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Taro UI框架开发小程序实现左滑喜欢右滑不喜欢效果的示例代码

Taro 就是可以用 React 语法写小程序的框架,拥有多端转换能力,一套代码可编译为微信小程序、百度小程序、支付宝小程序、H5、RN等

摘要:

年后入职了一家新公司,与前同事交接完之后,发现公司有一个四端的项目(iOS,Android,H5,小程序),iOS和安卓都实现了左滑右滑的效果,而h5和小程序端没实现,询问得知前同事因网上没找到对应的插件,相关博客也特别少,所以没做就搁置下来了。

趁这段时间相对来说比较富裕,于是乎在网上也搜索了一下,发现确实很少,但是有人提到可以用小程序可拖动组件movable-view来实现,自己尝试来一下发现可行,于是来写这篇博客记录一下,希望能帮助到后面需要用到这个功能的人!

先上效果图:

Taro UI框架开发小程序实现左滑喜欢右滑不喜欢效果的示例代码

主要技术:Taro+Taro UI+React(如果你是小程序原生或者uniapp+vue写法都差不多,可以通用)

可拖动组件文档地址:

Taro:https://taro-docs.jd.com/taro/docs/components/viewContainer/movable-view.html

微信小程序:https://developers.weixin.qq.com/miniprogram/dev/component/movable-view.html

思路:

一,我们首先把movable-area和movable-view标签写出来;

<movable-area>
 <movable-view>
 ......
 </movable-view>
</movable-area>

二,我们可以看到文档里面有一个onChange方法,即拖动过程中触发的事件;

<movable-area>
 <movable-view onChange ={this. onChange.bind(this)}>
 ......
 </movable-view>
</movable-area>

// 触发方法,打印参数
onChange(e) {
 console.log('参数',e);
}

我们可以看到打印出了,拖动的位置和产生移动的原因等;

三,我们接着加入开始onTouchstart,移动onTouchmove,结束onTouchcancel,onTouchend三个事件方法;

<MovableView 
 key={item.id} 
 onTouchcancel={this.onCancel} 
 onTouchend={this.onCancel} 
 onTouchstart={this.onTouchStart} 
 onTouchmove={this.onTouchMove} 
 x={this.state.x} // 横坐标位置
 y={this.state.y} // 纵坐标位置
 direction='all' // 移动方向都可以
 outOfBounds // 可超过可移动区域
 className='shop-imgbox' 
> 
<--中间加入图片之类的滑动内容-->
</MovableView>

初始数据如下:

state = { 
 x: '16', 
 y: '16', 
 like: false, 
 unlike: false, 
 shopList: [ 
 { 
 img: 'https://edgefix-image.edgecom.top/ABD846F6672997A7F76CD38E8A57F954.jpg', 
 }, 
 { 
 img: 'https://edgefix-image.edgecom.top/F6E5801C304CC76DA63C02C9FB38B8F4.jpg', 
 }, 
 { 
 img: 'https://edgefix-image.edgecom.top/D518952AD1DD61B2D32556E20CC527C4.jpg', 
 }, 
 { 
 img: 'https://edgefix-image.edgecom.top/1D187E28B349679908A44BBE81F3D3CA.jpg', 
 }, 
 { 
 img: 'https://edgefix-image.edgecom.top/1129A411AC9CF5F81187CBED181B6F57.jpg', 
 } 
 ] 
 }

三个方法我们可以取到移动后改变的位置,来改变喜欢与不喜欢的状态css,以及实现卡片滑动的效果:

1.触摸触发的时候,我们获取到刚刚开始触摸卡片的x,y的位置坐标;

2.在触摸滑动时,我们通过滑动后的位置-滑动前的位置,来判断距离多少来改变喜欢和不喜欢的值;

3.当手离开时,触发取消事件,我们需要把状态数据改为原始值,即回到最初的状态;

