ios - 如何在 audioPlayerDidFinishPlaying 方法中使用多个 play()

Question

当我按下“yourButton”或“yourButton2”或“yourButton3”时，每个按钮都会播放一个音频文件，并且在播放音频时，UIButton 被设置为选中状态。

我希望“yourButton4”连续实现其他 UIButton 的方法。 (首先，播放音频文件并设置选择的“yourButton”，然后是“yourButton2”和“yourButton3”)。

但是，当我按下“yourButton4”时，“yourButton2”和“yourButton3”同时播放，因为 play() 方法异步播放声音。

        let url1 = Bundle.main.bundleURL.appendingPathComponent("music1.mp3")
        let url2 = Bundle.main.bundleURL.appendingPathComponent("music2.mp3")
        let url3 = Bundle.main.bundleURL.appendingPathComponent("music3.mp3")


        @IBOutlet weak var yourButton: customButton!
        @IBOutlet weak var yourButton2: customButton!
        @IBOutlet weak var yourButton3: customButton!
        @IBOutlet weak var yourButton4: 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) {
            Player2(url: url1, url2: url2, url3: url3)
        }



        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 = true
                player2!.play()
                yourButton3.isSelected = true
                player1!.play()
            }
        }

        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 Player2(url: URL, url2: URL, url3: URL) {
            do {
                try player3 = AVAudioPlayer(contentsOf:url)
                try player2 = AVAudioPlayer(contentsOf: url2)
                try player1 = AVAudioPlayer(contentsOf: url3)
                player3!.play()
                yourButton.isSelected = true
                player3!.delegate = self
                player2!.delegate = self
                player1!.delegate = self
            } catch {
                print(error)
            }
        }

Answer 1

不要在 VC 中使用这 3 个不同

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

而不是在 AppDelegate 中仅使用其中一个并从您的 VC 访问它，这样您就不会遇到同样的问题。下一个音频播放时，上一个音频将停止

在 App delegate 中使用:

var player1:AVAudioPlayer?

再次在您的 VC 中使用此实例

func Player1(url: URL) {
            do {
 let appDelegate = UIApplication.sharedApplication().delegate as! AppDelegate
                try appDelegate.player1 = AVAudioPlayer(contentsOf:url)
                appDelegate.player1!.play()
                yourButton2.isSelected = true
                appDelegate.player1!.delegate = self

            } catch {
                print(error)
            }
        }