ios – The way to clear buffer lead to Speech Recognizer in Swift

I am making an attempt to write down speech recognizer which may have a capability to be cleared after some length like 2 seconds with out switching it off

    personal func startRecording() throws {
        
        recognitionTask?.cancel()
        self.recognitionTask = nil
        
        let audioSession = AVAudioSession.sharedInstance()
        attempt audioSession.setCategory(.document, mode: .measurement, choices: .duckOthers)
        attempt audioSession.setActive(true, choices: .notifyOthersOnDeactivation)
        let inputNode = audioEngine.inputNode

        recognitionRequest = SFSpeechAudioBufferRecognitionRequest()
        guard let recognitionRequest = recognitionRequest else { fatalError("Unable to create a SFSpeechAudioBufferRecognitionRequest object") }
        recognitionRequest.shouldReportPartialResults = true
        
        // Maintain speech recognition knowledge on machine
        if #accessible(iOS 13, *) {
            recognitionRequest.requiresOnDeviceRecognition = false
        }
        
        recognitionTask = speechRecognizer.recognitionTask(with: recognitionRequest) { end result, error in
            var isFinal = false
            
            if let end result = end result {
                self.textView.textual content = end result.bestTranscription.formattedString



                // MARK: right here after 2 seconds my recognition ought to clear it is personal lead to string




                isFinal = end result.isFinal
                print("Textual content (end result.bestTranscription.formattedString)")
            }
            
            if error != nil || isFinal {
                self.audioEngine.cease()
                inputNode.removeTap(onBus: 0)

                self.recognitionRequest = nil
                self.recognitionTask = nil

                self.recordButton.isEnabled = true
                self.recordButton.setTitle("Begin Recording", for: [])
            }
        }
        let recordingFormat = inputNode.outputFormat(forBus: 0)
        inputNode.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { (buffer: AVAudioPCMBuffer, when: AVAudioTime) in
            self.recognitionRequest?.append(buffer)
        }
        
        audioEngine.put together()
        attempt audioEngine.begin()
        
        textView.textual content = "(Go forward, I am listening)"
    }

I cannot rebuild speech recognition, it needs to be work continually.

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

I attempted to do like this however after it my microphone turns off