// 触摸触发 
 onTouchStart(e) { 
 console.log('222',e.touches[0].pageX); 
 this.setState({ 
 x: e.touches[0].pageX, 
 y: e.touches[0].pageY, 
 }); 
 } 
 // 触摸移动 
 onTouchMove(e) { 
 console.log('333',e.touches[0].pageX); 
 let dx = e.touches[0].pageX - this.state.x; 
 if (dx > 50) { 
 this.setState({ 
 like: true, 
 unlike: false, 
 }); 
 } else if (dx < -50) { 
 this.setState({ 
 like: false, 
 unlike: true, 
 }); 
 } else { 
 this.setState({ 
 like: false, 
 unlike: false, 
 }); 
 } 
 } 
 // 取消 
 onCancel(e) { 
 console.log('444',e.changedTouches[0].pageX); 
 this.setState({ 
 x: '16', 
 y: '16', 
 like: false, 
 unlike: false, 
 }); 
 }

当我们写到这里,我们去拖动我们的卡片时,你会发现确实可以拖动,并且取消的时候会回到原点,但是同样你也会发现一个问题,就是你拖动的时候,五张卡片都被触发来移动的效果,出现了触点混乱的问题,查找问题发现卡片共用了x,y,因此我们可以给每张卡片设置独立的参数;

四,给每张卡片独立的参数并且设置卡片倾斜度效果;

1.设置倾斜度效果

style={{transform:'rotate('+this.state.tiltAngle[index]+'deg)'}}

然后我们通过卡片移动位置计算出一个你决定合适的倾斜角度;

// 拖动后相差距离进行换算角度
let dxangle = (e.touches[0].pageX - this.state.startX) * 45 / 500;

2.设置独立的参数

方法携带索引,我们取到对应的卡片index,来改变对应卡片的数据;

<MovableView 
 key={item.id}
 onTouchcancel={this.onCancel.bind(this,index)}
 onTouchend={this.onCancel.bind(this,index)}
 onTouchstart={this.onTouchStart.bind(this,index)}
 onTouchmove={this.onTouchMove.bind(this,index)}
 x={this.state.x[index]} 
 y={this.state.y[index]} 
 direction='all' 
 outOfBounds 
 className='shop-imgbox'
>
</MovableView>

同时,我们需要改变初始参数的形式为数组,我们通过索引改变对应卡片的值;

state = {
 // 开始位置
 startX: '',
 // 开始位置-最终位置距离
 placeX: '',
 // 倾斜角度
 tiltAngle: ['0','0','0','0','0'],
 // 坐标
 x: ['16','16','16','16','16'],
 y: ['16','16','16','16','16'],
 // 是否喜欢状态
 like: [false,false,false,false,false],
 unlike: [false,false,false,false,false],
 // 推荐商品数组
 shopList: [
 {
 id: 1,
 img: 'https://edgefix-image.edgecom.top/ABD846F6672997A7F76CD38E8A57F954.jpg',
 },
 {
 id: 2,
 img: 'https://edgefix-image.edgecom.top/F6E5801C304CC76DA63C02C9FB38B8F4.jpg',
 },
 {
 id: 3,
 img: 'https://edgefix-image.edgecom.top/D518952AD1DD61B2D32556E20CC527C4.jpg',
 },
 {
 id: 4,
 img: 'https://edgefix-image.edgecom.top/1D187E28B349679908A44BBE81F3D3CA.jpg',
 },
 {
 id: 5,
 img: 'https://edgefix-image.edgecom.top/1129A411AC9CF5F81187CBED181B6F57.jpg',
 }
 ]
 }

方法我们就举一个例子,比如onTouchStart方法,我们遍历卡片数组,通过判断索引来得到是那张卡片,从而来改变对应值

// 触摸触发
 onTouchStart(index,e) {
 console.log('1111',index,e.touches[0].pageX,e.touches[0].pageY);
 // 重定义数组
 var againX = [];
 var againY = [];
 // 遍历,判断拖动的该数组的位置
 for (var i=0; i<this.state.shopList.length; i++){
 if (i == index) {
 againX[i] = e.touches[0].pageX;
 againY[i] = e.touches[0].pageY;
 } else {
 againX[i] = '16';
 againY[i] = '16';
 }
 }
 // 赋值
 this.setState({
 startX: e.touches[0].pageX,
 x: againX,
 y: againY,
 });
 }

