iOS 7 TTS

AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"배가 부르니 일하기가 싫구나."];
utterance.rate = 0.25; // 0: 아주 느림, 0.5: 기본값, 1: 아주 빠름
utterance.pitchMultiplier = 1.25; // 숫자가 작아지면 굵은 목소리
utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"ko-KR"]; // 언어
AVSpeechSynthesizer *synth = [AVSpeechSynthesizer new];
[synth speakUtterance:utterance];

 

지원 가능 언어 목록

Arabic (Saudi Arabia) - ar-SA
Chinese (China) - zh-CN
Chinese (Hong Kong SAR China) - zh-HK
Chinese (Taiwan) - zh-TW
Czech (Czech Republic) - cs-CZ
Danish (Denmark) - da-DK
Dutch (Belgium) - nl-BE
Dutch (Netherlands) - nl-NL
English (Australia) - en-AU
English (Ireland) - en-IE
English (South Africa) - en-ZA
English (United Kingdom) - en-GB
English (United States) - en-US
Finnish (Finland) - fi-FI
French (Canada) - fr-CA
French (France) - fr-FR
German (Germany) - de-DE
Greek (Greece) - el-GR
Hindi (India) - hi-IN
Hungarian (Hungary) - hu-HU
Indonesian (Indonesia) - id-ID
Italian (Italy) - it-IT
Japanese (Japan) - ja-JP
Korean (South Korea) - ko-KR
Norwegian (Norway) - no-NO
Polish (Poland) - pl-PL
Portuguese (Brazil) - pt-BR
Portuguese (Portugal) - pt-PT
Romanian (Romania) - ro-RO
Russian (Russia) - ru-RU
Slovak (Slovakia) - sk-SK
Spanish (Mexico) - es-MX
Spanish (Spain) - es-ES
Swedish (Sweden) - sv-SE
Thai (Thailand) - th-TH
Turkish (Turkey) - tr-TR

출처 : http://useyourloaf.com/blog/2014/01/08/synthesized-speech-from-text.html