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React Hooks如何主動更新Hooks組件

更新時間：2023年11月14日 17:08:54 作者：Franklin___

這篇文章主要介紹了React Hooks如何主動更新Hooks組件問題,具有很好的參考價值,希望對大家有所幫助,如有錯誤或未考慮完全的地方,望不吝賜教

React Hooks主動更新Hooks組件

當(dāng)我們用useState創(chuàng)建對象數(shù)組的時候，使用數(shù)組的index去改變數(shù)組某一項(xiàng)中的對象屬性時，useState無法監(jiān)聽到，此時視圖就無法更新，所以我們就需要主動強(qiáng)制更新視圖

const [friendCircleArr, setFriendCircleArr] = useState({
        name: 'Lucy',
        avator: P1,
        content: {
            text: '今天上課好累啊',
            image: null
        },
        time: '剛剛',
        isLike: false
    }, {
        name: 'Helena',
        avator: P2,
        content: {
            text: '杰倫太帥了吧??！',
            image: [Zhou1, Zhou2, Zhou3]
        },
        time: '1分鐘前',
        isLike: false
    })

此時我們?nèi)バ薷拇藢ο髷?shù)組

const likeClick = index => {
    const tempArr = friendCircleArr
    tempArr[index].isLike = !tempArr[index].isLike
    setFriendCircleArr(tempArr)
}

我們會發(fā)現(xiàn)視圖并沒有發(fā)生更新

此時我們就需要主動更新視圖

const [refresh, setRefresh] = useState(false)
useEffect(() => {
  refresh && setRefresh(false)
}, [refresh])
 
// 修改之前的代碼
const likeClick = index => {
    const tempArr = friendCircleArr
    tempArr[index].isLike = !tempArr[index].isLike
    setFriendCircleArr(tempArr)
    setRefresh(true)
}

創(chuàng)建一個refresh變量，用來控制視圖更新，此時再調(diào)用likeClick方法，視圖就可以正常更新了

react hooks更新、刷新子組件

import React, { Fragment, useEffect, useState, } from 'react';
import {
  Tabs,
  Button,
} from 'antd';
import { connect, history } from 'umi';
import Cmp1 from './components/cmp1';
import Cmp2 from './components/cmp2';
import Cmp3 from './components/cmp3';
import Cmp4 from './components/cmp4';
import Cmp5 from './components/cmp5';
import Cmp6 from './components/cmp6';

const { TabPane } = Tabs;

const DemoPage = () => {
  const [refresh, setRefresh] = useState(false);
  useEffect(() => {
    refresh && setTimeout(() => setRefresh(false));
  }, [refresh]);
  // tab切換
  const handleTabChange = (key) => {
    setCurrentKey(key);
  };
  //刷新，重新加載組件
  const handleReload = () => {
      setRefresh(true);
  };

  return (
    <Fragment>
      <div>
          <Button onClick={handleReload}>刷新</Button>
        <div>
          <Tabs activeKey={currentKey} onChange={handleTabChange}>
            <TabPane tab="1" key="1"></TabPane>
            <TabPane tab="2" key="2"></TabPane>
            <TabPane tab="3" key="3"></TabPane>
            <TabPane tab="4" key="4"></TabPane>
            <TabPane tab="5" key="5"></TabPane>
            <TabPane tab="6" key="6"></TabPane>
          </Tabs>
          {currentKey === '1' && !refresh && (
              <Cmp1/>
          )}
          {currentKey === '2' && !refresh && (
              <Cmp2/>
          )}
          {currentKey === '3' && !refresh && (
             <Cmp3/>
          )}
          {currentKey === '4' && !refresh && (
              <Cmp4/>
          )}
          {currentKey === '5' && !refresh && (
              <Cmp5/>
          )}
          {currentKey === '6' && !refresh && (
              <Cmp6/>
          )}
        </div>
      </div>
    </Fragment>
  );
};
export default connect()(DemoPage);