这样,我们运行代码,发现拖动第一张卡片不会影响到后面卡片的位置了,

同时,我们现在拖动卡片删除的是数组,在实际项目中,我们在触发删除数组的地方接入接口,调用喜欢,不喜欢改变数据参数,从而也能改变数组的长度;

五,完整代码;

下面我将贴出完整的代码供大家参考

html文件:

import Taro, { Component } from '@tarojs/taro';
import { View, Image, Button, Text, MovableArea, MovableView } from '@tarojs/components';
import { observer, inject } from '@tarojs/mobx';
import { AtButton, AtFloatLayout } from 'taro-ui';
import userStore from '../../store/user.store';
import './stroll.scss';
@inject('userStore')
@observer
class Stroll extends Component {
 config = {
 navigationBarTitleText: '逛',
 }
 state = {
 // 开始位置
 startX: '',
 // 开始位置-最终位置距离
 placeX: '',
 // 倾斜角度
 tiltAngle: ['0','0','0','0','0'],
 // 坐标
 x: ['16','16','16','16','16'],
 y: ['16','16','16','16','16'],
 // 是否喜欢状态
 like: [false,false,false,false,false],
 unlike: [false,false,false,false,false],
 // 推荐商品数组
 shopList: [
 {
 id: 1,
 img: 'https://edgefix-image.edgecom.top/ABD846F6672997A7F76CD38E8A57F954.jpg',
 },
 {
 id: 2,
 img: 'https://edgefix-image.edgecom.top/F6E5801C304CC76DA63C02C9FB38B8F4.jpg',
 },
 {
 id: 3,
 img: 'https://edgefix-image.edgecom.top/D518952AD1DD61B2D32556E20CC527C4.jpg',
 },
 {
 id: 4,
 img: 'https://edgefix-image.edgecom.top/1D187E28B349679908A44BBE81F3D3CA.jpg',
 },
 {
 id: 5,
 img: 'https://edgefix-image.edgecom.top/1129A411AC9CF5F81187CBED181B6F57.jpg',
 }
 ]
 }
 componentWillMount () { }
 componentWillReact () { }
 componentDidMount () {
 }
 // 触摸触发
 onTouchStart(index,e) {
 console.log('1111',index,e.touches[0].pageX,e.touches[0].pageY);
 // 重定义数组
 var againX = [];
 var againY = [];
 // 遍历,判断拖动的该数组的位置
 for (var i=0; i<this.state.shopList.length; i++){
 if (i == index) {
 againX[i] = e.touches[0].pageX;
 againY[i] = e.touches[0].pageY;
 } else {
 againX[i] = '16';
 againY[i] = '16';
 }
 }
 // 赋值
 this.setState({
 startX: e.touches[0].pageX,
 x: againX,
 y: againY,
 });
 }
 // 触摸离开
 onTouchMove(index,e) {
 console.log('2222',index,e.touches[0].pageX,e.touches[0].pageY);
 // 重定义数组
 var tiltAngleT = [];
 var againX = [];
 var againY = [];
 // 拖动后相差距离
 let dxplace = e.touches[0].pageX - this.state.startX;
 // 拖动后相差距离进行换算角度
 let dxangle = (e.touches[0].pageX - this.state.startX) * 45 / 500;
 console.log(dxangle);
 // 遍历,判断拖动的该数组的位置
 for (var i=0; i<this.state.shopList.length; i++){
 if (i == index && dxplace > 50) {
 tiltAngleT[i] = dxangle,
 againX[i] = true;
 againY[i] = false;
 } else if (i == index && dxplace <= -50) {
 tiltAngleT[i] = dxangle,
 againX[i] = false;
 againY[i] = true;
 } else if (i == index && dxplace < 50 && dxplace > -50) {
 tiltAngleT[i] = dxangle,
 againX[i] = false;
 againY[i] = false;
 } else {
 tiltAngleT[i] = '0',
 againX[i] = false;
 againY[i] = false;
 }
 }
 // 赋值
 this.setState({
 placeX: dxplace,
 tiltAngle: tiltAngleT,
 like: againX,
 unlike: againY,
 });
 }
 // 取消
 onCancel(index,e) {
 console.log('3333',index,e.changedTouches[0].pageX,e.changedTouches[0].pageY);
 // 赋值
 this.setState({
 tiltAngle: ['0','0','0','0','0'],
 x: ['16','16','16','16','16'],
 y: ['16','16','16','16','16'],
 like: [false,false,false,false,false],
 unlike: [false,false,false,false,false],
 });
 // 如果偏移已经达到则清除第一张图片
 if (this.state.placeX > 50 || this.state.placeX < -50) {
 this.setState({
 shopList: this.state.shopList.splice(1,4),
 });
 }
 }
 // 不喜欢按钮点击
 dislikebtn() {
 // 改变按钮的状态以及图片位置及显示
