BlueWallet/screen/settings/language.js

import React, { Component } from 'react';
import { FlatList, TouchableOpacity } from 'react-native';
import { BlueLoading, BlueText, SafeBlueArea, BlueListItem, BlueCard, BlueNavigationStyle } from '../../BlueComponents';
import PropTypes from 'prop-types';
import { Icon } from 'react-native-elements';
let loc = require('../../loc');

export default class Language extends Component {
  static navigationOptions = () => ({
    ...BlueNavigationStyle(),
    title: loc.settings.language,
  });

  constructor(props) {
    super(props);
    this.state = {
      isLoading: true,
      language: loc.getLanguage(),
      availableLanguages: [
        { label: 'English', value: 'en' },
        { label: 'Česky (CZ)', value: 'cs_cz' },
        { label: 'Danish (DK)', value: 'da_dk' },
        { label: 'Deutsch (DE)', value: 'de_de' },
        { label: 'Dutch (NL)', value: 'nl_nl' },
        { label: 'Français (FR)', value: 'fr_fr' },
        { label: 'Portuguese (BR)', value: 'pt_br' },
        { label: 'Portuguese (PT)', value: 'pt_pt' },
        { label: 'Русский', value: 'ru' },
        { label: 'Spanish', value: 'es' },
        { label: 'Thai (TH)', value: 'th_th' },
        { label: 'Українська', value: 'ua' },
      ],
    };
  }

  async componentDidMount() {
    this.setState({
      isLoading: false,
    });
  }

  renderItem = ({ item }) => {
    return (
      <TouchableOpacity
        onPress={() => {
          console.log('setLanguage', item.value);
          loc.setLanguage(item.value);
          loc.saveLanguage(item.value);
          return this.setState({ language: item.value });
        }}
      >
        <BlueListItem
          title={item.label}
          {...(this.state.language === item.value
            ? {
                rightIcon: <Icon name="check" type="font-awesome" color="#0c2550" />,
              }
            : { hideChevron: true })}
        />
      </TouchableOpacity>
    );
  };

  render() {
    if (this.state.isLoading) {
      return <BlueLoading />;
    }

    return (
      <SafeBlueArea forceInset={{ horizontal: 'always' }} style={{ flex: 1 }}>
        <FlatList
          style={{ flex: 1 }}
          keyExtractor={(_item, index) => `${index}`}
          data={this.state.availableLanguages}
          extraData={this.state.availableLanguages}
          renderItem={this.renderItem}
        />
        <BlueCard>
          <BlueText>When selecting a new language, restarting Blue Wallet may be required for the change to take effect.</BlueText>
        </BlueCard>
      </SafeBlueArea>
    );
  }
}

Language.propTypes = {
  navigation: PropTypes.shape({
    navigate: PropTypes.func,
    goBack: PropTypes.func,
  }),
};