ios swift 通知中的文本到语音

Question

我在 ios swift 中开发了一个应用程序。 数据来自推送通知。 在通知负载中，有一个用于播放的文本。 我通过AVSpeechSynthesizer播放文本到语音，但我想播放 2,3 次它只播放一次。 请帮我解决这个问题。 在此先感谢。这是代码

func textToSpeechWithMessage(message:String, _ languageCode:String)
    {
        
        let synthesizer = AVSpeechSynthesizer()
        
        let audioSession = AVAudioSession.sharedInstance()
        
        print("Activating audio session")
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
            
            try audioSession.setActive(true)
            UIApplication.shared.beginReceivingRemoteControlEvents()
            
            let utterance = AVSpeechUtterance(string:message)
            utterance.rate = 0.5
            utterance.volume = 0.8
            utterance.voice = AVSpeechSynthesisVoice(language: languageCode)
            synthesizer.speak(utterance)

            
        } catch {
            print("Unable to set audio session category: %@", error)
        }
    }

Answer 1

为此，您需要：

1. 使您的 class 符合AVSpeechSynthesizerDelegate协议。
2. 实现the speechSynthesizer(_:didFinish:)方法。
3. 在最后一个演讲结束后重复演讲，随心所欲。

像这样的东西：

    private let synthesizer = AVSpeechSynthesizer()
    private let audioSession = AVAudioSession.sharedInstance()
    private var repeatCount = 3
    private var currentCount = 0
    private var message = ""
    private var languageCode = ""

    func repeatTextToSpeach(with message: String, languageCode: String, repeatCount: Int) {
        self.synthesizer.delegate = self
        self.message = message
        self.repeatCount = repeatCount
        self.languageCode = languageCode
        self.currentCount = 0
        self.speak()
    }

    func speak() {
        do {
            try AVAudioSession.sharedInstance().setCategory(AVAudioSession.Category.playback)
            try audioSession.setActive(true)

            UIApplication.shared.beginReceivingRemoteControlEvents()
            
            let utterance = AVSpeechUtterance(string: message)
            utterance.rate = 0.5
            utterance.volume = 0.8
            utterance.voice = AVSpeechSynthesisVoice(language: languageCode)

            synthesizer.speak(utterance)
            currentCount += 1
        } catch {
            print("Unable to set audio session category: %@", error)
        }
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        if currentCount < repeatCount {
            speak()
        }
    }

并像这样开始重复的演讲：

repeatTextToSpeach(with: "Text to speech from notification in ios swift", languageCode: "en-US", repeatCount: 3)