状态在react-native redux中未定义

// 导入必要的库
import React from 'react';
import { createStore } from 'redux';
import { Provider, connect } from 'react-redux';

// 定义初始状态
const initialState = {
  count: 0,
};

// 定义Redux reducer
const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'INCREMENT':
      return { ...state, count: state.count + 1 };
    case 'DECREMENT':
      return { ...state, count: state.count - 1 };
    default:
      return state;
  }
};

// 创建Redux store
const store = createStore(reducer);

// 定义一个简单的计数器组件
const Counter = ({ count, increment, decrement }) => (
  <div>
    <p>Count: {count}</p>
    <button onClick={increment}>Increment</button>
    <button onClick={decrement}>Decrement</button>
  </div>
);

// 将Redux状态映射到组件的props中
const mapStateToProps = (state) => ({
  count: state.count,
});

// 定义操作Redux状态的函数，并将其映射到组件的props中
const mapDispatchToProps = (dispatch) => ({
  increment: () => dispatch({ type: 'INCREMENT' }),
  decrement: () => dispatch({ type: 'DECREMENT' }),
});

// 使用connect函数连接组件和Redux状态
const ConnectedCounter = connect(mapStateToProps, mapDispatchToProps)(Counter);

// 渲染应用程序
const App = () => (
  <Provider store={store}>
    <ConnectedCounter />
  </Provider>
);

export default App;