AVSpeechSynthesizer在添加新字符串以进行语音时不工作[xcode-swift 4]

我用下面的代码在随机时间读随机的句子。 然而，我遇到了一个问题，当一个随机的句子被调用来阅读，而前一个句子仍然由AVSpeechSynthesizer说出，使得第二个句子不被说出。我想问的是，在第一句话说完后，我如何才能让第二句话被说出来

任何进口商品都将不胜感激。 干杯

这是我的密码：

import UIKit
import AVFoundation


class ViewController: UIViewController {

var myTimer = Timer()
   let string = ["what kind of car do you have?", "do you like the beach?","did you bring a towel?","There are big waves today"]
var randomTimer = Int()


@objc func speakToMe(){

    let random = Int.random(in: 0...3)
    randomTimer = Int.random(in: 0...2)
    print(randomTimer)
    print(string[random])


let utterance = AVSpeechUtterance(string: string[random])
utterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
utterance.rate = 0.1
let synthesizer = AVSpeechSynthesizer()
synthesizer.speak(utterance)

}

override func viewDidLoad() {
    super.viewDidLoad()
    speakToMe()
    myTimer = Timer.scheduledTimer(timeInterval: TimeInterval(randomTimer), target: self, selector: #selector(ViewController.speakToMe), userInfo: nil, repeats: true)
}


}   

---

您只需使用

avspeechsynthezerdelegate

，就可以从代码中删除计时器

要使用

avspeechsynthezerdelegate

首先需要使用

avspeechsynthezerdelegate

确认视图控制器，如下所示：

class ViewController: UIViewController, AVSpeechSynthesizerDelegate {

下一件事是您需要添加

synthesizer.delegate = self

在

viewDidLoad

方法中。你需要申报

let synthesizer = AVSpeechSynthesizer()

方法外部和类内部

您可以使用

randomElement

属性从

string

数组中查找随机元素

最终的代码如下所示：

import UIKit
import AVFoundation

class ViewController: UIViewController, AVSpeechSynthesizerDelegate {

    let string = ["what kind of car do you have?", "do you like the beach?","did you bring a towel?","There are big waves today"]
    let synthesizer = AVSpeechSynthesizer()

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

    @objc func speakToMe(){

        let utterance = AVSpeechUtterance(string: string.randomElement()!)
        utterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
        utterance.rate = 0.1
        synthesizer.speak(utterance)

    }

    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        speakToMe()
    }
}

编辑：

由于数组中只使用了4个元素，所以当您使用随机字符串时，可能会多次重复同一个句子，因此您可以在此处添加一个逻辑来防止它

更新您的

speakToMe

功能，如下所示：

@objc func speakToMe(){

    var randomStr = string.randomElement()!
    while previousStr == randomStr {
        randomStr = string.randomElement()!
    }
    previousStr = randomStr
    let utterance = AVSpeechUtterance(string: randomStr)
    utterance.voice = AVSpeechSynthesisVoice(language: "en-GB")
    utterance.rate = 0.1
    synthesizer.speak(utterance)
}

并在函数外部声明

var previousStr=”“