ReactNative随手势滑动的进度条

一、效果图

二、 这里没什么分析的，主要是处理手势事件，然后把手指滑动的x座标传递上面的滑动文本即可，权当一个demo使用
直接放上源码：

import React from 'react';
import {View, Dimensions, StyleSheet, PanResponder, Text,ProgressViewIOS,ProgressBarAndroid,Platform} from "react-native";

var totalWidth = Dimensions.get('window').width;
export default class MoveProgressBar extends React.Component {


    constructor(props){
        super(props)
        this.watcher = null;
        this.state = {
            progress:0,
            left:10
        };
        this._onPanResponderGrant = this._onPanResponderGrant.bind(this);
        this._onPanResponderMove = this._onPanResponderMove.bind(this);
    };

    componentWillMount(){
        this.watcher  = PanResponder.create({
            onStartShouldSetPanResponder:()=>{
                return true;
            },

            onPanResponderGrant:this._onPanResponderGrant,

            onPanResponderMove:this._onPanResponderMove,
        });
    };

    _onPanResponderGrant(e,gestureState){

        let touchPointX = gestureState.x0;
        let progress;
        if(touchPointX < 20){
            progress = 0;
        } else{
            if(touchPointX > (totalWidth - 40)){
                progress = 1;
            }else {
                progress = (touchPointX - 20) / (totalWidth - 40);
            }
        }
    };

    _onPanResponderMove(e,gestureState){
        let touchPointX = gestureState.moveX;
        let progress;
        if(touchPointX < 20){
            progress = 0;
        } else{
            if(touchPointX > (totalWidth - 40)){
                progress = 1;
            }else {
                progress = (touchPointX - 20) / (totalWidth - 40);
            }
        }

        this.setState({
            progress:progress,
            left:touchPointX,
        });
    };


    render() {
        return (
            
                

                
                    当前进度{Math.round(this.state.progress * 100)} %
                

                
                    {Math.round(this.state.progress * 100)} %
                

                
                

            
        )
    }
}

const styles = StyleSheet.create({

    ProgressViewStyle:{
        width: totalWidth - 40,
        height:40,
        left:20,
        top:100,
    },

    container:{
        flex:1,
    },

    touchViewStyle:{
        width:totalWidth - 20,
        height:40,
        backgroundColor:'#bc8907',
        position:'absolute',
        left:10,
        top:262,

    },

    textStyle:{
        fontSize: 30,
        left:20,
        top:120,
    },

    indexTextStyle:{
        width:30,
        fontSize:12,
        color:'#770099',
        top:150,
        backgroundColor:'#11cc55'
    },



    pan1: {
        ...StyleSheet.absoluteFillObject,
        backgroundColor: 'red',
        justifyContent: 'center'
    },
    pan2: {
        height: 200,
        justifyContent: 'center',
        backgroundColor: 'yellow'
    },
    pan3: {
        height: 100,
        backgroundColor: 'blue'
    }
})