What should I do if there is no tabbar on the uniapp page?

When using UniApp to develop mobile applications, we often encounter the need to add a bottom TabBar to the page. However, sometimes we find that the TabBar at the bottom is not displayed when using UniApp to develop the page. This is because in UniApp, the page does not contain TabBar by default and we need to add it manually.

So, how to add TabBar to UniApp page? Below we will introduce it step by step.

First, we need to add the TabBar component to the App.vue file. Open the App.vue file, find the code under the template tag, and add the following TabBar tag:

<tabbar>
  <tabbar-item></tabbar-item>
  <tabbar-item></tabbar-item>
  <tabbar-item></tabbar-item>
  <tabbar-item></tabbar-item>
</tabbar>

In the above code, we have added 4 TabBar menus, namely "Home", "Search", and "Shopping Cart" ” and “My”, and specify their corresponding page paths. Among them, each TabBar menu is represented by the tabbar-item tag, which contains three attributes: icon, title and path, which respectively represent the icon, title and path of the corresponding page of the menu.

Next, we need to add page paths to each page. Open the page where you want to add TabBar, such as index.vue on the homepage, find the export default code block under the script tag, and add the following code:

export default {
  onShow() {
    uni.setTabBarItem({
      index: 0,
      text: '首页',
      iconPath: '/static/tabBar/home.png',
      selectedIconPath: '/static/tabBar/home-active.png'
    })
  }
}

In the above code, we use the onShow life cycle function to set the current page TabBar menu. Among them, the setTabBarItem function is used to set the properties of a certain menu of TabBar, including the four properties of index, text, iconPath and selectedIconPath. Here we set the properties of the "Home" menu, including the menu's index, title, icon in the normal state and the icon in the selected state.

Finally, we need to define the path of each page in the pages.json configuration file. Open the pages.json configuration file and add the following code:

{
  "pages": [
    {
      "path": "pages/index/index",
      "style": {}
    },
    {
      "path": "pages/search/search",
      "style": {}
    },
    {
      "path": "pages/cart/cart",
      "style": {}
    },
    {
      "path": "pages/user/user",
      "style": {}
    }
  ],
  "tabBar": {
    "list": [
      {
        "pagePath": "pages/index/index",
        "text": "首页",
        "iconPath": "/static/tabBar/home.png",
        "selectedIconPath": "/static/tabBar/home-active.png"
      },
      {
        "pagePath": "pages/search/search",
        "text": "搜索",
        "iconPath": "/static/tabBar/search.png",
        "selectedIconPath": "/static/tabBar/search-active.png"
      },
      {
        "pagePath": "pages/cart/cart",
        "text": "购物车",
        "iconPath": "/static/tabBar/cart.png",
        "selectedIconPath": "/static/tabBar/cart-active.png",
        "badge": 0
      },
      {
        "pagePath": "pages/user/user",
        "text": "我的",
        "iconPath": "/static/tabBar/user.png",
        "selectedIconPath": "/static/tabBar/user-active.png"
      }
    ]
  }
}

In the above code, we define the paths of four pages, and define the properties of the TabBar menu in the tabBar property, including page path, menu text, Menu icon in normal state and menu icon in selected state.

At this point, the steps to add the TabBar menu are completed. We can recompile the UniApp application to see the effect. If everything goes well, you can see the TabBar menu displayed at the bottom of the page.

In general, UniApp does not include the TabBar menu by default and we need to add it manually. By adding the TabBar component to the App.vue file, adding the page path to each page, and defining the properties of the TabBar menu in the pages.json configuration file, you can easily implement the TabBar menu function.

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