) 中的第 3 个分支将永远不会被执行。要在您当前的类(class)设计中实现此功能，您需要:

• 更改else if 子句
• 分配一些东西给player3