ios - 有没有办法将 AVSpeechBoundary 设置为某个值或者在句子完成之后？

Question

我想暂停语音，它必须完成它正在说出的当前句子然后它必须暂停，但 API 只提供两种暂停类型立即和单词不是当前句子。我试过了，

 myutterance = AVSpeechUtterance(string:readTextView.text)

 synth .speak(myutterance)

 synth .pauseSpeaking(at: AVSpeechBoundary.immediate)

但它在文本完成后立即暂停。

Answer 1

我只是尝试了你所做的一切，它读完了整个句子，没有足够的停顿，

let someText = "Some Sample text. That will read and pause after every sentence"

let speechSynthesizer = AVSpeechSynthesizer()

let myutterance = AVSpeechUtterance(string:someText)

speechSynthesizer .speak(myutterance)

//Normal reading without pause
speechSynthesizer .pauseSpeaking(at: AVSpeechBoundary.immediate)

要在每个句子后暂停，您可以将整个文本分解为简单的组件，并使用 postUtteranceDelay 属性在如下循环中单独阅读它们。

//To pause after every sentence
let components = someText.components(separatedBy: ".")

for str in components{

    let myutterance = AVSpeechUtterance(string:str)

    speechSynthesizer .speak(myutterance)

    myutterance.postUtteranceDelay = 1 //Set it to whatever value you would want.
}

要在完成当前所说的句子后暂停，我们需要做一个小改动，

var isPaused:Bool = false
let someText = "Some Sample text. That will read and pause after every sentence. The next sentence should'nt be heard if you had pressed the pause button. Let us try this."
let speechSynthesizer = AVSpeechSynthesizer()
var currentUtterance:AVSpeechUtterance?

override func viewDidLoad() {
    super.viewDidLoad()
    speechSynthesizer.delegate = self
}

@IBAction func startSpeaking(_ sender: Any) {

    //Pause after every sentence
    let components = someText.components(separatedBy: ".")

    for str in components{

        let myutterance = AVSpeechUtterance(string:str)

        speechSynthesizer .speak(myutterance)

        myutterance.postUtteranceDelay = 1
    }
}

@IBAction func pauseSpeaking(_ sender: Any) {
    isPaused = !isPaused
}

func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance){
    print("location\(characterRange.location)")
    print("Range + Length\(characterRange.location + characterRange.length)")
    print("currentUtterance!.speechString\(currentUtterance!.speechString)")
    print("currentUtterance!.count\(currentUtterance!.speechString.characters.count)")

    if isPaused && (characterRange.location + characterRange.length) == currentUtterance!.speechString.characters.count{
        speechSynthesizer.stopSpeaking(at:.word)
    }

}

func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance){
    currentUtterance = utterance
}