Question

我正在关注iOS 10语音识别API（https://code.tutsplus.com/tutorials/using-the-speech-recognition-api-in-ios-10--cms-28032?ec_unit=translation-info-language）的一些教程而我的版本不起作用。语音输入没有文本响应。我遵循了本教程，但是我必须进行一些更改（显然，较新版本的Swift并不完全接受本教程中的某些代码行）。你们能给我一些关于如何以及为什么不起作用的想法吗？

这是我正在运行的方法：

func startRecording() {
    // Setup audio engine and speech recognizer
    let node = audioEngine.inputNode
    let recordingFormat = node.outputFormat(forBus: 0)
    node.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { buffer, _ in
        self.request.append(buffer)
    }

    // Prepare and start recording
    audioEngine.prepare()
    do {
        try audioEngine.start()
        self.status = .recognizing
    } catch {
        return print(error)
    }

    // Analyze the speech
    recognitionTask = speechRecognizer?.recognitionTask(with: request, resultHandler: { result, error in
        if let result = result {
            self.tview.text = result.bestTranscription.formattedString
            NSLog(result.bestTranscription.formattedString)
        } else if let error = error {
            print(error)
            NSLog(error.localizedDescription)
        }
    })
}

调试时，speechRecognizer或RecognitionTask都没有nil值。

这是我在ViewController上定义变量的方式：

let audioEngine = AVAudioEngine()
let speechRecognizer: SFSpeechRecognizer? = SFSpeechRecognizer()
let request = SFSpeechAudioBufferRecognitionRequest()
var recognitionTask: SFSpeechRecognitionTask?

工作设置：在2017 iPad，iOS 11.4上测试。 Xcode 9.4.1，Swift 4.1。

谢谢！

Answer 1

由于未将AVAudioSession设置为Record，导致此问题。试试这个。

在View Controller中添加

let audioSession = AVAudioSession.sharedInstance()

您的最终方法将是。

func startRecording() {
    //Change / Edit Start
    do {
        try audioSession.setCategory(AVAudioSessionCategoryRecord)
        try audioSession.setMode(AVAudioSessionModeMeasurement)
        try audioSession.setActive(true, with: .notifyOthersOnDeactivation)
    } catch {
        print("audioSession properties weren't set because of an error.")
    }
    //Change / Edit Finished
    // Setup audio engine and speech recognizer
    let node = audioEngine.inputNode
    let recordingFormat = node.outputFormat(forBus: 0)
    node.installTap(onBus: 0, bufferSize: 1024, format: recordingFormat) { buffer, _ in
        self.request.append(buffer)
    }

    // Prepare and start recording
    audioEngine.prepare()
    do {
        try audioEngine.start()
        self.status = .recognizing
    } catch {
        return print(error)
    }

    // Analyze the speech
    recognitionTask = speechRecognizer?.recognitionTask(with: request, resultHandler: { result, error in
        if let result = result {
            self.tview.text = result.bestTranscription.formattedString
            NSLog(result.bestTranscription.formattedString)
        } else if let error = error {
            print(error)
            NSLog(error.localizedDescription)
        }
    })
}

Answer 2

在现有代码中添加以下内容：

recognitionTask = speechRecognizer?.recognitionTask(with: request, resultHandler: { result, error in
    if let result = result, result.isFinal {
        self.tview.text = result.bestTranscription.formattedString
        NSLog(result.bestTranscription.formattedString)
    } else if let error = error {
        print(error)
        NSLog(error.localizedDescription)
    }
})

speechRecognizer没有返回答案

2 个答案: