RN实现iOS tableview分组吸顶效果

/**
 * Sample React Native App
 * https://github.com/facebook/react-native
 * @flow
 */

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

var Car = require('./Car.json');

var ListDemo3 = React.createClass({
  getInitialState(){
    return{
      ds: new ListView.DataSource({
        getSectionData: (dataBlob, sectionID) => dataBlob[sectionID],
        getRowData: (dataBlob, sectionID, rowID) => dataBlob[sectionID + ':' + rowID],
        rowHasChanged: (r1, r2) => r1 !== r2,
        sectionHeaderHasChanged:(s1, s2) => s1 !== s2
      })
    }
  },
  componentDidMount(){
    var jsonData = Car.data;
    var dataBlob = {}, sectionIDs = [], rowIDs = [], cars = [];
    for(var i=0; i<jsonData.length; i++){
      sectionIDs.push(i);
      dataBlob[i] = jsonData[i].title;
      cars = jsonData[i].cars;
      rowIDs[i] = [];
      for(var j=0; j<cars.length; j++){
        rowIDs[i].push(j);
        dataBlob[i+':'+j] = cars[j];
      }
    }
    this.setState({
      ds: this.state.ds.cloneWithRowsAndSections(dataBlob,sectionIDs,rowIDs)
    });
  },
  render() {
    return (
        <View style={styles.outerViewStyle}>
          <View style={styles.headerViewStyle}>
            <Text style={{color:'white', fontSize:20}}>tableview吸顶效果Demo</Text>
          </View>
          <ListView
              dataSource={this.state.ds}
              renderRow={this.renderRow}
              renderSectionHeader={this.renderSectionHeader}
          />
        </View>
    );
  },
  renderRow(row){
    return(
        <TouchableOpacity activeOpacity={0.5}>
          <View style={styles.rowStyle}>
            <Image source={{uri: row.icon}} style={styles.rowImageStyle}/>
            <Text style={{marginLeft:8}}>{row.name}</Text>
          </View>
        </TouchableOpacity>
    );
  },
  renderSectionHeader(sectionData, sectionID){
    return(
        <View style={styles.sectionHeaderViewStyle}>
          <Text style={{marginLeft:8, color:'white'}}>{sectionData}</Text>
        </View>
    );
  }
});

const styles = StyleSheet.create({
  outerViewStyle:{
    flex:1
  },
  headerViewStyle:{
    height:44,
    backgroundColor:'orange',
    justifyContent:'flex-end',
    alignItems:'center'
  },
  rowStyle:{
    flexDirection:'row',
    alignItems:'center',
    padding:8,
    borderBottomColor:'#EEEEEE',
    borderBottomWidth:0.5
  },
  rowImageStyle:{
    width:60,
    height:60,
  },
  sectionHeaderViewStyle:{
    backgroundColor:'#BBBBBB',
    height:20,
    justifyContent:'center'
  }
});

AppRegistry.registerComponent('ListDemo3', () => ListDemo3);
/**
 * Sample React Native App
 * https://githu