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React-Native左右联动List的示例代码

Posted in Javascript onSeptember 21, 2017

一：左右联动List,在工作中很常见。

今天分享一个同事写的例子，本人只做了简单修改。

注意：本例子必须修改源码，参考本文第三条。

二：Coding

ParcelPage.js:

import React, { Component } from 'react';
import {
  AppRegistry,
  StyleSheet,
  Text,
  View,
  FlatList,
  SectionList,
  Dimensions,
  TouchableOpacity,
  Image,
} from 'react-native';

import ParcelData from './ParcelData.json'

var { width, height } = Dimensions.get('window');

let Headers = [];


export default class ParcelPage extends Component {

  static navigationOptions = ({ navigation }) => ({
    headerTitle : '联动List',
  });

  componentDidMount() {
    ParcelData.map((item, i) => {
      Headers.push(item.section);
    });
  };

  componentWillUnmount() {
    Headers = [];
  };

  renderLRow = (item) => {
    return (
      <TouchableOpacity style={[ styles.lItem, {backgroundColor: item.index == this.state.cell ? 'white' : null} ]}
               onPress={()=>this.cellAction(item)}>
        <Text style={styles.lText}>{ item.item.section }</Text>
      </TouchableOpacity>
    )
  };

  cellAction = (item) => {
    if (item.index <= ParcelData.length) {
      this.setState({
        cell : item.index
      });
      if (item.index > 0) {
        var count = 0;
        for (var i = 0;
          i < item.index;
          i++) {
          count += ParcelData[ i ].data.length + 1
        }
        this.refs.sectionList.scrollToIndex({ animated : false, index : count })
      } else {
        this.refs.sectionList.scrollToIndex({ animated : false, index : 0 });
      }

    }

  };

  itemChange = (info) => {
    let section = info.viewableItems[ 0 ].section.section;
    if (section) {
      let index = Headers.indexOf(section);
      if (index < 0) {
        index = 0;
      }
      this.setState({ cell : index });
    }
  };

  state = {
    cell : 0
  };

  renderRRow = (item) => {
    return (
      <View style={ styles.rItem }>
        <Image style={ styles.icon } source={{ uri : item.item.img }}/>
        <View style={ styles.rItemDetail }>
          <Text style={ styles.foodName }>{ item.item.name }</Text>
          <View style={ styles.saleFavorite }>
            <Text style={ styles.saleFavoriteText }>{ item.item.sale }</Text>
            <Text style={ [styles.saleFavoriteText,{ marginLeft:15 }]}>{ item.item.favorite }</Text>
          </View>
          <Text style={ styles.moneyText }>￥{ item.item.money }</Text>
        </View>
      </View>
    )
  };

  sectionComp = (section) => {
    return (
      <View style={{height:30,backgroundColor:'#DEDEDE',justifyContent:'center',alignItems:'center'}}>
        <Text >{section.section.section}</Text>
      </View>
    )
  };

  separator = () => {
    return (
      <View style={{height:1,backgroundColor:'gray'}}/>
    )
  };

  render() {
    return (
      <View style={ styles.container }>
        <FlatList
          ref='FlatList'
          style={ styles.leftList }
          data={ ParcelData }
          renderItem={(item) => this.renderLRow(item)}
          ItemSeparatorComponent={ () => this.separator() }
          keyExtractor={ (item) => item.section }
        />
        <SectionList
          ref='sectionList'
          style={ styles.rightList }
          renderSectionHeader={ (section) => this.sectionComp(section) }
          renderItem={ (item) => this.renderRRow(item) }
          sections={ ParcelData }
          keyExtractor={ (item) => item.name }
          onViewableItemsChanged={ (info) => this.itemChange(info) }
        />
      </View>
    );
  }
}

const styles = StyleSheet.create({
  container : {
    flexDirection : 'row'
  },
  leftList : {
    width : 1 * width / 4,
    backgroundColor : '#E9E9EF'
  },
  lItem : {
    minHeight : 44,
    justifyContent : 'center',
  },
  lText : {
    marginLeft : 10,
    marginRight : 10,
    fontSize : 16,
  },
  rightList : {
    width : 3 * width / 4
  },
  rItem : {
    flexDirection : 'row'
  },
  rItemDetail : {
    flex : 1,
    marginTop : 10,
    marginLeft : 5
  },
  icon : {
    height : 60,
    width : 60,
    marginTop : 10,
    marginBottom : 10,
    marginLeft : 8,
    borderWidth : 1,
    borderColor : '#999999'
  },
  foodName : {
    fontSize : 18,
  },
  saleFavorite : {
    flexDirection : 'row',
    marginTop : 5,
    marginBottom : 5,
  },
  saleFavoriteText : {
    fontSize : 13,
  },
  moneyText : {
    color : 'orange'
  },
});

