错误域= kAFAssistantErrorDomain代码= 209"(null)" - 重置按钮杀死听写

Question

当我点击我的应用程序的重置按钮和语音识别时,我反复收到此错误消息.只有当应用程序正在主动收听语音识别时点击按钮才会发生这种情况.该应用程序看起来仍在录制,但它不会再接受任何输入.它也不会让我停止录音.代码如下.

@IBAction func resetTapped(_ sender: Any) {

    if audioEngine.isRunning {

        audioEngine.stop()
        recognitionRequest?.endAudio()

    }

    globalVariables.tempText = ""
    globalVariables.finalText = ""
    globalVariables.boolRecording = false

    self.inView.text = ""
    self.resultView.text = ""

    inView.backgroundColor = UIColor.red

}

private let speechRecognizer = SFSpeechRecognizer(locale: Locale.init(identifier: "en-US"))
private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
private var recognitionTask: SFSpeechRecognitionTask?
private let audioEngine = AVAudioEngine()

func startRecording() -> String {

    self.inView.text = ""

    if recognitionTask != nil {

        recognitionTask?.cancel()
        recognitionTask = nil

    }

    let audioSession = AVAudioSession.sharedInstance()

    do {

        try audioSession.setCategory(AVAudioSessionCategoryPlayAndRecord)
        try audioSession.setMode(AVAudioSessionModeMeasurement)
        try audioSession.setActive(true, with: .notifyOthersOnDeactivation)

    } catch {

        print("audioSession properties weren't set because of an error.")

    }

    recognitionRequest = SFSpeechAudioBufferRecognitionRequest()

    guard let recognitionRequest = recognitionRequest else {

        fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")

    }

    recognitionRequest.shouldReportPartialResults = true

    recognitionTask = speechRecognizer?.recognitionTask(with: recognitionRequest, resultHandler: { (result, error) in

        var isFinal = false

        if result != nil {

            if globalVariables.boolRecording == true {

                self.inView.text = result?.bestTranscription.formattedString
                globalVariables.tempText = self.spaceChanges(String: self.recordingChanges(String: self.inView.text))
                self.resultView.text = globalVariables.finalText + globalVariables.tempText

            }

            isFinal = (result?.isFinal)!

        }

        if error != nil || isFinal {

            self.audioEngine.stop()
            self.audioEngine.inputNode.removeTap(onBus: 0)

            self.recognitionRequest = nil
            self.recognitionTask = nil

        }

    })

    audioEngine.inputNode.removeTap(onBus: 0)

    let recordingFormat = audioEngine.inputNode.outputFormat(forBus: 0)

    audioEngine.inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer, when) in self.recognitionRequest?.append(buffer) }

    audioEngine.prepare()

    do {
        try audioEngine.start()
    } catch {
        print("audioEngine couldn't start because of an error.")
    }
    return self.inView.text
}