---
title: 轮播
date: 2023-05-28 16:17:38
permalink: /pages/component/swiper
article: false
---

## 全屏限高轮播

1. 添加类名 `screen-swiper`，宽度为全屏，高度自定义

2. 请直接参考 `swiper` [官方文档](https://uniapp.dcloud.net.cn/component/swiper.html#)，可以通过类名 `square-dot` 和 `round-dot` 定义小圆点样式

```vue
<template>
	<view>
		<swiper class="screen-swiper" :class="dotStyle?'square-dot':'round-dot'" :indicator-dots="true" :circular="true"
		 :autoplay="true" interval="5000" duration="500">
			<swiper-item v-for="(item,index) in swiperList" :key="index">
				<image :src="item.url" mode="aspectFill" v-if="item.type=='image'"></image>
				<video :src="item.url" autoplay loop muted :show-play-btn="false" :controls="false" objectFit="cover" v-if="item.type=='video'"></video>
			</swiper-item>
		</swiper>
	</view>
</template>
 
<script>
	export default {
		data() {
			return {
				swiperList: [{
					id: 0,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big84000.jpg'
				}, {
					id: 1,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big37006.jpg',
				}, {
					id: 2,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big39000.jpg'
				}, {
					id: 3,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big10001.jpg'
				}],
				dotStyle: true
			};
		}
	}
</script>
```

## 卡片式轮播

1. 在 `swiper` 标签上添加类名 `card-swiper`

2. 在 `swiper-item` 标签内的子元素上添加类名 `swiper-item`，

3. 示例中 `cardSwiper` 函数的主要作用是切换类名 `cur`，`cur` 的作用是实现轮播图片中间大，两边小的效果，就是 `transform的scale()`

```vue
<swiper class="card-swiper" :class="dotStyle?'square-dot':'round-dot'" :indicator-dots="true" :circular="true"
 :autoplay="true" interval="5000" duration="500" @change="cardSwiper" indicator-color="#8799a3"
 indicator-active-color="#0081ff">
	<swiper-item v-for="(item,index) in swiperList" :key="index" :class="cardCur==index?'cur':''">
		<view class="swiper-item">
			<image :src="item.url" mode="aspectFill" v-if="item.type=='image'"></image>
			<video :src="item.url" autoplay loop muted :show-play-btn="false" :controls="false" objectFit="cover" v-if="item.type=='video'"></video>
		</view>
	</swiper-item>
</swiper>
 
<!-- js -->
cardSwiper(e) {
    this.cardCur = e.detail.current
},
```

## 堆叠式轮播

1. 堆叠轮播是原生写的，注意类名 `tower-swiper`、`tower-item` 以及 `swiper-item` 的配合使用，这主要是通过层级的高低来显示图片的，使用时需要配合 `js` 和 `css`。

2. 注：这种轮播图初始化展示第一章会便宜一点，需要触动一下才会展示正常的效果，可以通过在 `onload()` 函数中给变量 `direction` 赋值解决

```vue
<template>
	<view>
		<view class="tower-swiper" @touchmove="TowerMove" @touchstart="TowerStart" @touchend="TowerEnd">
			<view class="tower-item" :class="item.zIndex==1?'none':''" v-for="(item,index) in swiperList" :key="index" :style="[{'--index': item.zIndex,'--left':item.mLeft}]" :data-direction="direction">
				<view class="swiper-item">
					<image :src="item.url" mode="aspectFill" v-if="item.type=='image'"></image>
					<video :src="item.url" autoplay loop muted :show-play-btn="false" :controls="false" objectFit="cover" v-if="item.type=='video'"></video>
				</view>
			</view>
		</view>
	</view>
</template>
 
<script>
	export default {
		data() {
			return {
				swiperList: [{
					id: 0,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big84000.jpg'
				}, {
					id: 1,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big37006.jpg',
				}, {
					id: 2,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big39000.jpg'
				}, {
					id: 3,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big10001.jpg'
				}, {
					id: 4,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big25011.jpg'
				}, {
					id: 5,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big21016.jpg'
				}, {
					id: 6,
					type: 'image',
					url: 'https://ossweb-img.qq.com/images/lol/web201310/skin/big99008.jpg'
				}],
				towerStart: 0,
				direction: ''
			};
		},
		onLoad() {
			this.TowerSwiper('swiperList');
                        this.direction = 'left';
			// 初始化towerSwiper 传已有的数组名即可
		}, 
		methods: {
			// 初始化towerSwiper
			TowerSwiper(name) {
				let list = this[name];
				console.log(list)
				for (let i = 0; i < list.length; i++) {
					list[i].zIndex = parseInt(list.length / 2) + 1 - Math.abs(i - parseInt(list.length / 2))
					list[i].mLeft = i - parseInt(list.length / 2)
				}
				this.swiperList = list
			},
			// towerSwiper触摸开始
			TowerStart(e) {
				console.log(e)
				this.towerStart = e.touches[0].pageX
			},
			// towerSwiper计算方向
			TowerMove(e) {
				this.direction = e.touches[0].pageX - this.towerStart > 0 ? 'right' : 'left'
			},
			// towerSwiper计算滚动
			TowerEnd(e) {
				let direction = this.direction;
				let list = this.swiperList;
				if (direction == 'right') {
					let mLeft = list[0].mLeft;
					console.log(list[0])
					let zIndex = list[0].zIndex;
					for (let i = 1; i < this.swiperList.length; i++) {
						this.swiperList[i - 1].mLeft = this.swiperList[i].mLeft
						this.swiperList[i - 1].zIndex = this.swiperList[i].zIndex
					}
					this.swiperList[list.length - 1].mLeft = mLeft;
					this.swiperList[list.length - 1].zIndex = zIndex;
				} else {
					let mLeft = list[list.length - 1].mLeft;
					let zIndex = list[list.length - 1].zIndex;
					for (let i = this.swiperList.length - 1; i > 0; i--) {
						this.swiperList[i].mLeft = this.swiperList[i - 1].mLeft
						this.swiperList[i].zIndex = this.swiperList[i - 1].zIndex
					}
					this.swiperList[0].mLeft = mLeft;
					this.swiperList[0].zIndex = zIndex;
				}
				this.direction = ""
				this.swiperList = this.swiperList
			},
		}
	}
</script>
 
<style>
	.tower-swiper .tower-item {
		transform: scale(calc(0.5 + var(--index) / 10));
		margin-left: calc(var(--left) * 100upx - 150upx);
		z-index: var(--index);
	}
</style>
```

## 轮播图相关class 

|class|	说明|	可选值|
|--|	--|	--|
|screen-swiper|	全屏限高轮播|	——|
|square-dot|	方形指示点|	——|
|round-dot|	圆形指示点|	——|
|card-swiper|	卡片式轮播|	——|
|swiper-item|	滑动切换区域（具体看示例）	|——|
|tower-swiper|	堆叠式轮播	|——|
|tower-item|	堆叠式轮播子元素|	——|