Question

我使用下面的代码在随机时间阅读随机句子。但是，我遇到了一个问题，即在AVSpeechSynthesizer仍在说前一个句子的同时调用一个随机句子来朗读时，第二个句子却没有被说出来。我要问的是，第一句话说完之后，如何才能说第二句话？

任何导入将不胜感激。干杯

这里是我的代码：

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)
}


}

Answer 1

您只需为此使用AVSpeechSynthesizerDelegate，就可以从代码中删除计时器。

要首先使用AVSpeechSynthesizerDelegate，您需要使用AVSpeechSynthesizerDelegate确认视图控制器，如下所示：

class ViewController: UIViewController, AVSpeechSynthesizerDelegate {

接下来的事情是您需要添加

synthesizer.delegate = self

在您的viewDidLoad方法中。您需要声明

let synthesizer = AVSpeechSynthesizer()

方法外和类内。

您可以使用randomElement属性从string数组中查找随机元素。

您的最终代码如下：

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：

由于您仅使用数组中的4个元素，因此当您为它随机字符串时，有可能多次重复相同的句子，因此您可以在此处添加一个更多的逻辑来防止重复此句子。

如下更新您的speakToMe函数：

@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)
}

然后在函数外部声明var previousStr = ""。

添加新的语音字符串时，AVSpeechSynthesizer不起作用[xcode-swift 4]

1 个答案: