How to implement custom bottom menu and TabBar in UniApp

UniApp is a cross-platform development framework based on Vue.js. It can be used to develop applications for multiple platforms such as iOS, Android, and small programs. In UniApp, it is a common requirement to implement customized bottom menu and TabBar. This article will introduce how to use UniApp to implement custom bottom menu and TabBar methods, and attach corresponding code examples.

First, we need to create a UniApp project. Open the UniApp development tool, choose to create a new project and fill in the project name, platform and other information, and then click the Create button to generate a basic UniApp project structure.

Next, we need to find the "pages" folder in the root directory of the project, enter the folder and create a folder named "tabBar". In this folder, we can create multiple page files related to TabBar. For example, we can create four page files such as "home", "mine", "cart", and "category".

In each page file, we need to add a <template> tag to define the structure of the page, as shown below:

<template>
  <view class="page">
    <!-- 页面内容 -->
  </view>
</template>

Then, we You need to add a tabBar option to the <script> tag of each page file to specify whether the page is displayed in the TabBar. For example, we can add the following code to the "home" page file:

<script>
  export default {
    // tabBar选项
    tabBar: true,
    
    // 页面数据
    
    // 页面生命周期
  }
</script>

In the above code, we set the tabBar option to true, indicating that the page will be displayed in the TabBar.

Next, we need to configure TabBar related information in the project's "pages.json" file. Open the file, find the "tabBar" field, and add the following code:

"tabBar": {
  "color": "#ccc",
  "selectedColor": "#000",
  "list": [
    {
      "pagePath": "pages/home/home",
      "text": "首页",
      "iconPath": "static/images/tabbar/home.png",
      "selectedIconPath": "static/images/tabbar/home_selected.png"
    },
    {
      "pagePath": "pages/category/category",
      "text": "分类",
      "iconPath": "static/images/tabbar/category.png",
      "selectedIconPath": "static/images/tabbar/category_selected.png"
    },
    {
      "pagePath": "pages/cart/cart",
      "text": "购物车",
      "iconPath": "static/images/tabbar/cart.png",
      "selectedIconPath": "static/images/tabbar/cart_selected.png"
    },
    {
      "pagePath": "pages/mine/mine",
      "text": "我的",
      "iconPath": "static/images/tabbar/mine.png",
      "selectedIconPath": "static/images/tabbar/mine_selected.png"
    }
  ]
}

In the above code, we used the "tabBar" field to configure the TabBar Information such as styles and page paths. Among them, the "color" field represents the color of the unselected TabBar icon and text, and the "selectedColor" field represents the color of the selected TabBar icon and text; "list"# The ## field is an array used to configure the information of each TabBar button, including page path, display text, unselected icon path and selected icon path, etc.

Next, we can add corresponding content to the page where the TabBar is located. For example, in the "home" page file, we can add the following code:

<template>
  <view class="page">
    <!-- 页面内容 -->
    <view class="content">
      <text>这是首页</text>
    </view>
  </view>
</template>

In the above code, we added a

tag to the structure of the page, and A text content is displayed in it.

Finally, we need to define the location of the TabBar in the "App.vue" file of the project. Open the file, find the

<template> tag, and add the following code in it:

<template>
  <!-- 页面结构 -->
  <view class="container">
    <!-- 页面内容 -->
    <router-view/>
    
    <!-- TabBar -->
    <tab-bar class="tabBar"/>
  </view>
</template>

In the above code, we used a file called

component to display TabBar. And control the display position of the TabBar by adding a style class named "tabBar".

Through the above steps, we can achieve the effect of customizing the bottom menu and TabBar.

To summarize, the method for UniApp to implement customized bottom menu and TabBar is as follows:

Create a UniApp project and enter the "pages" folder.
1. Create a "tabBar" folder under the "pages" folder, and create multiple TabBar-related page files under the folder.
2. In each page file, add a
3. <template> tag to define the structure of the page, and add a # in the <script> tag ##tabBar option to specify whether the page is displayed in the TabBar. Configure TabBar related information in the project's "pages.json" file, including style, page path, display text, icon path, etc.
4. Add corresponding content to the page where the TabBar is located.
5. Define the position of the TabBar in the "App.vue" file, and control the display position of the TabBar by adding a style class.
6. Through the above steps, we can easily customize the effects of the bottom menu and TabBar.

Hope the content of this article is helpful to you!

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