Swift文本到语音转换

Question

我有一个不工作的代码块，但也没有给我一个运行时错误。演讲者没有讲话。

let synth = AVSpeechSynthesizer()
var myUtterance = AVSpeechUtterance(string: audioTextField.text)
myUtterance.rate = 0.3
synth.speak(myUtterance)

有没有什么我遗漏的代码，或者是别的什么？如果能帮上忙，我们将不胜感激。

编辑:它在任何@IBActions中都不工作，但在视图的加载函数中工作得很好……

override func viewDidLoad() {
    super.viewDidLoad()
    speechRecognizer?.delegate = self
    timer = Timer.scheduledTimer(timeInterval: 1.0, target: self, selector: #selector(tick), userInfo: nil, repeats: true)
    tick()
    requestSpeechAuth()
//WORKS HERE
}

@IBAction func audioButtonPressed(_ sender: Any) {
//DOESN"T WORK HERE    
    if isRecording {
        stopRecording()
    } else {
        startRecording()
    }
}

Answer 1

这段代码工作正常(来自Apple文档)

let string = "Hello, World!"
let utterance = AVSpeechUtterance(string: string)
utterance.voice = AVSpeechSynthesisVoice(language: "en-US")

let synth = AVSpeechSynthesizer()
synth.speak(utterance)

记住要导入AVFoundation

import AVFoundation