Taro下拉刷新，上拉加载更多

效果图：


1、引入插件

import Taro, { Component } from '@tarojs/taro'
import { View, Text, ScrollView } from '@tarojs/components'
import { AtActivityIndicator } from 'taro-ui'
import './index.scss'

2、render (){}

render () {
		let dargStyle = this.state.dargStyle;
        let downDragStyle = this.state.downDragStyle;
        let upDragStyle = this.state.upDragStyle;
        return (
			
			aaaaaaaa
            
                
                    
                    {this.state.downText}
                
                
                    aaaaaaaa
                
                
                    
                    {this.state.pullText}
                
            
			
        )
    }

3、方法

constructor(props) {
        super(props)
        this.state = {
            dargStyle: {//下拉框的样式
                top: 0 + 'px'
            },
            downDragStyle: {//下拉图标的样式
                height: 0 + 'px'
            },
            downText: '下拉刷新',
            upDragStyle: {//上拉图标样式
                height: 0 + 'px'
            },
            pullText: '上拉加载更多',
            start_p: {},
            scrollY:true,
            dargState: 0//刷新状态 0不做操作 1刷新 -1加载更多
        }
    }
    reduction() {//还原初始设置
        const time = 0.5;
        this.setState({
            upDragStyle: {//上拉图标样式
                height: 0 + 'px',
                transition: `all ${time}s`
            },
            dargState: 0,
            dargStyle: {
                top: 0 + 'px',
                transition: `all ${time}s`
            },
            downDragStyle: {
                height: 0 + 'px',
                transition: `all ${time}s`
            },
            scrollY:true
        })
        setTimeout(() => {
            this.setState({
                dargStyle: {
                    top: 0 + 'px',
                },
                upDragStyle: {//上拉图标样式
                    height: 0 + 'px'
                },
                pullText: '上拉加载更多',
                downText: '下拉刷新'
            })
        }, time * 1000);
    }
    touchStart(e) {
        this.setState({
            start_p: e.touches[0]
        })
    }
    touchmove(e) {
		let that = this
        let move_p = e.touches[0],//移动时的位置
            deviationX = 0.30,//左右偏移量(超过这个偏移量不执行下拉操作)
            deviationY = 70,//拉动长度（低于这个值的时候不执行）
            maxY = 100;//拉动的最大高度

        let start_x = this.state.start_p.clientX,
            start_y = this.state.start_p.clientY,
            move_x = move_p.clientX,
            move_y = move_p.clientY;


        //得到偏移数值
        let dev = Math.abs(move_x - start_x) / Math.abs(move_y - start_y);
        if (dev < deviationX) {//当偏移数值大于设置的偏移数值时则不执行操作
            let pY = Math.abs(move_y - start_y) / 3.5;//拖动倍率（使拖动的时候有粘滞的感觉--试了很多次 这个倍率刚好）
			if (move_y - start_y > 0) {//下拉操作
				if (pY >= deviationY) {
					this.setState({ dargState: 1, downText: '释放刷新' })
				} else {
					this.setState({ dargState: 0, downText: '下拉刷新' })
				}
				if (pY >= maxY) {
					pY = maxY
				}
				this.setState({
					dargStyle: {
						top: pY + 'px',
					},
					downDragStyle: {
						height: pY + 'px'
					},
					scrollY:false//拖动的时候禁用
				})
			}
			if (start_y - move_y > 0) {//上拉操作
				console.log('上拉操作')
				if (pY >= deviationY) {
					this.setState({ dargState: -1, pullText: '释放加载更多' })
				} else {
					this.setState({ dargState: 0, pullText: '上拉加载更多' })
				}
				if (pY >= maxY) {
					pY = maxY
				}
				this.setState({
					dargStyle: {
						top: -pY + 'px',
					},
					upDragStyle: {
						height: pY + 'px'
					},
					scrollY: false//拖动的时候禁用
				})
			}

        }
    }
    pull() {//上拉
		console.log('上拉')
        // this.props.onPull()
    }
    down() {//下拉
	console.log('下拉')
        // this.props.onDown()
    }
    ScrollToUpper() { //滚动到顶部事件
	console.log('滚动到顶部事件')
        // this.props.Upper()
    }
    ScrollToLower() { //滚动到底部事件
	console.log('滚动到底部事件')
        // this.props.Lower()
    }
    touchEnd(e) {
        if (this.state.dargState === 1) {
            this.down()
        } else if (this.state.dargState === -1) {
            this.pull()
        }
        this.reduction()
    }

4、scss

.dragUpdataPage{height: 50vh;position: relative;overflow: hidden;
	.downDragBox{
	    width: 100%;
	    top: 0px;
	    display: flex;
	    overflow: hidden;
	    justify-content: center;
	    align-items: center;
	    font-size: 30px;
	    position: absolute;
	}
	.upDragBox{
	    bottom: 0px;
	    width: 100%;
	    display: flex;
	    overflow: hidden;
	    justify-content: center;
	    align-items: center;
	    font-size: 30px;
	    position: absolute;
	}
	.dragUpdata{height: 100%;width: 100%;position: absolute;}
	.downText{margin-left: 20px;}
}

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