react-native-scrolltotop

import ScrollTopView from 'react-native-scrolltotop';  //first set default state in your constructor  constructor(props) {    //...    this.state = {      isShowToTop: false,    };  }  //then bind a method to detect the scroll distance of your listView  //set ref with 'listview'  
    
     this._onScroll(e)}         style={
  styles.listView}         renderScrollComponent={(props)=>{            return 
             }}/>  //here is the _onScrol method  _onScroll(e) {    var offsetY = e.nativeEvent.contentOffset.y;    if(offsetY > 100) {        this.setState({            isShowToTop: true        })    } else {        this.setState({            isShowToTop: false        })    }  }//use it with your listView together  
         
            
       
        消息列表
           
          {listView}    {
  this.state.isShowToTop?
      :null}