<template>
 <view class="tabbar-container">
  <view
   :style="{ color: currentIndex == index "
   v-for="(item, index) in tabbarList"
   :key="index"
   style="flex: 1"
   @click="switchTab(index)"
  >
   <view :class="'iconfont ' + item.icon" />
   <view class="title">{{ item.title }}</view>
  </view>
 </view>
</template>

mounted(){
 let dom = uni.createSelectorQuery().select('.tabbar-container')
  dom.boundingClientRect(e => {
   // tabbarHeight使用频次较高，就设为全局变量了
    getApp().globalData.tabbarHeight = e.height
  }).exec()
}

<style scoped lang="scss">
.iconfont {
 font-size: 18px;
}

.tabbar-container {
 display: flex;
 justify-content: space-evenly;
 text-align: center;
 padding: 10px 0;
 background-color: #fff;
 box-shadow: 0 -1.5px 3px #eee;
 z-index: 999;

 .title {
  font-size: 12px;
 }
}
</style>

<template>
 <view :style="'height: calc(100vh - ' + tabbarHeight + 'px)'">
  <tab-bar
   :currentIndex="currentIndex"
   class="tabbar-container"
   @getCurrentIndex="getCurrentIndex"
  />
  <swiper duration="0" disable-touch :current="currentIndex" style="height: 100%">
   <swiper-item>
    <scroll-view scroll-y style="height: 100%">
     <home />
    </scroll-view>
   </swiper-item>
   <swiper-item>
    <todo-page />
   </swiper-item>
   <swiper-item>
    <launch-task />
   </swiper-item>
   <swiper-item>
    <my-page />
   </swiper-item>
  </swiper>
 </view>
</template>

mounted() {
 this.tabbarHeight = getApp().globalData.tabbarHeight
},

getCurrentIndex(e) {
 this.currentIndex = e;
}