React Native Redux State不是持久的

Question

我正在使用react本地反应原生导航。当我从第一页移到第二页时，我的状态变化不会持久。

App.js

import React from 'react';
import { createStackNavigator } from 'react-navigation';
import { Provider } from 'react-redux';

import Home from './home/home';
import Recommend from './recommend/recommend';
import store from '../redux/store';

const RootStack = createStackNavigator(
  {
    Home: { screen: Home },
    Recommend: { screen: Recommend }
  },
  {
    initialRouteName: 'Home',
  }
);

export default class App extends React.Component {
  render() {
    return (
      <Provider store={store}>
          <RootStack />
      </Provider>
    );
  }
}

reduer：

import { combineReducers } from 'redux';

import { DATA_AVAILABLE, UPDATE_PREFERANCE } from '../actions/index';

const dataState = { data: { college: 'ABC', major: '123' } };

const dataReducer = (state = dataState, action) => {
    switch (action.type) {
        case DATA_AVAILABLE:
            state = Object.assign({}, state);
            return state;
        case UPDATE_PREFERANCE:
            console.log('update pref');
            return {
              ...state,
              data: {
                college: action.payload.collegeName,
                major: action.payload.majorName
              }
            }
        default:
            return state;
    }
};

const rootReducer = combineReducers({
    dataReducer
});

export default rootReducer;

主页组件：

import React, { Component } from 'react';
import {
  Container,
  Header,
  Title,
  Content,
  Text,
  Button,
  Icon,
  Footer,
  FooterTab,
  Left,
  Right,
  Item,
  Input,
  View,
  Picker
} from 'native-base';

import { bindActionCreators } from 'redux';
import { connect } from 'react-redux';

import styles from './style';
import * as Actions from '../../redux/actions/index';

class Home extends Component {
  constructor(props) {
    super(props);
    this.state = {
      college: '',
      major: ''
    };
    const currentYear = new Date().getFullYear();
    this.yearList = [];
    this.yearList.push(currentYear);
    for (let i = 0; i <= 10; i++) {
      this.yearList.push(currentYear + i);
    }
  }
  componentDidMount() {
    this.props.getData();
  }
  componentWillReceiveProps(nextProps) {
    this.setState({ college: nextProps.data.college, major: nextProps.data.major });
  }
  onValueChange(value: string) {
    this.setState({
      selected: value
    });
  }
  navigateToRecommend() {
    this.props.navigation.navigate('Recommend');
  }
  handleChange(text, key) {
    this.setState({ [key]: text });
    this.props.updateUserPreference(this.state.college, this.state.major);
  }
  render() {
    return (
      <Container style={styles.container}>
           ...........render logic
      </Container>
    );
  }
}


function mapStateToProps(state, props) {
  return {
      data: state.dataReducer.data
  };
}

function mapDispatchToProps(dispatch) {
    return bindActionCreators(Actions, dispatch);
}

export default connect(mapStateToProps, mapDispatchToProps)(Home);

当我从Home移至推荐页面时，默认状态为空。此外，当调用更新首选项时，状态不会在主组件中发生变化。

编辑：

存储文件：

import { createStore, applyMiddleware } from 'redux';
import thunk from 'redux-thunk';

import reducers from './reducers/index'; //Import the reducer

export default createStore(reducers, applyMiddleware(thunk));