swift - 一次播放一个声音实例

Question

我有一个不断从蓝牙传感器接收整数数据的应用程序，我这样做是为了在整数小于 50 时播放 MP3。

问题在于传感器正在非常快速地检查和发送整数，这导致音频实例过多，基本上是 mp3 文件同时播放了太多次。我怎样才能让它在重新开始之前完成音频？

这是主要代码:

var player: AVAudioPlayer?




if let unwrappedString = Reading {
            let optionalInt = Int(unwrappedString)
            if let upwrappedInt = optionalInt {
                if(upwrappedInt < 50){
                    DispatchQueue.global(qos: .background).async {
                        self.playSound()

                    }
                }
            }
            }

声音功能:

 func playSound() {
        guard let url = Bundle.main.url(forResource: "beep1", withExtension: "mp3") else {
            print("url not found")
            return
        }

        do {
            /// this codes for making this app ready to takeover the device audio
            try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
            try AVAudioSession.sharedInstance().setActive(true)

            /// change fileTypeHint according to the type of your audio file (you can omit this)
            player = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileTypeMPEGLayer3)

            // no need for prepareToPlay because prepareToPlay is happen automatically when calling play()
            player!.play()
        } catch let error as NSError {
            print("error: \(error.localizedDescription)")
        }
    }

Answer 1

如果音频播放器已经在播放(正在播放)，请不要开始播放!

https://developer.apple.com/reference/avfoundation/avaudioplayer/1390139-isplaying