AVAudioPlayer 不认为它在播放时

Posted 2023-02-24

【中文标题】AVAudioPlayer 不认为它在播放时

【英文标题】：AVAudioPlayer does not think it is playing when it is

【发布时间】：2020-05-09 01:43:32

【问题描述】：

稍后我调用superPlay 函数开始音频播放我再次调用superPlay 函数停止播放。但这不起作用，因为即使知道声音显然在无限循环中播放，player.isPlaying 也是错误的。我不知道为什么请帮忙！

   func superPlay(timeInterval: TimeInterval, soundName: String) 
        do 
            alarmSound = soundName
            //set up audio session
            try AVAudiosession.sharedInstance().setCategory(.playAndRecord, options: [.defaultToSpeaker, .duckOthers])
            try AVAudioSession.sharedInstance().setActive(true)

            let url = Bundle.main.url(forResource: alarmSound, withExtension: "mp3")

            player = try! AVAudioPlayer(contentsOf: url!)
            player.numberOfLoops = -1
            //Start AVAudioPlayer
            print(timeInterval)
            print(time)
            let playbackDelay = timeInterval  // must be ≥ 0

            if player.isPlaying 
                player.stop()
             else 
                player.play(atTime: player.deviceCurrentTime + playbackDelay) //time is a TimeInterval after which the audio will start
            
        
        catch 
            print(error)
        
    

我现在又花了几天时间调试它。发生的事情是将原始播放分配给特定的 AudioPlayer ID，例如打印是："Optional(<AVAudioPlayer: 0x600002802280>)" 当我再次调用该函数以停止播放时，为 AVAudioPlayer 分配了不同的 ID，因此它不会发现旧播放器仍在播放，而是在旧声音之上播放新声音。

我不确定如何存储 AVAudioPlayer ID，然后调用该函数以检查商店播放器是否为“.isPlaying”？？

【问题讨论】：

如果发生延迟，说明播放器尚未播放。

我最终发现 audioPlayer 对象被保存在调用启动 audioPlayer 播放的函数的文件中。所以我在该文件中添加了停止，现在它可以工作了。

【参考方案1】：

发生这种情况是因为您在停止当前音频之前对其进行了初始化。试试这个方法：-

    func superPlay(timeInterval: TimeInterval, soundName: String) 

        //        If audio is playing already then stop it.
        if let audioPlayer = player 
            if player.isplaying 
                player.stop()
            
        
        //        Initilize audio player object with new sound
        do 
            alarmSound = soundName
            //set up audio session
            try AVAudioSession.sharedInstance().setCategory(.playAndRecord, options: [.defaultToSpeaker, .duckOthers])
            try AVAudioSession.sharedInstance().setActive(true)

            let url = Bundle.main.url(forResource: alarmSound, withExtension: "mp3")

            player = try! AVAudioPlayer(contentsOf: url!)
            player.numberOfLoops = -1
            //Start AVAudioPlayer
            print(timeInterval)
            print(time)
            let playbackDelay = timeInterval  // must be ≥ 0

            player.play(atTime: player.deviceCurrentTime + playbackDelay) //time is a TimeInterval after which the audio will start
        
        catch 
            print(error)
        
    

【讨论】：

非常感谢您的帮助。这并没有解决问题，声音仍在播放，实际上第二个声音开始在第一个声音之上播放。我调试了一下它没有输入“if let audioPlayer.isplaying”条件代码。