 this.setState({
 tiltAngle: ['-18','0','0','0','0'],
 x: ['-30','16','16','16','16'],
 y: ['267','16','16','16','16'],
 unlike: [true,false,false,false,false],
 }, () => {
 setTimeout( () => {
 this.setState({
  tiltAngle: ['0','0','0','0','0'],
  x: ['16','16','16','16','16'],
  y: ['16','16','16','16','16'],
  unlike: [false,false,false,false,false],
  shopList: this.state.shopList.splice(1,4),
 });
 },100);
 });
 }
 // 喜欢按钮点击
 likebtn() {
 // 改变按钮的状态以及图片位置及显示
 this.setState({
 tiltAngle: ['18','0','0','0','0'],
 x: ['284','16','16','16','16'],
 y: ['267','16','16','16','16'],
 like: [true,false,false,false,false],
 }, () => {
 setTimeout( () => {
 this.setState({
  tiltAngle: ['0','0','0','0','0'],
  x: ['16','16','16','16','16'],
  y: ['16','16','16','16','16'],
  like: [false,false,false,false,false],
  shopList: this.state.shopList.splice(1,4),
 });
 },100);
 });
 }
 componentWillUnmount () { }
 componentDidShow () {
 }
 componentDidHide () { }
 render() {
 return (
 <View className='stroll-tab'>
 <View className='stroll-text'>
  <Text className='text-tip1'>搭配师每天为你推荐5件单品</Text>
  <View className='text-tip2'>
  <Text className='t1'>右滑喜欢</Text>
  <Image src={require('./img/ic_like.png')} className='icon-image'></Image>
  <Text className='t1'>,左滑不喜欢</Text>
  <Image src={require('./img/ic_dislike.png')} className='icon-image'></Image>
  </View>
 </View>
 {
  this.state.shopList.length != 0&&
  <MovableArea className='stroll-shop'>
  {
  this.state.shopList&&this.state.shopList.map((item,index) => {
  return(
  <MovableView 
   key={item.id}
   onTouchcancel={this.onCancel.bind(this,index)}
   onTouchend={this.onCancel.bind(this,index)}
   onTouchstart={this.onTouchStart.bind(this,index)}
   onTouchmove={this.onTouchMove.bind(this,index)}
   x={this.state.x[index]} 
   y={this.state.y[index]} 
   direction='all' 
   outOfBounds 
   className='shop-imgbox'
  >
   <View className='images-box' style={{transform:'rotate('+this.state.tiltAngle[index]+'deg)'}}>
   <Image src={item.img} className='images'></Image>
   {
   this.state.like[index]==true&&
   <Image src={require('./img/text_like.png')} className='imagelike'></Image>
   }
   {
   this.state.unlike[index]==true&&
   <Image src={require('./img/text_dislike.png')} className='imageunlike'></Image>
   }
   </View>
  </MovableView>
  );})
  }
  </MovableArea>
 }
 {
  this.state.shopList.length === 0&&
  <View className='noshop-card'>
  <Image src={require('./img/noshop.png')} className='noshop-image'></Image>
  </View>
 }
 <View className='stroll-fotter'>
  {
  this.state.shopList.length != 0&&
  <View className='fot-twoimg'>
  {
  this.state.unlike[0]==false&&
  <Image src={require('./img/dislike_default.png')} className='dislike-image' onClick={this.dislikebtn.bind(this)}></Image>
  }
  {
  this.state.unlike[0]==true&&
  <Image src={require('./img/dislike_click.png')} className='dislike-image'></Image>
  }
  {
  this.state.like[0]==false&&
  <Image src={require('./img/like_default.png')} className='like-image' onClick={this.likebtn.bind(this)}></Image>
  }
  {
  this.state.like[0]==true&&
  <Image src={require('./img/like_click.png')} className='like-image'></Image>
  }
  </View>
  }
  <Text className='fot-text'>查看我喜欢的</Text>
 </View>
 </View>
 );
 }
}
export default Stroll;

