AVSpeechSynthesizer (语音播报)

标签： AVFoundation

---

AVSpeechSynthesizer

An object that produces synthesized speech from text utterances and provides controls for monitoring or controlling ongoing speech

AV Foundation中提供了一个AVSpeechSynthesizer类来向app中添加朗诵文本的功能.
这个类用来播放一个或者多个语音内容,每条语音内容都是一个AVSpeechUtterance对象.
(一个语音合成器(SpeechSynthesizer)播放需要一段文本内容(SpeechUtterance))

AVSpeechSynthesizer 常用函数

var speech : AVSpeechSynthesizer = AVSpeechSynthesizer.init()
speech.delegate = self

//播放
speech.speak(utterance)

//暂停(在某个位置暂停)
func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) {
        //代理获取当前语音播放位置
        range = characterRange
}
speech.pauseSpeaking(at: AVSpeechBoundary.init(rawValue: range.location)! )

//继续播放
speech.continueSpeaking()

//停止播放、取消播放
 speech.stopSpeaking(at: AVSpeechBoundary.immediate)

//判断当前播放状态
speech.isPaused
speech.isSpeaking

AVSpeechSynthesizerDelegate

   //开始播放
   func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didStart utterance: AVSpeechUtterance) {
    }
    
    //取消播放、停止播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didCancel utterance: AVSpeechUtterance) {
       
    }
    
    //暂停播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didPause utterance: AVSpeechUtterance) {
    }
    
    //继续播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didContinue utterance: AVSpeechUtterance) {
    }
    
    //结束播放
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, didFinish utterance: AVSpeechUtterance) {
    }
    
    //播放轮询，获取当前播放位置
    func speechSynthesizer(_ synthesizer: AVSpeechSynthesizer, willSpeakRangeOfSpeechString characterRange: NSRange, utterance: AVSpeechUtterance) {

    }

AVSpeechUtterance（语音内容对象）

//根据文本初始化
let utterance = AVSpeechUtterance.init(string: "你好，我是语音播放器")
//播放速率（// 数值在 AVSpeechUtteranceMinimumSpeechRate 和 AVSpeechUtteranceMaximumSpeechRate 区间）
utterance.rate = 0.4
//播放语言
utterance.voice = AVSpeechSynthesisVoice.init(language: "zh-CN")
//播放前的过渡时间
utterance.preUtteranceDelay = 0.5
//播放结束的过渡时间
utterance.postUtteranceDelay = 0.5

AVSpeechSynthesisVoice（语音语言）

AVSpeechSynthesisVoice.init(language: "zh-CN")

• Arabic (ar-SA)
• Chinese (zh-CN, zh-HK, zh-TW)
• Czech (cs-CZ)
• Danish (da-DK)
• Dutch (nl-BE, nl-NL)
• English (en-AU, en-GB, en-IE, en-US, en-ZA)
• Finnish (fi-FI)
• French (fr-CA, fr-FR)
• German (de-DE)
• Greek (el-GR)
• Hebrew (he-IL)
• Hindi (hi-IN)
• Hungarian (hu-HU)
• Indonesian (id-ID)
• Italian (it-IT)
• Japanese (ja-JP)
• Korean (ko-KR)
• Norwegian (no-NO)
• Polish (pl-PL)
• Portuguese (pt-BR, pt-PT)
• Romanian (ro-RO)
• Russian (ru-RU)
• Slovak (sk-SK)
• Spanish (es-ES, es-MX)
• Swedish (sv-SE)
• Thai (th-TH)
• Turkish (tr-TR)

参考链接：AVSpeechSynthesizer