vue如何实现列表滚动的过渡动画

本文实例为大家分享了Vue实现列表滚动过渡动画的具体代码，供大家参考，具体内容如下

效果图

失帧比较严重，在手机上效果更佳。

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。

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"
 :style="{ backgroundImage: 'url('+item.thumbUrl+')', 'opacity': (index < startIndex || index > endIndex) ? 0 : 1}">
  <div class="content">
  <h2 class="num">{{item.num}}</h2>
  <div style="vertical-align:text-bottom">
   <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 ? 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" style="height: 100%;">
 <scroll ref="scroll" class="address-content" :data="areaList" @scroll="scroll" :listen-scroll="listenScroll" :probe-type="probeType" :bounce="false">
 <div>
  <div v-if="bannerList.length" style="position: relative;">
  <slider :list="bannerList">
   <div v-for="item in bannerList" :key="item.id" :style="{height: sliderHeight + 'px'}">
   <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"
  :style="{ backgroundImage: 'url('+item.thumbUrl+')', 'opacity': (index < startIndex || index > endIndex) ? 0 : 1}">
   <div class="content">
   <h2 class="num">{{item.num}}</h2>
   <div style="vertical-align:text-bottom">
    <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 ? 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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