vue如何实现列表滚动的过渡动画

发布时间：2020-06-29 17:35:35 来源：亿速云阅读：809 作者：清晨栏目：开发技术

这篇文章主要介绍vue如何实现列表滚动的过渡动画，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们一定要看完！

效果图

失帧比较严重，在手机上效果更佳。

vue如何实现列表滚动的过渡动画

原理分析

这个滚动页面由两个部分布局（底部固定的Tab页面除外）。一个是顶部的banner轮播，一个是下面的列表。这里的重点是做列表的动画，banner轮播的网上资料很多，请自行查找。

vue如何实现列表滚动的过渡动画

这个动画最重要的是在滚动中实时计算startIndex和endIndex，动画比较简单，就是scale和opacity的变化。向下滚动时，startIndex变小；向上滚动时，endIndex变大时，新露脸的项做该动画。当滚动连起来，就是一个完整的动画了。

涉及的技术

使用better-scroll做滚动以及轮播图

使用create-keyframe-animation做动画控制

实现步骤

1、vue的template部分

注意：由于IOS渲染速度比较快, 必须把没有展现在首屏的页面上的item隐藏掉，即index比startIndex小、比endIndex大的item都应该隐藏，避免页面动画混乱。

<div class="area-wrapper" ref="areaWrapper">
  <div v-for="(item, index) in areaList" :key="index"
  @click="clickAreaItem(item.id)"
  :ref="'area-' + index" class="area"
  :>
    <div class="content">
    <h3 class="num">{{item.num}}</h3>
    <div >
      <p class="name">{{item.name}}</p>
      <p class="desc">{{item.desc}}</p>
    </div>
    </div>
  </div>
</div>

高度预设。用于计算startIndex、endIndex

const AreaItemHeight = 119 // 每一项的高度（这里默认一致，如果不一致请自行修改startIndex、endIndex的计算方式）
const MarginBottom = 15   // 列表项的底部边距
const TopHeight = 160    // banner的高度
const BottomHeight = 50   // 底部Tab的高度

监听滚动。并实时计算startIndex、endIndex

scroll (position) {
  const scrollY = position.y
  if (scrollY < 0) {
    // startIndex计算
    const currentStartIndex = Math.abs(scrollY) <= TopHeight &#63; 0 : parseInt((Math.abs(scrollY) - TopHeight) / (AreaItemHeight + MarginBottom))
    // endIndex计算
    let currentEndIndex = Math.floor((window.innerHeight - (TopHeight + scrollY) - BottomHeight) / (AreaItemHeight + MarginBottom))
    if (currentEndIndex > this.areaList.length - 1) {
      currentEndIndex = this.areaList.length - 1
    }
    // 这里使用vue的watch属性监听更好
    if (currentStartIndex !== this.startIndex) {
      if (currentStartIndex < this.startIndex) {
        // 运行动画
        this.runAnimation(currentStartIndex)
      }
      this.startIndex = currentStartIndex
    }
    // 这里使用vue的watch属性监听更好
    if (currentEndIndex !== this.endIndex) {
      if (currentEndIndex > this.endIndex) {
      this.runAnimation(currentEndIndex)
      }
      this.endIndex = currentEndIndex
    }
  }
}

运行动画

runAnimation (index) {
  animations.registerAnimation({
    name: 'scale',
    animation: [
      {
      scale: 0.5,
      opacity: 0
      },
      {
      scale: 1,
      opacity: 1
      }
    ],
    presets: {
      duration: 300,
      resetWhenDone: true
    }
  })
  animations.runAnimation(this.$refs['area-' + index], 'scale')
}

完整代码

.vue文件

<template>
<div class="address-wrapper" >
 <scroll ref="scroll" class="address-content" :data="areaList" @scroll="scroll" :listen-scroll="listenScroll" :probe-type="probeType" :bounce="false">
  <div>
   <div v-if="bannerList.length" >
    <slider :list="bannerList">
     <div v-for="item in bannerList" :key="item.id" :>
      <img class="needsclick" :src="item.thumbUrl" width="100%" height="100%" />
     </div>
    </slider>
    <div class="banner-bg"></div>
    <div class="banner-bg-1"></div>
   </div>

   <div class="area-wrapper" ref="areaWrapper">
    <div v-for="(item, index) in areaList" :key="index"
    @click="clickAreaItem(item.id)"
    :ref="'area-' + index" class="area"
    :>
     <div class="content">
      <h3 class="num">{{item.num}}</h3>
      <div >
       <p class="name">{{item.name}}</p>
       <p class="desc">{{item.desc}}</p>
      </div>
      <!-- <div></div> -->
     </div>
    </div>
   </div>
  </div>
 </scroll>
 <router-view />
</div>
</template>

