RN gridView实践

主要的属性是ListView 的 contentContainerStyle属性
用来设置ListView的样式

/**
 *  GridView 
 */

import React, { Component } from 'react';
import {
    Platform,
    StyleSheet,
    Text,
    View,
    Image,
    ListView,
    TouchableOpacity
} from 'react-native';

var Dimensions=require('Dimensions')

var width=Dimensions.get('window').width;

var rows=3;//有几列

var itemWidth=100;//每隔item的宽度

var mMarginRight=(width-itemWidth*rows)/(rows+1);//计算每个item的右边距

var mMarginBottom=10


var datas=require('./1.json');

export default class GridViewDemo extends Component<{}> {


    constructor(props) {
        super(props)
        //1.设置数据源  固定写法
        var ds=new ListView.DataSource({rowHasChanged:(r1,r2)=>r1!==r2})
        //2.设置返回的数据  固定写法
        this.state={
            dataSource:ds.cloneWithRows(datas)
        }
    }


    render() {
        return (
            <View style={styles.container}>
                  <ListView
                      contentContainerStyle={styles.listViewStyle}
                    dataSource={this.state.dataSource}
                    renderRow={this.renderRow}>
                </ListView>
            </View>
        );
    }

    //设置每行的item
    renderRow(rowData,sectionID,rowID,highlightRow){
        return(
            <TouchableOpacity activeOpacity={0.6}>
                <View style={styles.ViewStyle}>
                    <Image source={{uri:rowData.instrument}} style={styles.imageStyle}/>
                    <Text style={styles.bottomStyle}>
                        {rowData.firstName}
                    </Text>
                </View>
            </TouchableOpacity>
        )
    }

}





const styles=StyleSheet.create({
    container:{
        flex:1, //设置全为1说明它占一份,
        backgroundColor:'white',
        paddingTop:5
    },
    imageStyle:{
        width:80,
        height:80
    },
    listViewStyle:{
        flexDirection:'row',
        flexWrap:'wrap'
    },
    ViewStyle:{
        width:itemWidth,
        height:itemWidth,
        marginLeft:mMarginRight,
        marginBottom:mMarginBottom,
        alignItems:'center'
    },
    bottomStyle:{
        marginTop:3
    }

})