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<template> <view class="u-swiper-wrap" :style="{ borderRadius: `${borderRadius}rpx` }"> <swiper :current="elCurrent" @change="change" @animationfinish="animationfinish" :interval="interval" :circular="circular" :duration="duration" :autoplay="autoplay" :previous-margin="effect3d ? effect3dPreviousMargin + 'rpx' : '0'" :next-margin="effect3d ? effect3dPreviousMargin + 'rpx' : '0'" :style="{ height: height + 'rpx', backgroundColor: bgColor }"> <swiper-item class="u-swiper-item" v-for="(item, index) in list" :key="index"> <view class="u-list-image-wrap" @tap.stop.prevent="listClick(index)" :class="[uCurrent != index ? 'u-list-scale' : '']" :style="{ borderRadius: `${borderRadius}rpx`, transform: effect3d && uCurrent != index ? 'scaleY(0.9)' : 'scaleY(1)', margin: effect3d && uCurrent != index ? '0 20rpx' : 0, }"> <image class="u-swiper-image" :src="item[name] || item" :mode="imgMode"></image> <view v-if="title && item.title" class="u-swiper-title u-line-1" :style="[{ 'padding-bottom': titlePaddingBottom }, titleStyle]"> {{ item.title }} </view> </view> </swiper-item> </swiper> <view class="u-swiper-indicator" :style="{ top: indicatorPos == 'topLeft' || indicatorPos == 'topCenter' || indicatorPos == 'topRight' ? '12rpx' : 'auto', bottom: indicatorPos == 'bottomLeft' || indicatorPos == 'bottomCenter' || indicatorPos == 'bottomRight' ? '12rpx' : 'auto', justifyContent: justifyContent, padding: `0 ${effect3d ? '74rpx' : '24rpx'}` }"> <block v-if="mode == 'rect'"> <view class="u-indicator-item-rect" :class="{ 'u-indicator-item-rect-active': index == uCurrent }" v-for="(item, index) in list" :key="index"></view> </block> <block v-if="mode == 'dot'"> <view class="u-indicator-item-dot" :class="{ 'u-indicator-item-dot-active': index == uCurrent }" v-for="(item, index) in list" :key="index"></view> </block> <block v-if="mode == 'round'"> <view class="u-indicator-item-round" :class="{ 'u-indicator-item-round-active': index == uCurrent }" v-for="(item, index) in list" :key="index"></view> </block> <block v-if="mode == 'number'"> <view class="u-indicator-item-number">{{ uCurrent + 1 }}/{{ list.length }}</view> </block> </view> </view> </template>
<script> /** * swiper 轮播图 * @description 该组件一般用于导航轮播,广告展示等场景,可开箱即用 * @tutorial https://www.uviewui.com/components/swiper.html
* @property {Array} list 轮播图数据,见官网"基本使用"说明 * @property {Boolean} title 是否显示标题文字,需要配合list参数,见官网说明(默认false) * @property {String} mode 指示器模式,见官网说明(默认round) * @property {String Number} height 轮播图组件高度,单位rpx(默认250) * @property {String} indicator-pos 指示器的位置(默认bottomCenter) * @property {Boolean} effect3d 是否开启3D效果(默认false) * @property {Boolean} autoplay 是否自动播放(默认true) * @property {String Number} interval 自动轮播时间间隔,单位ms(默认2500) * @property {Boolean} circular 是否衔接播放,见官网说明(默认true) * @property {String} bg-color 背景颜色(默认#f3f4f6) * @property {String Number} border-radius 轮播图圆角值,单位rpx(默认8) * @property {Object} title-style 自定义标题样式 * @property {String Number} effect3d-previous-margin mode = true模式的情况下,激活项与前后项之间的距离,单位rpx(默认50) * @property {String} img-mode 图片的裁剪模式,详见image组件裁剪模式(默认aspectFill) * @event {Function} click 点击轮播图时触发 * @example <u-swiper :list="list" mode="dot" indicator-pos="bottomRight"></u-swiper> */ export default { name: "u-swiper", props: { // 轮播图的数据,格式如:[{image: 'xxxx', title: 'xxxx'},{image: 'yyyy', title: 'yyyy'}],其中title字段可选
list: { type: Array, default () { return []; } }, // 是否显示title标题
title: { type: Boolean, default: false }, // 用户自定义的指示器的样式
indicator: { type: Object, default () { return {}; } }, // 圆角值
borderRadius: { type: [Number, String], default: 8 }, // 隔多久自动切换
interval: { type: [String, Number], default: 3000 }, // 指示器的模式,rect|dot|number|round
mode: { type: String, default: 'round' }, // list的高度,单位rpx
height: { type: [Number, String], default: 250 }, // 指示器的位置,topLeft|topCenter|topRight|bottomLeft|bottomCenter|bottomRight
indicatorPos: { type: String, default: 'bottomCenter' }, // 是否开启缩放效果