<script>
import Slider from '@/components/slider/slider'
import Scroll from '@/components/scroll/scroll'
import { isIphoneX } from '@/assets/js/brower'
import animations from 'create-keyframe-animation'
import axios from '@/api/axiosApi'
import areaList from '@/assets/json/areaList.json'
import bannerList from '@/assets/json/bannerAddress.json'

// 每一个的Area的高度，都是一样的
const AreaItemHeight = 119
const MarginBottom = 15
const TopHeight = 160
const BottomHeight = 50

export default {
 data () {
  return {
   startIndex: 0,
   endIndex: 3,
   bannerList,
   areaList
  }
 },
 components: {
  Slider, Scroll
 },
 created () {
  this.probeType = 3
  this.listenScroll = true
  this.sliderHeight = 210 + 20
  if (isIphoneX()) {
   this.sliderHeight += 34
  }

  this._getBanner()
  this._getAddressList()
 },
 mounted () {
  this.endIndex = Math.floor((window.innerHeight - TopHeight - BottomHeight) / (AreaItemHeight + MarginBottom))
 },
 methods: {
  _getBanner () {
   axios.get(this, '/v1/banner/1', null, (data) => {
    data.forEach(item => {
     item.thumbUrl += '-banner'
    })
    this.bannerList = data
   }, null, false)
  },
  _getAddressList () {
   axios.get(this, '/v1/address/1', {
    pageSize: 30
   }, (data) => {
    // data.forEach(item => {
    //  item.thumbUrl += '-tiaomu'
    // })
    this.areaList = data
   }, null, false)
  },
  scroll (position) {
   const scrollY = position.y
   if (scrollY < 0) {
    const currentStartIndex = Math.abs(scrollY) <= TopHeight &#63; 0 : parseInt((Math.abs(scrollY) - TopHeight) / (AreaItemHeight + MarginBottom))
    let currentEndIndex = Math.floor((window.innerHeight - (TopHeight + scrollY) - BottomHeight) / (AreaItemHeight + MarginBottom))
    if (currentEndIndex > this.areaList.length - 1) {
     currentEndIndex = this.areaList.length - 1
    }

    if (currentStartIndex !== this.startIndex) {
     if (currentStartIndex < this.startIndex) {
      this.runAnimation(currentStartIndex)
     }
     this.startIndex = currentStartIndex
    }
    if (currentEndIndex !== this.endIndex) {
     if (currentEndIndex > this.endIndex) {
      this.runAnimation(currentEndIndex)
     }
     this.endIndex = currentEndIndex
    }
   }
  },
  runAnimation (index) {
   animations.registerAnimation({
    name: 'scale',
    animation: [
     {
      scale: 0.5,
      opacity: 0
     },
     {
      scale: 1,
      opacity: 1
     }
    ],
    presets: {
     duration: 300,
     resetWhenDone: true
    }
   })
   animations.runAnimation(this.$refs['area-' + index], 'scale')
  },
  clickAreaItem (id) {
   this.$router.push(`address/addressDetail/${id}`)
  }
 }
}
</script>

<style lang="stylus" scoped>
.address-wrapper {
 .address-content {
  height: 100%;
  overflow: hidden;

  .banner-bg {
   height: 50px;
   width: 100%;
   position: absolute;
   bottom: -1px;
   background:-moz-linear-gradient(top, rgba(249, 250, 252, 0.3), rgba(249, 250, 252, 1));/*火狐*/
   background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgba(249, 250, 252, 0.3)), to(rgba(249, 250, 252, 1))); /*谷歌*/
   background-image: -webkit-gradient(linear,left bottom,left top,color-start(0, rgba(249, 250, 252, 0.3)),color-stop(1, rgba(249, 250, 252, 1)));/* Safari & Chrome*/
  }

  .banner-bg-1 {
   height: 20px;
   width: 100%;
   position: absolute;
   bottom: 49px;
   background:-moz-linear-gradient(top, rgba(249, 250, 252, 0), rgba(249, 250, 252, 0.3));/*火狐*/
   background: -webkit-gradient(linear, 0% 0%, 0% 100%, from(rgba(249, 250, 252, 0)), to(rgba(249, 250, 252, 0.3))); /*谷歌*/
   background-image: -webkit-gradient(linear,left bottom,left top,color-start(0, rgba(249, 250, 252, 0)),color-stop(1, rgba(249, 250, 252, 0.3)));/* Safari & Chrome*/
  }

  .area-wrapper {
   transform: translateY(-45px)
   padding: 0 15px;
   z-index: 1;

