vue的TabBar组件

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vue的TabBar组件

TabBar组件的功能

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<template>
  <div class="tool-bar">
    <!-- tab 按钮，需要一个数据源，通过数据源去驱动视图  -->
    <div class="tool-bar-item" v-for="(item, index) in toolBarData" :key="index" @click="onChangeFragment(item, index)">
      <img class="tool-bar-item-img" :src="[index === selectIndex ? item.hIcon : item.nIcon]" alt="">
      <p class="tool-bar-item-name" :class="{'tool-bar-item-name-h' : index === selectIndex}">{{item.name}}</p>
    </div>
  </div>
</template>

<script>
/**
 * ToolBar的功能：
 * 1.永远位于页面的最底部
 * 2.点击 toolbar 按钮的时候，页面发生对应的切换
 * 3.按钮分 默认 和 选择 两个状态
 *
 * 能力和约束
 *  1.不具备的能力（回调）
 *  2.通过一个回调，告诉父组建，按钮点击的事件
 *  3.当按钮被选中的时候，应该切换按钮的状态
*/
export default {
  data: function () {
    return {
      toolBarData: [
        {
          nIcon: require('@img/xx.svg'),
          hIcon: require('@img/xx.svg'),
          name: 'xx',
          componentName: 'home'
        },
        {
          nIcon: require('@img/xx.svg'),
          hIcon: require('@img/xx.svg'),
          name: 'xx',
          componentName: 'my'
        }
      ],
      selectIndex: 0, // 选中的tab按钮
      isIphoneX: window.isIphoneX
    }
  },
  methods: {
    onChangeFragment (item, index) {
      this.selectIndex = index
      this.$emit('onChangeFragment', item.componentName)
    }
  }
}
</script>

<style lang="scss" scoped>
@import '@css/style.scss';
.tool-bar {
  width: 100%;
  height: 46px;
  display: flex;
  justify-content: space-around;
  background-color: white;
  box-shadow: 0 0 16px 0 rgba(0,0,0,0.2);
  border-top: 1px solid $lineColor;
  font-size: 16px;
  &-item {
    text-align: center;
    padding: px2rem(4) 12px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    &-img {
      width: px2rem(22);
      height: px2rem(22);
    }
    &-name {
      font-size: $minInfoSize;
      margin-top: px2rem(4);
      &-h {
        color: $mainColor;
      }
    }
  }
}
</style>
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Main.vue 

<template>
  <div class="main">
    <!-- 失活的组件将会被缓存！ -->
    <keep-alive>
      <component :is="currentComponent"></component>
    </keep-alive>
    <ToolBar @onChangeFragment="onChangeFragment" />
  </div>
</template>

<script>
import ToolBar from '@c/ToolBar'
export default {
  data () {
    return {
      currentComponent: 'home'
    }
  },
  components: {
    ToolBar,
    // 异步组件引入方式，异步组件：只有在需要展示这个组件的时候，才会把组件进行渲染
    home: () => import('@c/Home'),
    shopping: () => import('@c/Shopping'),
    my: () => import('@c/My')
  },
  methods: {
    onChangeFragment (componentName) {
      this.currentComponent = componentName
    }
  }
}
</script>

<style lang="scss" scoped>
.main {
  width: 100%;
  height: 100%;
  display: flex;
  flex-direction: column;
}
</style>
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<template>
  <div class="home">Home</div>
</template>

<script>
export default {

}
</script>

<style lang="scss" scoped>
.home {
  width: 100%;
  height: 100%;
}
</style>