ios语音转文字怎么导入语音

import Speech

class ViewController: UIViewController, SFSpeechRecognizerDelegate {

    private let speechRecognizer = SFSpeechRecognizer(locale: Locale(identifier: "zh-CN")) // 设置语音识别的语言为中文
    private var recognitionRequest: SFSpeechAudioBufferRecognitionRequest?
    private var recognitionTask: SFSpeechRecognitionTask?
    private let audioEngine = AVAudioEngine()

    override func viewDidLoad() {
        super.viewDidLoad()
        
        speechRecognizer?.delegate = self
        
        SFSpeechRecognizer.requestAuthorization { (authStatus) in
            var isButtonEnabled = false
            
            switch authStatus {
            case .authorized:
                isButtonEnabled = true
            case .denied:
                isButtonEnabled = false
                print("用户拒绝访问语音识别")
            case .restricted:
                isButtonEnabled = false
                print("语音识别在这台设备上受到限制")
            case .notDetermined:
                isButtonEnabled = false
                print("语音识别未授权")
            @unknown default:
                fatalError()
            }
            
            OperationQueue.main.addOperation() {
                // 更新UI，启用或禁用语音转文字按钮
                // button.isEnabled = isButtonEnabled
            }
        }
    }

    @IBAction func startRecording(_ sender: UIButton) {
        if audioEngine.isRunning {
            audioEngine.stop()
            recognitionRequest?.endAudio()
            sender.isEnabled = false
            sender.setTitle("开始录音", for: .normal)
        } else {
            startRecording()
            sender.setTitle("停止录音", for: .normal)
        }
    }

    func startRecording() {
        if recognitionTask != nil {
            recognitionTask?.cancel()
            recognitionTask = nil
        }

        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setCategory(.record, mode: .measurement, options: .duckOthers)
            try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
        } catch {
            print("设置音频会话失败：\(error)")
        }

        recognitionRequest = SFSpeechAudioBufferRecognitionRequest()

        let inputNode = audioEngine.inputNode
        guard let recognitionRequest = recognitionRequest else {
            fatalError("无法创建语音识别请求对象")
        }

        recognitionRequest.shouldReportPartialResults = true

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

            if let result = result {
                // 获取识别到的文本结果
                let transcription = result.bestTranscription.formattedString
                print("识别结果：\(transcription)")
                isFinal = result.isFinal
            }

            if error != nil || isFinal {
                self.audioEngine.stop()
                inputNode.removeTap(onBus: 0)

                self.recognitionRequest = nil
                self.recognitionTask = nil

                self.startButton.isEnabled = true
            }
        })

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

        audioEngine.prepare()

        do {
            try audioEngine.start()
        } catch {
            print("启动音频引擎失败：\(error)")
        }
    }
}