iOS-AVSpeechSynthesizer語音合成

iOS中的AVSpeechSynthesizer可以很輕鬆的實現實現文本到語音的功能，基本代碼如下:

self.speechSynthesizer = [[AVSpeechSynthesizer alloc] init];
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"FlyElephant"];

AVSpeechSynthesisVoice *voiceType = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-US"];
utterance.voice = voiceType;
//設置語速
utterance.rate *= 0.5;
//設置音量
utterance.volume = 0.6;

[self.speechSynthesizer speakUtterance:utterance];

AVSpeechUtterance可以設置對應的語言，如果設置的語言不能識別文本不能生成語音播放，蘋果支持的語言如下:

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)

以上就是蘋果支持的語言編碼，當然你也可以通過speechVoices遍歷對應的語言編碼:

NSArray *voice = [AVSpeechSynthesisVoice speechVoices];
    for (AVSpeechSynthesisVoice *voiceModel in voice) {
        NSLog(@"FlyElephant-%@",voiceModel);
    }