Ios Swift：共享扩展中的音频录制仅在第一次运行时有效

我正在使用AVAudioRecorder录制共享分机中的音频。它在第一次运行时运行良好，但从那里我无法录制另一个音频

var audioRecorder            : AVAudioRecorder?

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     let dirPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)
     let docDir = dirPath[0]
     let soundFilePath = (docDir as NSString).appendingPathComponent("sound.wav")
     soundFileURL = NSURL(fileURLWithPath: soundFilePath) as URL
     print(soundFilePath)

     //Setting for recorder
    let recordSettings = [AVEncoderAudioQualityKey: AVAudioQuality.max.rawValue,
         AVEncoderBitRateKey: 16,
         AVNumberOfChannelsKey : 2,
         AVSampleRateKey: 44100.0] as [String : Any] as [String : Any] as [String : Any] as [String : Any]
     var error : NSError?
     let audioSession = AVAudioSession.sharedInstance()
     do {
        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
        self.audioRecorder = try AVAudioRecorder(url: soundFileURL!, settings: recordSettings as [String : AnyObject])
     } catch _ {
         print("Error")
     }

     if let err = error {
         print("audioSession error: \(err.localizedDescription)")
     }else{
         self.audioRecorder?.prepareToRecord()
         
     }

在记录按钮上单击

    self.audioRecorder?.record()