   .area {
    margin-bottom: 15px;
    height: 119px;
    width: 100%;
    border-radius: 10px;
    background-repeat: no-repeat;
    background-size: cover;
    box-shadow: 0 0 10px #a4a3a3;
    display: flex;
    align-items: flex-end;

    .content {
     color: #fff;
     display: flex;
     padding-right: 60px;
     padding-bottom: 15px;
     line-height: 1.2;

     .num {
      bottom: 35px;
      font-size: 48px;
      font-weight: 100;
      padding: 0 15px;
      display:table-cell;
      vertical-align:bottom;
     }

     .name {
      font-size: 21px;
      font-weight: 600;
      line-height: 1.7;
     }

     .desc {
      font-size: 14px;
     }
    }
   }
  }
 }
}
</style>

本地json文件,请自行修改图片路径

bannerAddress.json

[
 {
  "id": 1,
  "contentId": 111111,
  "type": 1,
  "thumbUrl": "./static/img/banner/banner_address_1.jpg"
 },
 {
  "id": 2,
  "contentId": 111111,
  "type": 1,
  "thumbUrl": "./static/img/banner/banner_address_2.jpg"
 },
 {
  "id": 3,
  "contentId": 111111,
  "type": 1,
  "thumbUrl": "./static/img/banner/banner_address_3.jpg"
 }
]

areaList.json

[
 {
  "id": "ba062c32fdf611e7ba2d00163e0c27f8",
  "name": "凯里",
  "desc": "这是凯里哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/kaili.png"
 }, {
  "id": "ba5287a7fdf611e7ba2d00163e0c27f8",
  "name": "丹寨",
  "desc": "这是丹寨哟~",
  "num": 8,
  "thumbUrl": "./static/img/area/danzai.png"
 }, {
  "id": "ba9da079fdf611e7ba2d00163e0c27f8",
  "name": "麻江",
  "desc": "这是麻江哟~",
  "num": 12,
  "thumbUrl": "./static/img/area/majiang.png"
 }, {
  "id": "baeb0926fdf611e7ba2d00163e0c27f8",
  "name": "黄平",
  "desc": "这是黄平哟~",
  "num": 7,
  "thumbUrl": "./static/img/area/huangping.png"
 }, {
  "id": "bb357191fdf611e7ba2d00163e0c27f8",
  "name": "施秉",
  "desc": "这是施秉哟~",
  "num": 6,
  "thumbUrl": "./static/img/area/shibing.png"
 }, {
  "id": "bb842d8ffdf611e7ba2d00163e0c27f8",
  "name": "镇远",
  "desc": "这是镇远哟~",
  "num": 3,
  "thumbUrl": "./static/img/area/zhenyuan.png"
 }, {
  "id": "bbce67dffdf611e7ba2d00163e0c27f8",
  "name": "岑巩",
  "desc": "这是岑巩哟~",
  "num": 23,
  "thumbUrl": "./static/img/area/cengong.png"
 }, {
  "id": "bc198ca9fdf611e7ba2d00163e0c27f8",
  "name": "三穗",
  "desc": "这是三穗哟~",
  "num": 66,
  "thumbUrl": "./static/img/area/sansui.png"
 }, {
  "id": "bc64498bfdf611e7ba2d00163e0c27f8",
  "name": "天柱",
  "desc": "这是天柱哟~",
  "num": 128,
  "thumbUrl": "./static/img/area/tianzhu.png"
 }, {
  "id": "bcaf466bfdf611e7ba2d00163e0c27f8",
  "name": "锦屏",
  "desc": "这是锦屏哟~",
  "num": 107,
  "thumbUrl": "./static/img/area/jinping.png"
 }, {
  "id": "bcfa6f1bfdf611e7ba2d00163e0c27f8",
  "name": "黎平",
  "desc": "这是黎平哟~",
  "num": 211,
  "thumbUrl": "./static/img/area/liping.png"
 }, {
  "id": "bd44cca9fdf611e7ba2d00163e0c27f8",
  "name": "从江",
  "desc": "这是从江哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/congjiang.png"
 }, {
  "id": "bd8f5cd4fdf611e7ba2d00163e0c27f8",
  "name": "榕江",
  "desc": "这是榕江哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/rongjiang.png"
 }, {
  "id": "bdda2928fdf611e7ba2d00163e0c27f8",
  "name": "雷山",
  "desc": "这是雷山哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/leishan.png"
 }, {
  "id": "be25afc0fdf611e7ba2d00163e0c27f8",
  "name": "台江",
  "desc": "这是台江哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/taijiang.png"
 }, {
  "id": "be702db5fdf611e7ba2d00163e0c27f8",
  "name": "剑河",
  "desc": "这是剑河哟~",
  "num": 17,
  "thumbUrl": "./static/img/area/jianhe.png"
 }
]

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