在react native中实现redux

Question

我正在尝试实现redux，以在多个屏幕中显示平衡，因为我在单个屏幕中更新平衡，它应该反映在所有其他屏幕/组件中。

我是redux的新手。正如你所知，由于redux的复杂性，它甚至很难实现

我遵循了GitHub和youtube中的一些例子并开始实现它。

在Actions文件夹下。以下两个文件

反制.js

import * as types from './actionTypes.js';
//ActionCreator methods
export function updateBalance(balanceInfo) {
return {
type: types.LEDGER_BALANCE,
payLoad: { balanceInfo }
}
}

在Reducers文件夹下。我有这个文件

balance.js

import * as types from '../actions/actionTypes.js';
const initialState = {
balance: 0
}
// reducer  functions .. accepts  current/initial state , actions and  returns new state

const balanceReducer=(state,action)=>
{
switch (action.type) {
case types.LEDGER_BALANCE:
return {
balance: action.payload.balanceInfo
}
break;
default:
break;
}
}
export default balanceReducer;

在ConfigureStore.js 中

import {createStore} from 'redux';
import rootReducer from './reducers/index.js';
import balanceReducer from './reducers/balance.js';
const initailState = {
balance: 0,
}
export const store=createStore(balanceReducer,balanceReducer);

App.js

/**
* Sample React Native App
* https://github.com/facebook/react-native
* @flow
*/
import React, { Component } from 'react';
import { Provider } from 'react-redux';
//Provider - makes redux store  available to connect() class in component hierarchy below
import { applyMiddleware, createStore, compose, combineReducers } from "redux";
import thunkMiddleware from 'redux-thunk';
import createLogger from 'redux-logger';
import rootReducer from './reducers/index.js';
//import store from './configureStore.js';
import {
Platform,
StyleSheet,
Text,
View,
TouchableOpacity,
TextInput
} from 'react-native';
import ReduxDemo from "./reduxDemo.js";
import { store, reducer } from './balanceDemo.js';
const instructions = Platform.select({
ios: 'Press Cmd+R to reload,n' +
'Cmd+D or shake for dev menu',
android: 'Double tap R on your keyboard to reload,n' +
'Shake or press menu button for dev menu',
});
export default class App extends Component<{}> {
constructor(props) {
super(props);
this.state = {
balancelocal: '',
}
}

_updateLedger = () => {
// store.dispatch({ type: 'BALANCE', payLoad: '500' });
store.dispatch({ type: 'BALANCE', payLoad: 'Your balance is 8000 MUR' });
}

render() {
store.subscribe(() => {
this.setState({
balancelocal: store.getState(),
})
//this.balanceInfo = store.getState().balance;
// alert(this.state.balancelocal);
});
return (
<View style={styles.container}>
<TouchableOpacity onPress={this._updateLedger}>
<Text>Update balance</Text>
</TouchableOpacity>
<TextInput style={{height:100,width:400}} value={this.state.balancelocal}/>
</View>
);
}
}

的造型

const styles = StyleSheet.create({
container: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: '#F5FCFF',
},
welcome: {
fontSize: 20,
textAlign: 'center',
margin: 10,
},
instructions: {
textAlign: 'center',
color: '#333333',
marginBottom: 5,
},
});

我还没有完成配置存储文件。和我想知道，我必须在哪里订阅和调度操作。。。

我想通过app.js中的按钮点击来更新余额我有。以自动更新另一页中的余额

请指导我理解并实现redux。请建议更好的文件夹结构和实现redux的更好方法。

Answer 1

https://redux.js.org/basics/exampletodolist
上面的链接有一个与redux反应的基本设置。React Native也差不多。

您需要将App组件封装在从"react redux"导入的Provider中，然后将其提供给AppRegistry。此外，您似乎没有导入任何操作，也没有使用连接功能。就像上面的评论一样，你最好看一看关于redux基础知识的视频指南。它将帮助你理解所有的复杂性，一旦你理解了，没有什么比redux更容易了。一切顺利。