ParcelData.js

[
 {
  "section" : "热销",
  "data" : [
   {
    "name" : "蟹黄汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "20",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "小馄饨",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "蟹黄汤包+牛杂粉丝汤套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "35",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "鸭血粉丝汤",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "15",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "介绍我们",
  "data" : [
   {
    "name" : "慎用差评！任何问题联系我们就可解决哦",
    "sale" : "月售1",
    "favorite" : "赞0",
    "money" : "0",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   }
  ]
 },
 {
  "section" : "折扣套餐",
  "data" : [
   {
    "name" : "特色蟹黄汤包+鸭血粉丝汤+果汁套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "50",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "蟹黄汤包+牛杂粉丝汤套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "35",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "蟹黄汤包+南瓜粥+果汁套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "金牌蟹黄汤包+紫米粥+柠檬果汁套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "台式卤肉饭+南瓜粥套餐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "纯手工汤宝",
  "data" : [
   {
    "name" : "金牌蟹黄汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "蟹庭丰特色蟹黄汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "蟹黄汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "干贝汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "鲍鱼汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "全家福汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "虾仁汤包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "汤、粥类",
  "data" : [
   {
    "name" : "紫米粥",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "金丝南瓜粥",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "小米粥",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "白粥",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "面食类",
  "data" : [
   {
    "name" : "鸡汤面",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "红烧小排面",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "红烧牛肉面",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "调味小菜",
  "data" : [
   {
    "name" : "肉松",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "辣椒包",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "泡菜",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "酱黄瓜",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "萝卜干",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 },
 {
  "section" : "饮料",
  "data" : [
   {
    "name" : "可乐",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/__39230311__3449301.jpg"
   },
   {
    "name" : "雪碧",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p1.meituan.net/deal/849d8b59a2d9cc5864d65784dfd6fdc6105232.jpg"
   },
   {
    "name" : "王老吉",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   },
   {
    "name" : "橙汁",
    "sale" : "月售875",
    "favorite" : "赞31",
    "money" : "10",
    "img":"http://p0.meituan.net/deal/ed3025663342b126eaae24764704b017136487.jpg"
   }
  ]
 }
]

三：修改源码

1-:SectionList

node_modules/react-native/Libraries/Lists/SectionList.js,代码格式化后大概在187行的位置，修改如下

 class SectionList<SectionT: SectionBase<any>>
  extends React.PureComponent<DefaultProps, Props<SectionT>, void> {
  props: Props<SectionT>;
  static defaultProps: DefaultProps = defaultProps;

  render() {
    const List = this.props.legacyImplementation ? MetroListView : VirtualizedSectionList;
    return <List
      ref={this._captureRef}
      {...this.props} />;
  }

  _captureRef = (ref) => {
    this._listRef = ref;
  };

  scrollToIndex = (params: { animated?: ?boolean, index: number, viewPosition?: number }) => {
    this._listRef.scrollToIndex(params);
  }
}

2-:VirtualizedSectionList

路径在node_modules/react-native/Libraries/Lists/VirtualizedSectionList.js，大概253行处修改如下：

render() {
    return <VirtualizedList
      ref={this._captureRef}
      {...this.state.childProps} />;
  }

  _captureRef = (ref) => {
    this._listRef = ref;
  };

  scrollToIndex = (params: { animated?: ?boolean, index: number, viewPosition?: number }) => {
    this._listRef.scrollToIndex(params);
  }

四：

1-：代码github地址：https://github.com/erhutime/React-Navigation-All

2-：下载完成后，修改index.ios.js:入口文件如下：

import App from './jscode/doubleList/App'
AppRegistry.registerComponent('All', () => App);

五：效果图如下：

React-Native左右联动List的示例代码

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持三水点靠木。

React-Native左右联动List的示例代码

- Author -

Time_情书

声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。

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