微信小程序滑动窗口(微信小程序实现滑动/点击切换Tab)
背景
👏 swiper+scroll-view实现滑动/点击切换Tab ,以及scroll-left的使用~
🥇文末分享源代码 。记得点赞+关注+收藏!
1.实现效果
2.实现步骤
2.1 scroll-view实现tab列表
scroll-view:
可滚动视图区域 。使用竖向滚动时 ,需要给scroll-view一个固定高度 ,通过 WXSS 设置 height 。组件属性的长度单位默认为px 。
scroll-x(boolean):允许横向滚动
scroll-y(boolean):允许纵向滚动
scroll-left(number/string):设置横向滚动条位置
scroll-with-animation(boolean):在设置滚动条位置时使用动画过渡 定义一个tab列表 ,scroll-view包裹 ,允许横向滚动 ,设置scroll-left默认为0 每个tab设置为display: inline-block ,scroll-view设置 white-space: nowrap不换行 <scroll-view scroll-x class="container-head-sc" scroll-left="{{sleft}}" scroll-with-animation="true"> <view class="item" wx:key="list" wx:for="{{list}}" wx:for-index="index">tab-{{index+1}} </view> </scroll-view> .container-head-sc { height: 50rpx; border-radius: 25rpx; background: #eeece4; color: #333; white-space: nowrap; } .container-head-sc .item { padding: 0 20rpx; min-width: 90rpx; text-align: center; line-height: 50rpx; font-size: 26rpx; display: inline-block; height: 50rpx; } 给每个tab设置vertical-align: top;防止高度塌陷 .container-head-sc .item{ /* 防止高度塌陷 */ + vertical-align: top; } 添加当前激活tab样式 ,定义当前选中项索引currentTab默认为0(即选中第一个) ,当currentTab==列表的某一项索引表示选中
<view class="item {{currentTab == index ?active:}}" data-current="{{index}}" catchtap="handleTabChange" wx:key="list" wx:for="{{list}}" wx:for-index="index">tab-{{index+1}} </view> .container-head-sc .active { color: #ffffff; font-weight: bold; background: orange; border-radius: 25rpx; } 添加切换事件
handleTabChange(e) { let { current } = e.target.dataset; if (this.data.currentTab == current || current === undefined) return; this.setData({ currentTab: current, }); },2.2 swiper+scroll-iew 实现内容列表
swiper:
滑块视图容器 。默认高度为150px;
current(number):当前所在滑块的 index ,默认为0
autoplay(boolean):是否自动切换
bindchange(eventhandle):current 改变时会触发 change 事件 ,event.detail = {current, source} swiper包裹内容列表 ,需要为swiper指定高度,这里我们设置为撑满一屏 /* swiper默认高度为150px */ .container-swiper { height: calc(100% - 110rpx); } 设置swiper的current为当前选中的tab标签索引 ,即currentTab <swiper current="{{currentTab}}" class="container-swiper"> <swiper-item class="flex-column j_c" wx:for="{{list}}" wx:key=index> </swiper-item> </swiper> swiper-item展示内容列表 ,用scroll-view包裹内容,设置竖向滚动 ,使用竖向滚动时 ,需要给scroll-view一个固定高度 ,这里将scroll-view高度设置为100% ,与swiper同高 ,铺满一屏 <swiper-item class="flex-column j_c" wx:for="{{list}}" wx:key=index> <scroll-view scroll-y class="container-swiper-sc"> <view class="flex-wrap flex-row items"> ....//内容 </view> </scroll-view> </swiper-item> .container-swiper-sc { height: 100%; } swiper添加bindchange事件 ,当滑动时候 ,动态的设置currentTab ,实现tab列表的同步更新
<swiper current="{{currentTab}}" bindchange="handleSwiperChange" class="container-swiper"> ....//内容 </swiper> handleSwiperChange(e) { this.setData({ currentTab: e.detail.current, }); }, 可以发现 ,当swiper所在滑块的 index超出tab列表的可视范围 ,我们得手动滑动tab列表才能看见当前所选中的tab 找到2.1节 scroll-left=“{{sleft}} ” ,scroll-left用来设置横向滚动条位置 ,也就是说,我们可以监听swiper的滚动 ,在滑块所在的index改变的时候 ,去动态的设置scroll-left的位置 scroll-left的计算wx.createSelectorQuery():
返回一个 SelectorQuery 对象实例
SelectorQuery.selectAll(string selector):
在当前页面下选择匹配选择器 selector 的所有节点 。 getScrollLeft() { const query = wx.createSelectorQuery(); query.selectAll(".item").boundingClientRect(); //这里将会返回页面中所有class为item的节点,个数为tab列表的长度 query.exec((res) => { let num = 0; for (let i = 0; i < this.data.currentTab; i++) { num += res[0][i].width; } // 计算当前currentTab之前的宽度总和 this.setData({ sleft: Math.ceil(num), }); }); }, 修改swiper的bindchange事件 ,每次滑块的变化 ,都重新计算scroll-left的大小
