人只需不取得标的目标，就不会取得自己。有没有人爱，我们也要努力做一个可爱的人。不埋怨谁，不嘲笑谁，也不羡慕谁，阳光下灿烂，风雨中奔跑，做自己的梦，走自己的路。
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：
以上就是React-Native左右联动List的示例代码。是一趟旅途，每个人都在途中，路过的都是景，擦肩的都是客，遇到的都是缘，回忆的都是念，时光如淡烟，我们抓不住，美好一瞬间，不能长久拥有，学会从过去中转身，幸福才会招待你。更多关于React-Native左右联动List的示例代码请关注haodaima.com其它相关文章！