css文件:

page {
 height: 100%;
 background: #F6F6F6;
}
.stroll-tab {
 width: 100%;
 min-height: 100vh;
 background: #F6F6F6;
 .stroll-text {
 width: 100%;
 margin-top: 40px;
 display: flex;
 flex-direction: column;
 align-items: center;
 .text-tip1 {
 font-size: 28px;
 color: #333333;
 }
 .text-tip2 {
 display: flex;
 flex-direction: row;
 align-items: center;
 .t1 {
 font-size: 28px;
 color: #333333;
 }
 .icon-image {
 width:20px;
 height:20px;
 }
 }
 }
 .stroll-shop {
 width: 100%;
 height: 700px;
 margin-top: 40px;
 .shop-imgbox {
 height: 600px;
 border-radius: 24px;
 .images-box {
 width: 100%;
 height: 520px;
 border-radius: 24px;
 box-shadow: 0px 2px 5px 0px rgba(0,0,0,0.1);
 background-color: #fff;
 position: relative;
 .images {
  width: 606px;
  height: 480px;
  position: absolute;
  left: 40px;
  top: 20px;
 }
 .imagelike {
  width: 96px;
  height: 48px;
  position: absolute;
  right: 40px;
  top: 20px;
 }
 .imageunlike {
  width: 148px;
  height: 48px;
  position: absolute;
  left: 40px;
  top: 20px;
 }
 }
 }
 .shop-imgbox:nth-child(1) {
 width: 686px;
 z-index: 50;
 }
 .shop-imgbox:nth-child(2) {
 width: 676px;
 z-index: 40;
 margin: 15px 0px 0px 5px;
 }
 .shop-imgbox:nth-child(3) {
 width: 666px;
 z-index: 30;
 margin: 30px 0px 0px 10px;
 }
 .shop-imgbox:nth-child(4) {
 width: 656px;
 z-index: 20;
 margin: 0px 0px 0px 15px;
 }
 .shop-imgbox:nth-child(5) {
 width: 646px;
 z-index: 10;
 margin: 0px 0px 0px 20px;
 }
 }
 .noshop-card {
 width: 100%;
 margin-top: 40px;
 padding: 0px 16px;
 .noshop-image {
 width: 100%;
 height: 806px;
 }
 }
 .stroll-fotter {
 width: 100%;
 display: flex;
 flex-direction: column;
 align-items: center;
 margin-top: 20px;
 .fot-twoimg {
 display: flex;
 flex-direction: row;
 align-items: center;
 .dislike-image {
 width: 120px;
 height: 120px;
 }
 .like-image {
 width: 120px;
 height: 120px;
 margin-left: 48px;
 }
 }
 .fot-text {
 color: #368BE5;
 font-size: 28px;
 margin-top: 40px;
 margin-bottom: 50px;
 }
 }
}

总结