记录iOS 语音播报封装

需要实现 AVSpeechSynthesizerDelegate 代理

 // 设置一段文字播报的次数
    var speechNum : Int = 1
    // 记录播报次数
    var speechInit : Int = 0

    private var avSpeaker : AVSpeechSynthesizer!
    
    override init() {
        super.init()
        avSpeaker = AVSpeechSynthesizer()
        avSpeaker.delegate = self
        
    }
    
    /// 开始播报
    /// - Parameter content: 播报内容
    func startSpeech(content : String) {
        stopSpeech()
        let tempContent = configSpeechContent(content: content)
        let utterance = configUtterance(speechContent: tempContent)
        avSpeaker.speak(utterance)
        
    }
    
    
    /// 停止播报
    func stopSpeech() {
        avSpeaker.stopSpeaking(at: .immediate)
    }
    
    
    /// 暂停播报
    func pauseSpeech() {
        avSpeaker.pauseSpeaking(at: .immediate)
    }
    
    /// 继续播报
    func continueSpeech() {
        avSpeaker.continueSpeaking()
    }
    
    /// 初始化播报的语音文字
    /// - Parameter speechContent: 播报文字
    /// - Returns: AVSpeechUtterance
    func configUtterance(speechContent : String) -> AVSpeechUtterance {
        let utterance = AVSpeechUtterance(string: speechContent)
        // 设置语速
        utterance.rate = 0.4
        // 设置音高
        utterance.pitchMultiplier = 1
        // 设置音量
        utterance.volume = 1
        // 读一段话前停顿时间
        utterance.preUtteranceDelay = 0
        // 读完一段后的停顿时间
        utterance.postUtteranceDelay = 0
        // 设置声音 是 AVSpeechSynthesisVoice对象
        let voice = AVSpeechSynthesisVoice(language: "zh-CN")
        
        utterance.voice = voice
        return utterance
    }

    
    /// 这里做处理主要是不想在读多位数字时读成几百，几十这种类型
    /// 配置播报内容
    /// - Parameter content: 播报数据源
    /// - Returns: stirng
    func configSpeechContent(content : String) -> String{
        var speech = ""
        for charStr in content.enumerated() {
            speech = speech + " " + String(charStr.element)
        }
        return speech
    }
    
    
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) {
        
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didPause utterance: AVSpeechUtterance) {
        
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) {
        
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
        speechInit += 1
        if speechInit == speechNum {
            speechInit = 0
        } else {
            avSpeaker.speak(utterance)
        }
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didContinue utterance: AVSpeechUtterance) {
        
    }
    
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) {
    
    }