在 swift 中以静音模式播放闹钟

Question

如果我在播放背景音频，那么 developer.apple.com 给我发邮件

您的应用在 Info.plist 的 UIBackgroundModes 键中声明支持音频，但是当应用运行在后台时我们无法播放任何音频内容。

后续步骤

音频键专供在后台向用户提供音频内容的应用使用，例如音乐播放器或流式音频应用。请修改您的应用程序以在应用程序处于后台时向用户提供音频内容，或者从 UIBackgroundModes 键中删除 "audio" 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

在播放音频之前添加以下代码：

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

Answer 2

我已发送邮件developer.apple.com背景音频邮件失败

这个：-

准则 2.5.4 - 性能 - 软件要求您的应用在 Info.plist 的 UIBackgroundModes 键中声明了对音频的支持，但不包含需要持久音频的功能。

后续步骤音频密钥旨在供在后台向用户提供音频内容的应用程序使用，例如音乐播放器或流式音频应用程序。请修改您的应用程序以在应用程序处于后台时向用户提供声音内容，或者从 UIBackgroundModes 键中删除 "audio" 设置。

如何解决这个问题

我的代码是

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

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

和playsound()函数代码为

 func playSound() {
    let url = Bundle.main.url(forResource: "loud_alarm", withExtension: "caf")!
    do {
        try AVAudioSession.sharedInstance().setCategory(AVAudioSessionCategoryPlayback)
        //print("AVAudioSession Category Playback OK")
        do {
            try AVAudioSession.sharedInstance().setActive(true)
            //print("AVAudioSession is Active")
        } catch _ as NSError {
            //print(error.localizedDescription)
        }
    } catch _ as NSError {
        //print(error.localizedDescription)
    }
    do {
        player = try AVAudioPlayer(contentsOf: url)
        guard let player = player else {return}
        player.prepareToPlay()
        player.play()

    } catch _ as NSError {

    }

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

Play Alarm in silent mode in swift

alarm

ios

swift