AVFoundation 框架，是 iOS 和 OS X 应用的视听处理的框架技术。
朗读功能涉及到 AVFoundation 框架中 AVSpeechSynthesizer、AVSpeechSynthesisVoice、AVSpeechUtterance 等类。
功能：实现朗读一段文字
- 创建合成器
- 创建朗读内容以及其他配置信息
- 朗读
为了实现这个功能，大概需要以上三个步骤
- 创建合成器
// 创建 AVSpeechSynthesizer 对象
AVSpeechSynthesizer *speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
- 创建朗读内容以及其他配置信息
// 根据朗读内容，创建朗读表达对象
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:string];
// 设置朗读语言
utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:self.speechConfigure.language];
// 音量
utterance.volume= self.speechConfigure.volume;
// 语速
utterance.rate = self.speechConfigure.rate;
// 下一段朗读延时时间
utterance.postUtteranceDelay = self.speechConfigure.postUtteranceDelay;
// 语调
utterance.pitchMultiplier =self.speechConfigure.pithMutiplier;
- 朗读
[speechSynthesizer speakUtterance:utterance];
此外，还可以停止/暂停朗读
// AVSpeechBoundaryWord 自我感觉是当前单词或文字读完结束
// AVSpeechBoundaryImmediate 不管当前单词或文字有没有读完都立即结束
[self.speechSynthesizerstopSpeakingAtBoundary:ASpeechBoundaryWord];
// AVSpeechBoundaryWord 自我感觉是当前单词或文字读完结束
// AVSpeechBoundaryImmediate 不管当前单词或文字有没有读完都立即结束
[self.speechSynthesizerpausSpeakingAtBoundary:VSpeechBundaryWord];
最后再提供部分苹果支持的语言
"[AVSpeechSynthesisVoice 0x978a0b0] Language: th-TH",
"[AVSpeechSynthesisVoice 0x977a450] Language: pt-BR",
"[AVSpeechSynthesisVoice 0x977a480] Language: sk-SK",
"[AVSpeechSynthesisVoice 0x978ad50] Language: fr-CA",
"[AVSpeechSynthesisVoice 0x978ada0] Language: ro-RO",
"[AVSpeechSynthesisVoice 0x97823f0] Language: no-NO",
"[AVSpeechSynthesisVoice 0x978e7b0] Language: fi-FI",
"[AVSpeechSynthesisVoice 0x978af50] Language: pl-PL",
"[AVSpeechSynthesisVoice 0x978afa0] Language: de-DE",
"[AVSpeechSynthesisVoice 0x978e390] Language: nl-NL",
"[AVSpeechSynthesisVoice 0x978b030] Language: id-ID",
"[AVSpeechSynthesisVoice 0x978b080] Language: tr-TR",
"[AVSpeechSynthesisVoice 0x978b0d0] Language: it-IT",
"[AVSpeechSynthesisVoice 0x978b120] Language: pt-PT",
"[AVSpeechSynthesisVoice 0x978b170] Language: fr-FR",
"[AVSpeechSynthesisVoice 0x978b1c0] Language: ru-RU",
"[AVSpeechSynthesisVoice 0x978b210] Language: es-MX",
"[AVSpeechSynthesisVoice 0x978b2d0] Language: zh-HK",中文(香港)粤语
"[AVSpeechSynthesisVoice 0x978b320] Language: sv-SE",
"[AVSpeechSynthesisVoice 0x978b010] Language: hu-HU",
"[AVSpeechSynthesisVoice 0x978b440] Language: zh-TW",中文(台湾)
"[AVSpeechSynthesisVoice 0x978b490] Language: es-ES",
"[AVSpeechSynthesisVoice 0x978b4e0] Language: zh-CN",中文(普通话)
"[AVSpeechSynthesisVoice 0x978b530] Language: nl-BE",
"[AVSpeechSynthesisVoice 0x978b580] Language: en-GB",英语(英国)
"[AVSpeechSynthesisVoice 0x978b5d0] Language: ar-SA",
"[AVSpeechSynthesisVoice 0x978b620] Language: ko-KR",
"[AVSpeechSynthesisVoice 0x978b670] Language: cs-CZ",
"[AVSpeechSynthesisVoice 0x978b6c0] Language: en-ZA",
"[AVSpeechSynthesisVoice 0x978aed0] Language: en-AU",
"[AVSpeechSynthesisVoice 0x978af20] Language: da-DK",
"[AVSpeechSynthesisVoice 0x978b810] Language: en-US",英语(美国)
"[AVSpeechSynthesisVoice 0x978b860] Language: en-IE",
"[AVSpeechSynthesisVoice 0x978b8b0] Language: hi-IN",
"[AVSpeechSynthesisVoice 0x978b900] Language: el-GR",
"[AVSpeechSynthesisVoice 0x978b950] Language: ja-JP"
