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.
<template> <view class="page"> <!-- 页面内容 --> <view class="content"> <text>这是首页</text> </view> </view> </template>
tag to the structure of the page, and A text content is displayed in it.
<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>
.
- Create a UniApp project and enter the "pages" folder.
- Create a "tabBar" folder under the "pages" folder, and create multiple TabBar-related page files under the folder.
- In each page file, add a
- <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.
- Add corresponding content to the page where the TabBar is located.
- Define the position of the TabBar in the "App.vue" file, and control the display position of the TabBar by adding a style class.
- 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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Generally speaking, uni-app is better when complex native functions are needed; MUI is better when simple or highly customized interfaces are needed. In addition, uni-app has: 1. Vue.js/JavaScript support; 2. Rich native components/API; 3. Good ecosystem. The disadvantages are: 1. Performance issues; 2. Difficulty in customizing the interface. MUI has: 1. Material Design support; 2. High flexibility; 3. Extensive component/theme library. The disadvantages are: 1. CSS dependency; 2. Does not provide native components; 3. Small ecosystem.

UniApp has many conveniences as a cross-platform development framework, but its shortcomings are also obvious: performance is limited by the hybrid development mode, resulting in poor opening speed, page rendering, and interactive response. The ecosystem is imperfect and there are few components and libraries in specific fields, which limits creativity and the realization of complex functions. Compatibility issues on different platforms are prone to style differences and inconsistent API support. The security mechanism of WebView is different from native applications, which may reduce application security. Application releases and updates that support multiple platforms at the same time require multiple compilations and packages, increasing development and maintenance costs.

uniapp development requires the following foundations: front-end technology (HTML, CSS, JavaScript) mobile development knowledge (iOS and Android platforms) Node.js other foundations (version control tools, IDE, mobile development simulator or real machine debugging experience)

UniApp is based on Vue.js, and Flutter is based on Dart. Both support cross-platform development. UniApp provides rich components and easy development, but its performance is limited by WebView; Flutter uses a native rendering engine, which has excellent performance but is more difficult to develop. UniApp has an active Chinese community, and Flutter has a large and global community. UniApp is suitable for scenarios with rapid development and low performance requirements; Flutter is suitable for complex applications with high customization and high performance.

When choosing between UniApp and native development, you should consider development cost, performance, user experience, and flexibility. The advantages of UniApp are cross-platform development, rapid iteration, easy learning and built-in plug-ins, while native development is superior in performance, stability, native experience and scalability. Weigh the pros and cons based on specific project needs. UniApp is suitable for beginners, and native development is suitable for complex applications that pursue high performance and seamless experience.

Recommended component library for uniapp to develop small programs: uni-ui: Officially produced by uni, it provides basic and business components. vant-weapp: Produced by Bytedance, with a simple and beautiful UI design. taro-ui: produced by JD.com and developed based on the Taro framework. fish-design: Produced by Baidu, using Material Design design style. naive-ui: Produced by Youzan, modern UI design, lightweight and easy to customize.
