react-native-tts

https://github.com/ak1394/react-native-tts#readme

yarn add react-native-tts      
cd ios/ && pod install && cd ..

  componentDidMount() {
    Tts.speak('Hello, world!');
    Tts.speak('Hello, world!', {
      iosVoiceId: 'com.apple.ttsbundle.Moira-compact',
      rate: 0.5,
    });
  }

發文當然要講中文啊 ٩(｡・ω・｡)و

    Tts.setDefaultLanguage('zh-TW');
    Tts.speak('發文發文發文發文發文發文發文發文!', {
      language: 'zh-TW', quality: 300 ,
      id: 'com.apple.ttsbundle.Samantha-compact', name: 'Samantha',
       rate: 0.5,
     });