Question

如果我使用的是背景音频，那么developer.apple.com会发送给我邮件

您的应用声明在Info.plist中的UIBackgroundModes键中声明支持音频，但是当应用在后台运行时，我们无法播放任何可听内容。

后续步骤

音频键适用于在后台为用户提供可听内容的应用，例如音乐播放器或流媒体音频应用。请修改您的应用，以便在应用处于后台时向用户提供可听内容，或从UIBackgroundModes键中删除“音频”设置。

代码： -

let appDelegate = UIApplication.shared.delegate as! AppDelegate
if soundPath == "" {
   appDelegate.playSound()
}else {
   appDelegate.playSoundWithPath(notificationSoundPath: soundPath)
}

播放声音（）： -

func playSound() {
  let url = Bundle.main.url(forResource: "loud_alarm", withExtension: "caf")!
  do{
      player = try AVAudioPlayer(contentsOf: url)
      guard let player = player else {return}
      player.prepareToPlay()
      player.play()
    } catch _ as NSError {

    }
}

如何解决这个问题

Answer 1

播放音频前添加以下代码：

do {
    try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
 }
 catch {
    // catch error
 }

Answer 2

我已发送邮件developer.apple.com邮件，因为背景音频失败

此： -

准则2.5.4 - 性能 - 软件要求您的应用声明在Info.plist中的UIBackgroundModes键中声明对音频的支持，但不包括需要持久音频的功能。

后续步骤音频密钥旨在供在后台为用户提供可听内容的应用程序使用，例如音乐播放器或流媒体音频应用。请修改您的应用，以便在应用在后台时向用户提供可听内容，或者删除音频＆＃34;从UIBackgroundModes键设置。

如何解决此问题

我的代码是

 public Map<String,String> loadObject(ArrayList<Integer> tradigAccountList){

        com.datastax.driver.core.Session session;
        Map<String,String> orderListMap = new HashMap<>();
        List<ResultSetFuture> futures = new ArrayList<>();
        List<ListenableFuture<ResultSet>> Future;

        try {
            session =jdbcUtils.getCassandraSession();
            PreparedStatement statement = session.prepare(
                    "SELECT * FROM omsks_v1.ordersStringV1 WHERE tradacntid = ?");

            for (Integer tradingAccount:tradigAccountList){
                futures.add(session.executeAsync(statement.bind(tradingAccount).setFetchSize(50000)));
            }
            Future = Futures.inCompletionOrder(futures);
            for (ListenableFuture<ResultSet> future : Future){
                for ( Row row : future.get()){
                    orderListMap.put(row.getString("cliordid"),row.getString("ordermsg"));
                }
            }

        }catch (Exception e){
        }finally {
        }
        return orderListMap;
    }

和playsound（）函数代码是

 trunOffAlarm.isHidden = false
        let appDelegate = UIApplication.shared.delegate as! AppDelegate
        if soundPath == "" {

            appDelegate.playSound()
        }else {
            appDelegate.playSoundWithPath(notificationSoundPath: soundPath)
        }

Answer 3

/**
 setup and play the sound of the local mp3 file
 */
@objc func setupAudioPlayer() {
    // TODO: load the audio file asynchronously and observe player status
    if (userSelectedRingTone.isEmpty) {
       ringToneName = "Default_Siren"
    } else {
        guard (isFromHamburgerMenuDefaultTone) else {
            ringToneName = self.userSelectedRingTone
            isFromHamburgerMenuDefaultTone = false
            self.playSound(soundName: ringToneName)
            return
        }
        ringToneName = "Default_Siren"
    }
       self.playSound(soundName: ringToneName)

}

func playSound( soundName : String) {
    guard let url = Bundle.main.url(forResource: soundName, withExtension: "mp3") else { return }

    do {
        try 
AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        try AVAudioSession.sharedInstance().setActive(true)
        /* The following line is required for the player to work on iOS 11. Change the file type accordingly*/
        audioPlayer = try AVAudioPlayer(contentsOf: url, fileTypeHint: AVFileType.mp3.rawValue)
        audioPlayer?.delegate = self


        guard let player = audioPlayer else { return }
//            player.play()
    } catch let error {
        print(error.localizedDescription)
    }
}


// if you continue to play the audio then add this delegate method
func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    if (playAudioRepeatedly) {
        audioPlayer?.play()
    }
}

在swift中以静音模式播放闹钟

3 个答案: