Redux的使用

Redux 分为store，reducers，action，话不多说直接贴代码。
首先是reducers中定义一些type键，用于reducers处理状态

const LOGIN = 'LOGIN';
const LOGIN_SUCCESS = 'LOGIN_SUCCESS';
const LOGIN_FAIL = 'LOGIN_FAIL';

然后就是reducers的纯函数

const initialState = {
    isLoginIn: false,
    userInfo: {},
    msg: ''
};
export default function loginReducer (state = initialState, action) {
    switch (action.type) {
        case LOGIN:
            return {
                ...state,
                isLoginIn: false,
                userInfo: {}
            };
        case LOGIN_SUCCESS:
            console.log('LOGIN_SUCCESS');
            console.log(action);
            return {
                ...state,
                isLoginIn: true,
                userInfo: action.userInfo
            };
        case LOGIN_FAIL:
            console.log('LOGIN_FAIL');
            console.log(action);
            return {
                ...state,
                isLoginIn: false,
            };
        default:
            return state;
    }
};

initialState 是初始状态，是你需要用到的一些数据或者状态，type里面是状态更新...state 复制一份state，一般不在原state上做更改。

/**
    * action: login
*/
export function performLoginAction(username, password) {
    return (dispatch) => { 
        dispatch({'type': LOGIN})
        Util.post(API.LOGIN,{'phone':username,'password':password},function(ret){
            console.log(ret);
            if (ret.code == 200) {
                dispatch({'type': LOGIN_SUCCESS, userInfo: ret.data, msg: ret.msg,isLoginIn: true})
            }else {
                dispatch({'type': LOGIN_FAIL, msg: ret.msg, isLoginIn: false})
            }
        }) 
        
    }  
}

这里就是一个action，就是一个网络请求，对请求结果进行处理，成功或者失败都使用dispatch分发处理type，给state赋值。这里就是一个reducer的内容，其实是把action和reducer合在一起进行处理。

接下来就是store 完全的复制粘贴就可以了

'use strict';
import {createStore, applyMiddleware} from 'redux';  
import thunkMiddleware from 'redux-thunk';  
import rootReducer from './Reducers/reducers';  
  
const createStoreWithMiddleware = applyMiddleware(thunkMiddleware)(createStore);  
  
export default function configureStore(initialState) {  
    const store = createStoreWithMiddleware(rootReducer, initialState);  
    return store;  
}  

需要注意的是rootReducer是所有的reducer的合集，下面只是一个reducer,创建多个reducer也是在这块写。

import {combineReducers} from 'redux';  
import LoginReducer from './login';   
  
const rootReducer = combineReducers({  
    login: LoginReducer,  
});  
  
export default rootReducer; 

store写完之后，就要去程序根js中嵌套，

import React from 'react';
import { StyleSheet, Text, View } from 'react-native';
import {Provider} from 'react-redux'  
import Root from './src/Component'
import configureStore from './src/Redux/creat'

const store = configureStore();  

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

打工是不可能的.gif