javascript - reducer 不更新 react redux 中的状态

Question

我正在尝试使用 react-redux 更新状态，但状态未更新。新的值(value)正在到来“如果(action.type ==='SET_LOGGED_IN')”在 reducer 中，但不将 isLoggedIn 更新为 true。什么问题？ find the code

登录.js

function handleLoginClick(username, password, e) {
    e.preventDefault();

    post('/createUser', { username, password })
        .then(({ status }) => {
            if (status === 200) {
                console.log(this.props);
                this.props.setLoggedIn(true);
                this.props.history.push('/');
            }else{
                this.props.setLoggedIn(false);

            }
        })
        .catch(error => {
        .........
        })
}
..................
const mapStateToProps = state => {
    return {isLoggedIn : state.reducer.isLoggedIn};};
const mapDispatchToProps = dispatch => {
    return {setLoggedIn : (value) => dispatch({type: 'SET_LOGGED_IN', value: value}),}};

export default compose(
    withStyles(styles),
    withRouter,
    connect(mapStateToProps, mapDispatchToProps)
)(NewLogin);

reducer.js

import { combineReducers } from 'redux';
import { reducer as reduxFormReducer } from 'redux-form';

const initialStates = {
    isLoggedIn : false
};

const reducers = combineReducers({
    reducer : (state = initialStates, action) => {
        //console.log(action);
        if (action.type === 'SET_LOGGED_IN') {
            //console.log(action);
            return {
                ...state,
                isLoggedIn: action.value
            };
        }
        return state;
    },

        form: reduxFormReducer, // mounted under "form"
});

export default reducers;

Answer 1

-修正错误-

在我的代码中，状态更新正确。当我访问时，我使用了未定义的 state.isLoggedIn。我从 state.reducer.isLoggedIn 替换了它。现在一切正常。

感谢@UmairFarooq、@VladimirBogomolov 以及所有发表评论并尝试修复它的人。

const mapStateToProps = state => {
    return {
      isLoggedIn : state.reducer.isLoggedIn
    };
};