直接官方示例就行。
<view class="tabs">
<scroll-view ref="tabbar1" id="tab-bar" class="tab-bar" :scroll="false" :scroll-x="true" :show-scrollbar="false"
:scroll-into-view="scrollInto">
<view style="flex-direction: column;">
<view style="flex-direction: row;">
<view class="uni-tab-item" v-for="(tab,index) in tabList" :key="tab.id" :id="tab.id" :ref="'tabitem'+index"
:data-id="index" :data-current="index" @click="ontabtap">
<text class="uni-tab-item-title" :class="tabIndex==index ? 'uni-tab-item-title-active' : ''">{{tab.name}}</text>
</view>
</view>
<view class="scroll-view-indicator">
<view ref="underline" class="scroll-view-underline" :class="isTap ? 'scroll-view-animation':''"
:style="{left: indicatorLineLeft + 'px', width: indicatorLineWidth + 'px'}"></view>
</view>
</view>
</scroll-view>
<view class="tab-bar-line"></view>
<swiper class="tab-view" ref="swiper1" id="tab-bar-view" :current="tabIndex" :duration="300" @change="onswiperchange"
@transition="onswiperscroll" @animationfinish="animationfinish" @onAnimationEnd="animationfinish">
<swiper-item class="swiper-item" v-for="(page, index) in tabList" :key="index">
<!-- #ifndef MP-ALIPAY -->
<swiperPage class="swiper-page" :pid="page.pageid" ref="page"></swiperPage>
<!-- #endif -->
<!-- #ifdef MP-ALIPAY -->
<swiperPage class="swiper-page" :pid="page.pageid" :ref="'page' + index"></swiperPage>
<!-- #endif -->
</swiper-item>
</swiper>
</view>
</template>
<script>
// #ifdef APP-NVUE
const dom = weex.requireModule('dom');
// #endif
// 缓存每页最多
const MAX_CACHE_DATA = 100;
// 缓存页签数量
const MAX_CACHE_PAGE = 3;
const TAB_PRELOAD_OFFSET = 1;
import swiperPage from './swiper-page.nvue';
export default {
components: {
swiperPage
},
data() {
return {
tabList: [],
tabIndex: 0,
cacheTab: [],
scrollInto: "",
indicatorLineLeft: 0,
indicatorLineWidth: 0,
isTap: false
}
},
onLoad() {
for (var i = 0; i < 6; i++) {
this.tabList.push({
id: "tab" + i,
name: 'Tab ' + (i + 1),
pageid: i + 1
})
}
},
onReady() {
this._lastTabIndex = 0;
this.swiperWidth = 0;
this.tabbarWidth = 0;
this.tabListSize = {};
this._touchTabIndex = 0;
// #ifndef MP-ALIPAY
this.pageList = this.$refs.page;
// #endif
// #ifdef MP-ALIPAY
this.pageList = [];
for (var i = 0; i < this.tabList.length; i++) {
this.pageList.push(this.$refs['page' + i][0]);
}
// #endif
this.switchTab(this.tabIndex);
this.getTabbarItemsSize();
},
methods: {
ontabtap(e) {
let index = e.target.dataset.current || e.currentTarget.dataset.current;
// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
this.isTap = true;
var currentSize = this.tabListSize[index];
this.updateIndicator(currentSize.left, currentSize.width);
this._touchTabIndex = index;
// #endif
this.switchTab(index);
},
onswiperchange(e) {
// 注意：百度小程序会触发2次
// #ifndef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
let index = e.target.current || e.detail.current;
this.switchTab(index);
// #endif
},
onswiperscroll(e) {
if (this.isTap) {
return;
}
var offsetX = e.detail.dx;
var preloadIndex = this._lastTabIndex;
if (offsetX > TAB_PRELOAD_OFFSET) {
preloadIndex++;
} else if (offsetX < -TAB_PRELOAD_OFFSET) {
preloadIndex--;
}
if (preloadIndex === this._lastTabIndex || preloadIndex < 0 || preloadIndex > this.pageList.length - 1) {
return;
}
if (this.pageList[preloadIndex].dataList.length === 0) {
this.loadTabData(preloadIndex);
}
/// 计算 tabbar 底线
// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
var percentage = Math.abs(this.swiperWidth / offsetX);
var currentSize = this.tabListSize[this._lastTabIndex];
var preloadSize = this.tabListSize[preloadIndex];
var lineL = currentSize.left + (preloadSize.left - currentSize.left) / percentage;
var lineW = currentSize.width + (preloadSize.width - currentSize.width) / percentage;
this.updateIndicator(lineL, lineW);
// #endif
},
animationfinish(e) {
// #ifdef APP-PLUS || H5 || MP-WEIXIN || MP-QQ
let index = e.detail.current;
if (this._touchTabIndex === index) {
this.isTap = false;
}
this._lastTabIndex = index;
