如何在React Native中的类外部访问类的状态变量？

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

const MyComponent = () => {
  const [count, setCount] = useState(0);
  const countRef = useRef(count);

  const updateCount = () => {
    countRef.current = countRef.current + 1;
  };

  return (
    <View>
      <Text>Count: {count}</Text>
      <Button title="Update Count" onPress={() => {
        setCount(count + 1);
        updateCount();
      }} />
    </View>
  );
};

export default MyComponent;