是否可以在react原生中访问其他屏幕/函数中的变量？

// actions.js
export const updateVariable = (value) => ({
  type: 'UPDATE_VARIABLE',
  payload: value,
});

// reducer.js
const initialState = {
  variable: null,
};

export const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'UPDATE_VARIABLE':
      return { ...state, variable: action.payload };
    default:
      return state;
  }
};

// 在组件中使用
import { useSelector, useDispatch } from 'react-redux';
import { updateVariable } from './actions';

const ScreenA = () => {
  const dispatch = useDispatch();
  const variable = useSelector(state => state.variable);

  const handleChange = (value) => {
    dispatch(updateVariable(value));
  };

  return (
    // ...
  );
};

const ScreenB = () => {
  const variable = useSelector(state => state.variable);

  return (
    // ...
  );
};

// VariableContext.js
import React, { createContext, useState } from 'react';

export const VariableContext = createContext();

export const VariableProvider = ({ children }) => {
  const [variable, setVariable] = useState(null);

  return (
    <VariableContext.Provider value={{ variable, setVariable }}>
      {children}
    </VariableContext.Provider>
  );
};

// 在组件中使用
import { useContext } from 'react';
import { VariableContext } from './VariableContext';

const ScreenA = () => {
  const { variable, setVariable } = useContext(VariableContext);

  const handleChange = (value) => {
    setVariable(value);
  };

  return (
    // ...
  );
};

const ScreenB = () => {
  const { variable } = useContext(VariableContext);

  return (
    // ...
  );
};

// ParentComponent.js
import React, { useState } from 'react';
import ScreenA from './ScreenA';
import ScreenB from './ScreenB';

const ParentComponent = () => {
  const [variable, setVariable] = useState(null);

  return (
    <>
      <ScreenA setVariable={setVariable} />
      <ScreenB variable={variable} />
    </>
  );
};

// ScreenA.js
import React from 'react';

const ScreenA = ({ setVariable }) => {
  const handleChange = (value) => {
    setVariable(value);
  };

  return (
    // ...
  );
};

// ScreenB.js
import React from 'react';

const ScreenB = ({ variable }) => {
  return (
    // ...
  );
};

// 在ScreenA中
const ScreenA = ({ navigation }) => {
  const variable = 'someValue';

  const navigateToScreenB = () => {
    navigation.navigate('ScreenB', { variable });
  };

  return (
    // ...
  );
};

// 在ScreenB中
import { useRoute } from '@react-navigation/native';

const ScreenB = () => {
  const route = useRoute();
  const variable = route.params?.variable;

  return (
    // ...
  );
};

useEffect(() => {
  // 处理变量更新后的逻辑
}, [variable]);