this.switchTab(index);
this.updateIndicator(this.tabListSize[index].left, this.tabListSize[index].width);
// #endif
},
getTabbarItemsSize() {
// #ifdef APP-NVUE
// 查询 tabbar 宽度
uni.createSelectorQuery().in(this).select('#tab-bar').boundingClientRect().exec(rect => {
this.tabbarWidth = rect[0].width;
});
// 查询 tabview 宽度
uni.createSelectorQuery().in(this).select('#tab-bar-view').boundingClientRect().exec(rect => {
this.swiperWidth = rect[0].width;
});
// 因 nvue 暂不支持 class 查询
var queryTabSize = uni.createSelectorQuery().in(this);
for (var i = 0; i < this.tabList.length; i++) {
queryTabSize.select('#' + this.tabList[i].id).boundingClientRect();
}
queryTabSize.exec(rects => {
console.log(JSON.stringify(rects));
rects.forEach((rect) => {
this.tabListSize[rect.dataset.id] = rect;
})
});
// #endif
// #ifdef MP-WEIXIN || H5 || MP-QQ
uni.createSelectorQuery().in(this).select('.tab-view').fields({
dataset: true,
size: true,
}, (res) => {
this.swiperWidth = res.width;
}).exec();
uni.createSelectorQuery().in(this).selectAll('.uni-tab-item').boundingClientRect((rects) => {
rects.forEach((rect) => {
this.tabListSize[rect.dataset.id] = rect;
})
}).exec();
// #endif
// #ifdef APP-NVUE || H5 || MP-WEIXIN || MP-QQ
setTimeout(() => {
this.updateIndicator(this.tabListSize[this.tabIndex].left, this.tabListSize[this.tabIndex].width);
}, 100)
// #endif
},
updateIndicator(left, width) {
this.indicatorLineLeft = left;
this.indicatorLineWidth = width;
},
switchTab(index) {
if (this.pageList[index].dataList.length === 0) {
this.loadTabData(index);
}
if (this.tabIndex === index) {
return;
}
// 缓存 tabId
if (this.pageList[this.tabIndex].dataList.length > MAX_CACHE_DATA) {
let isExist = this.cacheTab.indexOf(this.tabIndex);
if (isExist < 0) {
this.cacheTab.push(this.tabIndex);
}
}
this.tabIndex = index;
// #ifdef APP-NVUE
this.scrollTabTo(index);
// #endif
// #ifndef APP-NVUE
this.scrollInto = this.tabList[index].id;
// #endif
// 释放 tabId
if (this.cacheTab.length > MAX_CACHE_PAGE) {
let cacheIndex = this.cacheTab[0];
this.clearTabData(cacheIndex);
this.cacheTab.splice(0, 1);
}
},
scrollTabTo(index) {
const el = this.$refs['tabitem' + index][0];
let offset = 0;
// TODO fix ios offset
if (index > 0) {
offset = this.tabbarWidth / 2 - this.tabListSize[index].width / 2;
if (this.tabListSize[index].right < this.tabbarWidth / 2) {
offset = this.tabListSize[0].width;
}
}
dom.scrollToElement(el, {
offset: -offset
});
},
loadTabData(index) {
this.pageList[index].loadData();
},
clearTabData(index) {
this.pageList[index].clear();
}
}
}
</script>
<style>
/* #ifndef APP-PLUS */
page {
width: 100%;
min-height: 100%;
display: flex;
}
/* #endif */
.tabs {
flex: 1;
flex-direction: column;
overflow: hidden;
background-color: #ffffff;
/* #ifdef MP-ALIPAY || MP-BAIDU */
height: 100vh;
/* #endif */
}
.tab-bar {
width: 750rpx;
height: 84rpx;
flex-direction: row;
/* #ifndef APP-PLUS */
white-space: nowrap;
/* #endif */
}
/* #ifndef APP-NVUE */
.tab-bar ::-webkit-scrollbar {
display: none;
width: 0 !important;
height: 0 !important;
-webkit-appearance: none;
background: transparent;
}
/* #endif */
.scroll-view-indicator {
position: relative;
height: 2px;
background-color: transparent;
}
.scroll-view-underline {
position: absolute;
top: 0;
bottom: 0;
width: 0;
background-color: #007AFF;
}
.scroll-view-animation {
transition-duration: 0.2s;
transition-property: left;
}
.tab-bar-line {
height: 1rpx;
background-color: #cccccc;
}
.tab-view {
flex: 1;
}
.uni-tab-item {
/* #ifndef APP-PLUS */
display: inline-block;
/* #endif */
flex-wrap: nowrap;
padding-left: 25px;
padding-right: 25px;
}
.uni-tab-item-title {
color: #555;
font-size: 30rpx;
height: 80rpx;
line-height: 80rpx;
flex-wrap: nowrap;
/* #ifndef APP-PLUS */
white-space: nowrap;
/* #endif */
}
.uni-tab-item-title-active {
color: #007AFF;
}
.swiper-item {
flex: 1;
flex-direction: column;
}
.swiper-page {
flex: 1;
flex-direction: row;
position: absolute;
left: 0;
top: 0;
right: 0;
bottom: 0;
}
</style> 
