AVAudioPlayer

The AVAudioPlayer class lets you play sound in any audio format available in iOS and macOS.
AVAudioPlayer可以播放任何iOS和macOS支持的音频格式(.mp3、.caf、.aac)的本地音频文件

do{
        let audioPlayer = try AVAudioPlayer.init(contentsOf: audioUrl)
        audioPlayer.rate = 1.5  //播放速率
        audioPlayer.numberOfLoops = 0//循环播放次数
        audioPlayer.volume = 0.8//音量
        audioPlayer.pan = 0.0 //切换声道 -1.0左声道 0 双声道 1.0 右声道
        audioPlayer.delegate = self//
        audioPlayer.play()
}catch{
}

AVAudioPlayerDelegate

 //播放结束
   func audioPlayerDidFinishPlaying(_ player: AVAudioPlayer, successfully flag: Bool) {
    }
    
//解码失败
  func audioPlayerDecodeErrorDidOccur(_ player: AVAudioPlayer, error: Error?) {
        print("解码失败")
    }
    
//中断开始
    func audioPlayerBeginInterruption(_ player: AVAudioPlayer) {
    }
    
//中断结束
    func audioPlayerEndInterruption(_ player: AVAudioPlayer, withOptions flags: Int) {
    }

通知处理中断

NotificationCenter.default.addObserver(self, selector: #selector(handleAudioInterrupution), name: NSNotification.Name.AVAudioSessionInterruption, object: AVAudioSession.sharedInstance())
      
@objc func handleAudioInterrupution(notification:NSNotification ){
    let userInfo = notification.userInfo
    guard userInfo != nil else {
        return
    }
    
    if let ininterruptionType = userInfo![AVAudioSessionInterruptionTypeKey] as? AVAudioSessionInterruptionType{
        if ininterruptionType == AVAudioSessionInterruptionType.began{
            print("AVAudioSessionInterruptionType.began")
        }else{
            if let options = userInfo![AVAudioSessionInterruptionOptionKey] as? AVAudioSessionInterruptionOptions, options == AVAudioSessionInterruptionOptions.shouldResume{
                print("AVAudioSessionInterruptionType.end let's resume")
            }
        }
    }
    
}

通知处理音道变化

NotificationCenter.default.addObserver(self, selector: #selector(handleAudioSessionRouteChange), name: NSNotification.Name.AVAudioSessionRouteChange, object: AVAudioSession.sharedInstance())

@objc func handleAudioSessionRouteChange(notification:NSNotification){
    let userInfo = notification.userInfo
    guard userInfo != nil else {
        return
    }
    if let reason = userInfo?[AVAudioSessionRouteChangeReasonKey] as? UInt{
        if reason == AVAudioSessionRouteChangeReason.oldDeviceUnavailable.rawValue{//旧设备输出端口移除
            if let routeDescription = userInfo?[AVAudioSessionRouteChangePreviousRouteKey] as? AVAudioSessionRouteDescription{
                let portDescription = routeDescription.outputs[0]
                if portDescription.portName == "耳机"{
                    self.audioPlayer?.pause()
                }
            }
        }else if reason == AVAudioSessionRouteChangeReason.newDeviceAvailable.rawValue{//新设备输出端口接入
            let routeDescription = AVAudioSession.sharedInstance().currentRoute
            let portDescription = routeDescription.outputs[0]
            if portDescription.portName == "耳机",audioPlayer != nil,selIndex>=0{
                self.audioPlayer?.play()
            }
        }
    }
}

切换声道

func resetAuidoSession(isRecord:Bool) {
    let audioSession = AVAudioSession.sharedInstance()
    do{
        try audioSession.setCategory(isRecord ? AVAudioSessionCategoryPlayAndRecord : AVAudioSessionCategoryPlayback)
        try audioSession.setActive(true)
    }catch{
        
    }
}

参考链接：AVAudioPlayer