如何获得iOS 7 AVSpeechOutrance文本到语音的差异语言代码？

我想使用iOS 7新的语音合成API，我的应用程序本地化为法语和英语、德语、日语等。我想设置语言代码来阅读文本。如何获取语言代码

utterance.voice = [AVSpeechSynthesisVoice voiceWithLanguage:@"en-ZA"];

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您可以设置以下其中一种语言：

 for (AVSpeechSynthesisVoice *voice in [AVSpeechSynthesisVoice speechVoices]) {
            NSLog(@" %@", voice.language);
        }

或使用默认区域设置：

AVSpeechSynthesizer *synthesizer = [[AVSpeechSynthesizer alloc] init];
AVSpeechUtterance *utterance = [AVSpeechUtterance speechUtteranceWithString:@"Localized -text"];
 utterance.rate = AVSpeechUtteranceMinimumSpeechRate; // Tell it to me slowly
[synthesizer speakUtterance:utterance];

更新

以下是支持的语言列表：

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
Hebrew (Israel) - he-IL
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

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SWIFT 3更新：

import AVFoundation

（检查语言代码）：

然后：

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好的，谢谢tonymkenu，我如何识别voice.language对应的城市或语言名称更多信息：谢谢tonymkenu…是否可以添加自定义语言？至少现在。。。我还没有找到任何线索。很高兴帮助你！：）有没有什么语言可以让你同时选择男声或女声？

for voice in (AVSpeechSynthesisVoice.speechVoices()){
        print(voice.language)
    }

let speakTalk   = AVSpeechSynthesizer()
let speakMsg    = AVSpeechUtterance(string: "Hello World, I can speak")

speakMsg.voice  = AVSpeechSynthesisVoice(language: "en-US")
speakMsg.pitchMultiplier = 1.2
speakMsg.rate   = 0.5

speakTalk.speak(speakMsg)