effect3d: { type: Boolean, default: false }, // 3D模式的情况下,激活item与前后item之间的距离,单位rpx
effect3dPreviousMargin: { type: [Number, String], default: 50 }, // 是否自动播放
autoplay: { type: Boolean, default: true }, // 自动轮播时间间隔,单位ms
duration: { type: [Number, String], default: 500 }, // 是否衔接滑动,即到最后一张时接着滑动,是否自动切换到第一张
circular: { type: Boolean, default: true }, // 图片的裁剪模式
imgMode: { type: String, default: 'aspectFill' }, // 从list数组中读取的图片的属性名
name: { type: String, default: 'image' }, // 背景颜色
bgColor: { type: String, default: '#f3f4f6' }, // 初始化时,默认显示第几项
current: { type: [Number, String], default: 0 }, // 标题的样式,对象形式
titleStyle: { type: Object, default() { return {} } } }, watch: { // 如果外部的list发生变化,判断长度是否被修改,如果前后长度不一致,重置uCurrent值,避免溢出
list(nVal, oVal) { if(nVal.length !== oVal.length) this.uCurrent = 0; }, // 监听外部current的变化,实时修改内部依赖于此测uCurrent值,如果更新了current,而不是更新uCurrent,
// 就会错乱,因为指示器是依赖于uCurrent的
current(n) { this.uCurrent = n; } }, data() { return { uCurrent: this.current // 当前活跃的swiper-item的index
}; }, computed: { justifyContent() { if (this.indicatorPos == 'topLeft' || this.indicatorPos == 'bottomLeft') return 'flex-start'; if (this.indicatorPos == 'topCenter' || this.indicatorPos == 'bottomCenter') return 'center'; if (this.indicatorPos == 'topRight' || this.indicatorPos == 'bottomRight') return 'flex-end'; }, titlePaddingBottom() { let tmp = 0; if (this.mode == 'none') return '12rpx'; if (['bottomLeft', 'bottomCenter', 'bottomRight'].indexOf(this.indicatorPos) >= 0 && this.mode == 'number') { tmp = '60rpx'; } else if (['bottomLeft', 'bottomCenter', 'bottomRight'].indexOf(this.indicatorPos) >= 0 && this.mode != 'number') { tmp = '40rpx'; } else { tmp = '12rpx'; } return tmp; }, // 因为uni的swiper组件的current参数只接受Number类型,这里做一个转换
elCurrent() { return Number(this.current); } }, methods: { listClick(index) { this.$emit('click', index); }, change(e) { let current = e.detail.current; this.uCurrent = current; // 发出change事件,表示当前自动切换的index,从0开始
this.$emit('change', current); }, // 头条小程序不支持animationfinish事件,改由change事件
// 暂不监听此事件,因为不再给swiper绑定uCurrent属性
animationfinish(e) { // #ifndef MP-TOUTIAO
// this.uCurrent = e.detail.current;
// #endif
} } }; </script>
<style lang="scss" scoped> @import "../../libs/css/style.components.scss"; .u-swiper-wrap { position: relative; overflow: hidden; transform: translateY(0); }
.u-swiper-image { width: 100%; will-change: transform; height: 100%; /* #ifndef APP-NVUE */ display: block; /* #endif */ /* #ifdef H5 */ pointer-events: none; /* #endif */ }
.u-swiper-indicator { padding: 0 24rpx; position: absolute; @include vue-flex; width: 100%; z-index: 1; }
.u-indicator-item-rect { width: 26rpx; height: 8rpx; margin: 0 6rpx; transition: all 0.5s; background-color: rgba(0, 0, 0, 0.3); }
.u-indicator-item-rect-active { background-color: rgba(255, 255, 255, 0.8); }
.u-indicator-item-dot { width: 14rpx; height: 14rpx; margin: 0 6rpx; border-radius: 20rpx; transition: all 0.5s; background-color: rgba(0, 0, 0, 0.3); }
.u-indicator-item-dot-active { background-color: rgba(255, 255, 255, 0.8); }
.u-indicator-item-round { width: 14rpx; height: 14rpx; margin: 0 6rpx; border-radius: 20rpx; transition: all 0.5s; background-color: rgba(0, 0, 0, 0.3); }
.u-indicator-item-round-active { width: 34rpx; background-color: rgba(255, 255, 255, 0.8); }
.u-indicator-item-number { padding: 6rpx 16rpx; line-height: 1; background-color: rgba(0, 0, 0, 0.3); border-radius: 100rpx; font-size: 26rpx; color: rgba(255, 255, 255, 0.8); }
.u-list-scale { transform-origin: center center; }
.u-list-image-wrap { width: 100%; height: 100%; flex: 1; transition: all 0.5s; overflow: hidden; box-sizing: content-box; position: relative; }
.u-swiper-title { position: absolute; background-color: rgba(0, 0, 0, 0.3); bottom: 0; left: 0; width: 100%; font-size: 28rpx; padding: 12rpx 24rpx; color: rgba(255, 255, 255, 0.9); }
.u-swiper-item { @include vue-flex; overflow: hidden; align-items: center; } </style>
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