如果录制音频，声音无法播放？

Question

我有一个应用程序，每x秒发出一次声音。如果我正在录制音频，它会停止播放噪音，即使我能看到日志中触发的噪音/

相关代码：

import AVFoundation

-

var audioRecorder:AVAudioRecorder!

let session = AVAudioSession.sharedInstance()

-

override func viewDidLoad() {
    super.viewDidLoad()

    do {
        try! session.setCategory(AVAudioSessionCategoryPlayAndRecord, with: .defaultToSpeaker)
    }
}

func startRecording() {


    let df = DateFormatter()
    df.dateFormat = "y-MM-dd H:m"

    let fileName = "\(df.string(from: time)).wav"
    let path = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(fileName)

    audioRecorder = try! AVAudioRecorder(url: path, settings: [:])

    audioRecorder.isMeteringEnabled = true
    audioRecorder.prepareToRecord()
    audioRecorder.record()
}

播放声音的代码：

let systemSoundID: SystemSoundID = 1016 //random sound id
AudioServicesPlaySystemSound(systemSoundID)

有什么想法吗？

由于