React Native:如何查看登录状态？

import React, { useState } from 'react';
import { View, Text, Button } from 'react-native';

const App = () => {
  const [isLoggedIn, setIsLoggedIn] = useState(false);

  const handleLogin = () => {
    // 调用登录接口，成功后更新登录状态为true
    setIsLoggedIn(true);
  };

  const handleLogout = () => {
    // 调用注销接口，成功后更新登录状态为false
    setIsLoggedIn(false);
  };

  return (
    <View>
      {isLoggedIn ? (
        <View>
          <Text>已登录</Text>
          <Button title="注销" onPress={handleLogout} />
        </View>
      ) : (
        <View>
          <Text>未登录</Text>
          <Button title="登录" onPress={handleLogin} />
        </View>
      )}
    </View>
  );
};

export default App;