标题：React Native的优雅国家选择器：react-native-country-picker-modal

import React, { useState } from 'react';
import { View, Text, Button } from 'react-native';
import CountryPicker from 'react-native-country-picker';
 
const CountryPickerExample = () => {
  const [selectedCountry, setSelectedCountry] = useState('');
 
  return (
    <View>
      <CountryPicker
        onValueChange={(value) => setSelectedCountry(value)}
        selectedCountry={selectedCountry}
      />
      <Button
        title="选择国家"
        onPress={() => alert(`您选择了: ${selectedCountry}`)}
      />
    </View>
  );
};
 
export default CountryPickerExample;

这个例子展示了如何在React Native应用中使用react-native-country-picker-modal库来创建一个国家选择器，并在用户选择国家后弹出一个提示框显示选择的结果。这个例子简洁明了，并且使用了React Hooks来管理状态，这是目前在React Native中推荐的做法。