React native ListView 增加顶部下拉刷新和底下点击刷

render() {
  if(!this.state.data){
   return(
     <Text>Loading... </Text>
   )
  }else{
   return(
     <ListView
      refreshControl={
       <RefreshControl 
         refreshing = {false}
         onRefresh = {this.reloadWordData.bind(this)}
       />
      }
      dataSource={this.state.data}
      renderRow={(rowData)=>this.renderRow(rowData)}
      renderFooter={this.renderFooter.bind(this)}
     >
      </ListView>
 
   );
  }
 }
 
renderFooter(){
   return (
   <View style={{marginVertical: 10, marginBottom:20}} >
      <Button
       onPress={this.addMoreOnFoot.bind(this)}
       title="点击载入更多"
      />
    </View>
   )
 }

addMoreOnFoot(){
 // alert('addMoreOnFoot')
 // console.log('addMoreOnFoot')
 const url = 'http://127.0.0.1/getFootContent?lastid=' + this.state.footLastId + '&count=20&isTop=0'
 fetch(url)
 .then((response)=>response.json())
 .then((jsondata)=>{
   if (jsondata.data && jsondata.data.length > 0){
   const rowData = this.state.jsondata.concat(jsondata.data);
   this.setState({
    footLastId:jsondata.data[jsondata.data.length - 1]['id'],
    jsondata:rowData,
    data:new ListView.DataSource({rowHasChanged:(r1, r2) => r1 != r2}).cloneWithRows(rowData),
   })
   }
 })
 .catch((error)=>{
  alert(error);
 });
}

render() {
  if(!this.state.data){
   return(
     <Text>Loading... </Text>
   )
  }else{
   return(
 
     <ListView
      refreshControl={
       <RefreshControl 
         refreshing = {false}
         onRefresh = {this.reloadWordData.bind(this)}
       />
      }
      dataSource={this.state.data}
      renderRow={(rowData)=>this.renderRow(rowData)}
      renderFooter={this.renderFooter.bind(this)}
     >
      </ListView>
 
   );
  }
 }

reloadWordData(){
  // alert(this.state.LastId)
  const url = 'http://127.0.0.1/getFootContent?lastid=' + this.state.LastId + '&count=20&isTop=1'
  fetch(url)
  .then((response)=>response.json())
  .then((jsondata)=>{
    if (jsondata.data && jsondata.data.length > 0){
    const rowData = jsondata.data.concat(this.state.jsondata);
    this.setState({
     LastId:jsondata.data[0]['id'],
     jsondata:rowData,
     data:new ListView.DataSource({rowHasChanged:(r1, r2) => r1 != r2}).cloneWithRows(rowData),
    })
    }
  })
  .catch((error)=>{
   alert(error);
  });
 }