528 使用vue-router实现TabBar

---

TabBar实现思路

---

mian.js

import Vue from 'vue'
import App from './App'
import router from './router'

Vue.config.productionTip = false

new Vue({
  el: '#app',
  router,
  render: h => h(App)
})

---

App.vue

<template>
  <div id="app">
    <router-view></router-view>
    <main-tab-bar/>
  </div>
</template>

<script>
  import MainTabBar from './components/mainTabbar/MainTabBar'

  export default {
    name: 'App',
    components: {
      MainTabBar
    }
  }
</script>

<style>
  @import "./assets/css/base.css";
</style>

---

router.js

import Vue from 'vue'
import VueRouter from 'vue-router'

const Home = () => import('../views/home/Home')
const Category = () => import('../views/category/Category')
const Cart = () => import('../views/cart/Cart')
const Profile = () => import('../views/profile/Profile')

// 1.安装插件
Vue.use(VueRouter)

// 2.创建路由对象
const routes = [
  {
    path: '',
    redirect: '/home'
  },
  {
    path: '/home',
    component: Home
  },
  {
    path: '/category',
    component: Category
  },
  {
    path: '/cart',
    component: Cart
  },
  {
    path: '/profile',
    component: Profile
  }
]
const router = new VueRouter({
  routes,
  mode: 'history'
})

// 3.导出router
export default router

---

Home.vue

cart.vue等文件内容类似。

<template>
  <h2>首页</h2>
</template>

<script>
  export default {
    name: "Home",
  };
</script>

<style scoped>
</style>

---

MainTabBar.vue

<template>
  <tab-bar>
    <tab-bar-item path="/home" activeColor="hotpink">
      <img slot="item-icon" src="~assets/img/tabbar/home.svg" alt />
      <img slot="item-icon-active" src="~assets/img/tabbar/home_active.svg" alt />
      <div slot="item-text">首页</div>
    </tab-bar-item>
    <tab-bar-item path="/category" activeColor="hotpink">
      <img slot="item-icon" src="../../assets/img/tabbar/category.svg" alt />
      <img slot="item-icon-active" src="../../assets/img/tabbar/category_active.svg" alt />
      <div slot="item-text">分类</div>
    </tab-bar-item>
    <tab-bar-item path="/cart" activeColor="hotpink">
      <img slot="item-icon" src="../../assets/img/tabbar/shopcart.svg" alt />
      <img slot="item-icon-active" src="../../assets/img/tabbar/shopcart_active.svg" alt />
      <div slot="item-text">购物车</div>
    </tab-bar-item>
    <tab-bar-item path="/profile" activeColor="deepPink">
      <img slot="item-icon" src="../../assets/img/tabbar/profile.svg" alt />
      <img slot="item-icon-active" src="../../assets/img/tabbar/profile_active.svg" alt />
      <div slot="item-text">我的</div>
    </tab-bar-item>
  </tab-bar>
</template>

<script>
  import TabBar from "components/tabbar/TabBar";
  import TabBarItem from "components/tabbar/TabBarItem";

  export default {
    name: "MainTabBar",
    components: {
      TabBar,
      TabBarItem,
    },
  };
</script>

<style scoped>
</style>

---

TarBar.vue

<template>
  <div id="tab-bar">
    <slot></slot>
  </div>
</template>

<script>
  export default {
    name: "TabBar",
  };
</script>

<style scoped>
  #tab-bar {
    display: flex;
    background-color: #f6f6f6;

    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;

    box-shadow: 0 -1px 1px rgba(100, 100, 100, 0.2);
  }
</style>

---

TarBarItem.vue

<template>
  <!--所有的item都展示同一个图片, 同一个文字-->
  <div class="tab-bar-item" @click="itemClick">
    <div v-if="!isActive">
      <slot name="item-icon"></slot>
    </div>
    <div v-else>
      <slot name="item-icon-active"></slot>
    </div>
    <!-- 注意，样式这些不能直接加给 slot，因为slot会被替换，样式不会生效 -->
    <div :style="activeStyle">
      <slot name="item-text"></slot>
    </div>
  </div>
</template>

<script>
  export default {
    name: "TabBarItem",
    props: {
      path: String,
      activeColor: {
        type: String,
        default: "red",
      },
    },
    data() {
      return {
        // isActive: true
      };
    },
    computed: {
      isActive() {
        // /home -> item1(/home) = true
        // /home -> item1(/category) = false
        // /home -> item1(/cart) = true
        // /home -> item1(/profile) = true
        return this.$route.path.indexOf(this.path) !== -1;
      },
      activeStyle() {
        return this.isActive ? { color: this.activeColor } : {};
      },
    },
    methods: {
      itemClick() {
        this.$router.replace(this.path);
      },
    },
  };
</script>

<style scoped>
  .tab-bar-item {
    flex: 1;
    text-align: center;
    height: 49px;
    font-size: 14px;
  }

  .tab-bar-item img {
     24px;
    height: 24px;
    margin-top: 3px;
    vertical-align: middle;
    margin-bottom: 2px;
  }
</style>

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