识别语音转文字Swift

Question

是否可以使用自定义键盘识别语音并将其转换为文本，例如 iPhone 中的默认消息应用程序。

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1. iPhone 键盘中默认识别语音。

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2. 语音转文本

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非常感谢您的帮助。

提前致谢。

- Sham Dhiman

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相关 https://stackoverflow.com/questions/44365523/can-we-incorporate-the-speech-recognition-framework-with-today-extension/44365619 - ielyamani

Answer 1

我有以下代码，用于将语音转换成文本，这些代码用在我的示例应用程序中。

import UIKit
import Speech
import AVKit

class ViewController: UIViewController {

    //------------------------------------------------------------------------------
    // MARK:-
    // MARK:- Outlets
    //------------------------------------------------------------------------------

    @IBOutlet weak var btnStart             : UIButton!
    @IBOutlet weak var lblText              : UILabel!


    //------------------------------------------------------------------------------
    // MARK:-
    // MARK:- Variables
    //------------------------------------------------------------------------------

    let speechRecognizer        = SFSpeechRecognizer(locale: Locale(identifier: "en-US"))

    var recognitionRequest      : SFSpeechAudioBufferRecognitionRequest?
    var recognitionTask         : SFSpeechRecognitionTask?
    let audioEngine             = AVAudioEngine()


    //------------------------------------------------------------------------------
    // MARK:-
    // MARK:- Action Methods
    //------------------------------------------------------------------------------

    @IBAction func btnStartSpeechToText(_ sender: UIButton) {

        if audioEngine.isRunning {
            self.audioEngine.stop()
            self.recognitionRequest?.endAudio()
            self.btnStart.isEnabled = false
            self.btnStart.setTitle("Start Recording", for: .normal)
        } else {
            self.startRecording()
            self.btnStart.setTitle("Stop Recording", for: .normal)
        }
    }


    //------------------------------------------------------------------------------
    // MARK:-
    // MARK:- Custom Methods
    //------------------------------------------------------------------------------

    func setupSpeech() {

        self.btnStart.isEnabled = false
        self.speechRecognizer?.delegate = self

        SFSpeechRecognizer.requestAuthorization { (authStatus) in

            var isButtonEnabled = false

            switch authStatus {
            case .authorized:
                isButtonEnabled = true

            case .denied:
                isButtonEnabled = false
                print("User denied access to speech recognition")

            case .restricted:
                isButtonEnabled = false
                print("Speech recognition restricted on this device")

            case .notDetermined:
                isButtonEnabled = false
                print("Speech recognition not yet authorized")
            }

            OperationQueue.main.addOperation() {
                self.btnStart.isEnabled = isButtonEnabled
            }
        }
    }

    //------------------------------------------------------------------------------

    func startRecording() {

        // Clear all previous session data and cancel task
        if recognitionTask != nil {
            recognitionTask?.cancel()
            recognitionTask = nil
        }

        // Create instance of audio session to record voice
        let audioSession = AVAudioSession.sharedInstance()
        do {
            try audioSession.setCategory(AVAudioSession.Category.record, mode: AVAudioSession.Mode.measurement, options: AVAudioSession.CategoryOptions.defaultToSpeaker)
            try audioSession.setActive(true, options: .notifyOthersOnDeactivation)
        } catch {
            print("audioSession properties weren't set because of an error.")
        }

        self.recognitionRequest = SFSpeechAudioBufferRecognitionRequest()

        let inputNode = audioEngine.inputNode

        guard let recognitionRequest = recognitionRequest else {
            fatalError("Unable to create an SFSpeechAudioBufferRecognitionRequest object")
        }

        recognitionRequest.shouldReportPartialResults = true

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

            var isFinal = false

            if result != nil {

                self.lblText.text = result?.bestTranscription.formattedString
                isFinal = (result?.isFinal)!
            }

            if error != nil || isFinal {

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

                self.recognitionRequest = nil
                self.recognitionTask = nil

                self.btnStart.isEnabled = true
            }
        })

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

        self.audioEngine.prepare()

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

        self.lblText.text = "Say something, I'm listening!"
    }


    //------------------------------------------------------------------------------
    // MARK:-
    // MARK:- View Life Cycle Methods
    //------------------------------------------------------------------------------

    override func viewDidLoad() {
        super.viewDidLoad()
        self.setupSpeech()
    }
}


//------------------------------------------------------------------------------
// MARK:-
// MARK:- SFSpeechRecognizerDelegate Methods
//------------------------------------------------------------------------------

extension ViewController: SFSpeechRecognizerDelegate {

    func speechRecognizer(_ speechRecognizer: SFSpeechRecognizer, availabilityDidChange available: Bool) {
        if available {
            self.btnStart.isEnabled = true
        } else {
            self.btnStart.isEnabled = false
        }
    }
}

我已经为上述 ViewController 的 UI 附加了以下截图。

- Mayur Karmur

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谢谢您的回复，但是先生，我想要这项工作在自定义键盘中完成，而不是在按钮中。 - Sham Dhiman

所以，这段代码需要在自定义键盘扩展中使用。 - Mayur Karmur

@SamkitShah，是的，它会，但请确保您的计算机有语音输入/输出设备。 - Mayur Karmur

最好的简单和短 - singh.jitendra

这个有 SwiftUI 版本吗？我想试一下。 - Daryl Wong

对我来说非常出色的工作…… - M Hamayun zeb