ios - 未调用 Swift audioPlayerDidFinishPlaying 方法

Question

我在 MainStoryBoard 上创建了三个 UIButton。

当我按下“yourButton3”时，不会调用 player3。

我发现更改 else if 子句或将某些内容分配给 player3 可以解决此问题，但不知道如何解决。

       override func viewDidLoad() {
            super.viewDidLoad()
            player1?.delegate = self
            player2?.delegate = self
            player3?.delegate = self
        }

        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!
        @IBOutlet weak var yourButton3: customButton!


        fileprivate var player1:AVAudioPlayer?
        fileprivate var player2:AVAudioPlayer?
        fileprivate var player3:AVAudioPlayer?


        @IBAction func pushButton1(sender: UIButton) {
            Player(url: url1)
        }

        @IBAction func pushButton2(sender: UIButton) {
            Player1(url: url2)
        }

        @IBAction func pushButton3(_ sender: UIButton) {
            Player(url: url2)
            player1!.play()

        }

//player3 is not called in this code

        func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
            if (player === player1) {
                yourButton.isSelected = false
            } else if (player === player2) {
                yourButton2.isSelected = false
            } else if (player === player3) {
                yourButton.isSelected = false
                player2!.play()
                yourButton2.isSelected = false
            }
        }



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

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

            } catch {
                print(error)
            }
        }

        func Player3(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

您还没有在 Player(url:) 函数中初始化 player3，因此 player === player3 永远不会为真。

您可以编辑您的 Player3(url:, url2:) 函数，如下所示:

func Player3(url: URL, url2: URL) {
    do {
        try player3 = AVAudioPlayer(contentsOf:url)
        try player2 = AVAudioPlayer(contentsOf: url2)
        player3!.play()
        yourButton.isSelected = true
        player3!.delegate = self
        player2!.delegate = self
    } catch {
        print(error)
    }
}

然后这样调用它:

@IBAction func pushButton3(_ sender: UIButton) {
    Player3(url: url1, url2: url2)
}