这是平台特定的功能，你不能从React Native更改，你只能读取这些数据并根据这些设置更改你的应用程序语言。例如https://gitlab.com/os-team/libs/utils/-/tree/master/packages/i18next-react-native-language-detector

import { LanguageDetectorModule } from 'i18next';
import { Platform, NativeModules } from 'react-native';

const RNLanguageDetector: LanguageDetectorModule = {
  type: 'languageDetector',
  init: () => {},
  detect: () => {
    const locale =
      Platform.OS === 'ios'
        ? NativeModules.SettingsManager.settings.AppleLocale ||
          NativeModules.SettingsManager.settings.AppleLanguages[0] // iOS 13
        : NativeModules.I18nManager.localeIdentifier;
    return locale.split('_')[0];
  },
  cacheUserLanguage: () => {},
};

export default RNLanguageDetector;

要在应用中设置语言环境列表，您需要将其添加到Xcode中

在Expo中，您可以通过执行此操作来显示应用的此设置。
在app.json或app.config.js中，将这些属性添加到infoPlist属性中
示例：-

{
"expo":{
  "ios": {
      "infoPlist": {
        "CFBundleAllowMixedLocalizations": true,
        "CFBundleLocalizations": ["en", "ar"],//add in this array the languages that your app supports
        "CFBundleDevelopmentRegion": "en"
      }
    },
  }
}

并在expo属性下添加区域设置路径。
完整示例：-

{
"expo":{
"locales": {
      "en": "./locale/en.json",
      "ar": "./locale/ar.json"
    },
  "ios": {
      "infoPlist": {
        "CFBundleAllowMixedLocalizations": true,
        "CFBundleLocalizations": ["en", "ar"],//add in this array the languages that your app supports
        "CFBundleDevelopmentRegion": "en"
      }
    },
  }
}

• 注意：此解决方案将在构建后在您的应用程序上工作，并且语言选项不会在Expo go上显示，因为它仅支持英语 *