快速清除音频文件的内容

Question

我正在尝试清除音频文件的内容而不删除和创建新文件，我完全被难倒了。

如果需要这里我用来录制音频的代码：

func record(){
    let audioSession:AVAudioSession = AVAudioSession.sharedInstance()
    let audioHeardUrl = URL(fileURLWithPath: Bundle.main.path(forResource: "recordedAudio", ofType: "caf")!)
    let recordSettings: [String: Any] = [AVFormatIDKey:kAudioFormatAppleIMA4,
                                         AVSampleRateKey:44100.0,
                                         AVNumberOfChannelsKey:2,AVEncoderBitRateKey:12800,
                                         AVLinearPCMBitDepthKey:16,
                                         AVEncoderAudioQualityKey:AVAudioQuality.max.rawValue]

    do {
        try audioSession.setCategory("AVAudioSessionCategoryRecord")
    } catch { print("Setting Audio Session Category Error") }

    do {
        try audioSession.setActive(true)
    } catch { print("Activating Audio Session Error") }

    do {
        try recordedAudio = AKAudioFile(forWriting: audioHeardUrl, settings: recordSettings)
    } catch { print("Audio Storing Error") }

    do {
        try audioRecorder = AKNodeRecorder(node: mic, file: recordedAudio)
    } catch { print("Creating Audio Recorder Error") }

    var error: NSError?

    if let e = error {
        print(e.localizedDescription)
    } else {
        do {
            try audioRecorder.record()
        } catch { print("Recording Error") }
    }
}