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javascript - 当状态改变时，使用来自 redux 的连接助手的 React Native 不会重新渲染？

问题描述

我用过reactJS并且我知道一个用助手包装的组件会在它的更改时connect监听特定的内容，它会导致组件。reducerreducer's statere-render

我不知道为什么相同的程序不起作用react-native，我测试了我action creators的以及reducers检查了百分百他们返回新state的，当我检查时componentWillRecieveProps我发现新状态被正确返回并且组件没有重新使成为。

减速器

const INITIAL = {
  isSigned: null
}

export default (state = INITIAL, action) => {
  switch(action.type){
    case SIGNED_IN : return {...state, isSigned: true};
    case LOGGED_OUT: return {...state, isSigned: false};
    default: return state;
  }
}

零件

import React, { Component } from 'react';
import { ActivityIndicator } from 'react-native';
import { connect } from 'react-redux';
import * as actions from '../../actions';


class Loading extends Component {
  constructor(props){
    super(props);

  }

  componentDidMount(){

    this.props.checkSigned();

     switch(this.props.isSigned){
       case null  : return;
       case false : this.props.navigation.navigate('Auth');
       case true  : this.props.navigation.navigate('App')
     }
  }

  render(){
    return (
        <ActivityIndicator size="large" color="black" />
    )
  }
}

const mapStateToProps = ({signed}) => {
  const {isSigned} = signed;
  return {
    isSigned
  }
}

export default connect(mapStateToProps, actions)(Loading);

行动

export const SIGNED_IN = 'SIGNED_IN';
export const LOGGED_OUT = 'LOGGED_OUT';

//Action Creators

export const checkSigned = () => async dispatch => {
    let token = await AsyncStorage.getItem('fb_token');
     if(token){
       dispatch({type: SIGNED_IN})
     }
    dispatch({type: LOGGED_OUT})
  }

标签： javascriptreact-nativeredux

解决方案

您需要使用bindActionCreators将您的操作作为道具发送

import { bindActionCreators } from 'redux';


const mapDispatchToProps = dispatch => bindActionCreators(actions, dispatch);
const mapStateToProps = state => {
  return {
    isSigned: state.isSigned
  }
}

export default connect(mapStateToProps, actions)(Loading);

// 在actions中，需要修复action code

export const checkSigned = () => async dispatch => {
let token = await AsyncStorage.getItem('fb_token');
 if(token){
   dispatch({type: SIGNED_IN});
 } else {
    dispatch({type: LOGGED_OUT});
 }
}

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