handleSwiperChange(e) { + this.getScrollLeft(); },3.实现代码
<view class="head flex-row"> <view class="head-title">scroll-left</view> </view> <scroll-view scroll-y class="container"> <view class="container-head flex-row"> <scroll-view scroll-x class="container-head-sc" scroll-left="{{sleft}}" scroll-with-animation="true"> <view class="item {{currentTab == index ?active:}}" data-current="{{index}}" catchtap="handleTabChange" wx:key="list" wx:for="{{list}}" wx:for-index="index">tab-{{index+1}} </view> </scroll-view> </view> <swiper current="{{currentTab}}" bindchange="handleSwiperChange" class="container-swiper"> <swiper-item class="flex-column j_c" wx:for="{{list}}" wx:key=index> <scroll-view scroll-y class="container-swiper-sc"> <view class="flex-wrap flex-row items"> <block wx:for="{{item}}" wx:key="index"> <image src="https://www.yuucn.com/wp-content/uploads/2023/04/1682149599-47bec120528c89e.jpg" mode="aspectFill" class="item-img" /> </block> </view> </scroll-view> </swiper-item> </swiper> </scroll-view> page { background-color: #ffa500; height: 100%; } .head { height: 90rpx; color: #333; font-size: 30rpx; padding-left: 30rpx; font-weight: bold; padding-bottom: 10rpx; box-sizing: border-box; } .head-title { position: relative; display: inline-block; height: 100%; } .head-title::after { content: ; position: absolute; z-index: 99; width: 15px; height: 15px; margin-left: -15rpx; border-top: 3px solid #333; border-right: 3px solid #333; border-top-right-radius: 100%; transform: rotate(-225deg); left: 50%; bottom: 3px; } .container { width: 100%; height: calc(100% - 90rpx); background-color: #fff; overflow: hidden; border-radius: 30rpx 30rpx 0 0; } .container-head { width: 100%; height: 110rpx; box-sizing: border-box; padding: 10rpx 20rpx; } .container-head-sc { height: 50rpx; border-radius: 25rpx; background: #eeece4; color: #333; white-space: nowrap; } .container-head-sc .item { padding: 0 20rpx; min-width: 90rpx; text-align: center; line-height: 50rpx; font-size: 26rpx; display: inline-block; /* 引起高度塌陷 */ vertical-align: top; height: 50rpx; } .container-head-sc .active { color: #ffffff; font-weight: bold; background: orange; border-radius: 25rpx; } /* swiper默认高度为150px */ .container-swiper { height: calc(100% - 110rpx); } .container-swiper-sc { height: 100%; } .container-swiper-sc .items { padding: 0 2%; width: 100%; box-sizing: border-box; } .container-swiper-sc .items .item-img { width: 30vw; height: 30vw; margin-right: 2.8%; margin-bottom: 10rpx; flex-shrink: 0; } .container-swiper-sc .items .item-img:nth-child(3n+3) { margin-right: 0; } /* 隐藏scroll-view的滚动条 */ ::-webkit-scrollbar { width: 0; height: 0; color: transparent; } Page({ data: { currentTab: 0, sleft: "", //横向滚动条位置 list: [1, 2, 3, 4, 5, 6, 7, 22, 32],//测试列表 }, handleTabChange(e) { let { current } = e.target.dataset; if (this.data.currentTab == current || current === undefined) return; this.setData({ currentTab: current, }); }, handleSwiperChange(e) { this.setData({ currentTab: e.detail.current, }); this.getScrollLeft(); }, getScrollLeft() { const query = wx.createSelectorQuery(); query.selectAll(".item").boundingClientRect(); query.exec((res) => { let num = 0; for (let i = 0; i < this.data.currentTab; i++) { num += res[0][i].width; } this.setData({ sleft: Math.ceil(num), }); }); }, });4.写在最后🍒
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