JSPM

import DeviceInfo from 'react-native-device-info'

import React, {
  AppRegistry,
  Component,
  StyleSheet,
  Text,
  View,
  StatusBarIOS,
  PixelRatio
} from 'react-native'
import CountryPicker, {
  getAllCountries
} from 'react-native-country-picker-modal'

const NORTH_AMERICA = ['CA', 'MX', 'US']

class Example extends Component {
  constructor(props) {
    StatusBarIOS.setHidden(true)
    super(props)
    let userLocaleCountryCode = DeviceInfo.getDeviceCountry()
    const userCountryData = getAllCountries()
      .filter(country => NORTH_AMERICA.includes(country.cca2))
      .filter(country => country.cca2 === userLocaleCountryCode)
      .pop()
    let callingCode = null
    let cca2 = userLocaleCountryCode
    if (!cca2 || !userCountryData) {
      cca2 = 'US'
      callingCode = '1'
    } else {
      callingCode = userCountryData.callingCode
    }
    this.state = {
      cca2,
      callingCode
    }
  }
  render() {
    return (
      <View style={styles.container}>
        <Text style={styles.welcome}>Welcome to Country Picker !</Text>
        <CountryPicker
          countryList={NORTH_AMERICA}
          onChange={value => {
            this.setState({ cca2: value.cca2, callingCode: value.callingCode })
          }}
          cca2={this.state.cca2}
          translation="eng"
        />
        <Text style={styles.instructions}>press on the flag</Text>
        {this.state.country && (
          <Text style={styles.data}>
            {JSON.stringify(this.state.country, null, 2)}
          </Text>
        )}
      </View>
    )
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center'
  },
  welcome: {
    fontSize: 20,
    textAlign: 'center',
    margin: 10
  },
  instructions: {
    fontSize: 12,
    textAlign: 'center',
    color: '#888',
    marginBottom: 5
  },
  data: {
    padding: 15,
    marginTop: 10,
    backgroundColor: '#ddd',
    borderColor: '#888',
    borderWidth: 1 / PixelRatio.get(),
    color: '#777'
  }
})

AppRegistry.registerComponent('example', () => Example)

import CountryPicker from 'react-native-country-picker-modal'

// change the import path according to your project structure
import closeImgLight from "/asset/iconWhite.png";

const DARK_COLOR = "#18171C";
const PLACEHOLDER_COLOR = "rgba(255,255,255,0.2)";
const LIGHT_COLOR = "#FFF";


export default (props) => (
  <CountryPicker
    filterPlaceholderTextColor={PLACEHOLDER_COLOR}
    closeButtonImage={closeImgLight}
    styles={darkTheme}
    {...props}
  />
);


const darkTheme = StyleSheet.create({
 modalContainer: {
    backgroundColor: DARK_COLOR
  },
  contentContainer: {
    backgroundColor: DARK_COLOR
  },
  header: {
    backgroundColor: DARK_COLOR
  },
  itemCountryName: {
    borderBottomWidth: 0
  },
  countryName: {
    color: LIGHT_COLOR
  },
  letterText: {
    color: LIGHT_COLOR
  },
  input: {
    color: LIGHT_COLOR,
    borderBottomWidth: 1,
    borderColor: LIGHT_COLOR
  }
});