本文实例为大家分享了Flutter底部导航栏的实现代码，供大家参考，具体内容如下

老规格，先看图：

程序主结构如下：

1.在程序主入口文件main.dart添加如下代码

import 'package:flutter/material.dart';import 'bottom_navigation.dart';void main() => runApp(MyApp());class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( title: 'Flutter Demo', theme: ThemeData.light(), home: BottomNavigationWidget(), ); }}

2.创建4个界面，home_page.dart、constant_page.dart、find_page.dart、my_page.dart

home_page.dart

import 'package:flutter/material.dart';class HomePage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('HomePage'),), body: Center( child: Text('这是首页'), ), ); }}

constant_page.dart

import 'package:flutter/material.dart';class ConstantPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('ConstantPage'),), body: Center( child: Text('这是联系人'), ), ); }}

find_page.dart

import 'package:flutter/material.dart';class FindPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('FindPage'),), body: Center( child: Text('这是发现'), ), ); }}

my_page.dart

import 'package:flutter/material.dart';class MyPage extends StatelessWidget { @override Widget build(BuildContext context) { return Scaffold( appBar: AppBar(title: Text('MyPage'),), body: Center( child: Text('这是我的'), ), ); }}

3.创建动态组件BottomNavigationWidget，新建bottom_navigation.dart

import 'package:flutter/material.dart';import 'pages/home_page.dart';import 'pages/constant_page.dart';import 'pages/find_page.dart';import 'pages/my_page.dart';class BottomNavigationWidget extends StatefulWidget { @override _BottomNavigationWidgetState createState() => new _BottomNavigationWidgetState();}class _BottomNavigationWidgetState extends State<BottomNavigationWidget> { final List<Widget> list = List(); int _currentIndex = 0; @override void initState() { list ..add(HomePage()) ..add(ConstantPage()) ..add(FindPage()) ..add(MyPage()); super.initState(); } @override Widget build(BuildContext context) { return Scaffold( body: list[_currentIndex], bottomNavigationBar: BottomNavigationBar( currentIndex: _currentIndex, onTap: (int index){ setState(() { _currentIndex = index; }); }, type: BottomNavigationBarType.fixed, items: [ BottomNavigationBarItem( icon: Icon(Icons.home,color: Colors.blue,), title: Text('首页',style: TextStyle(color: Colors.blue)) ), BottomNavigationBarItem( icon: Icon(Icons.contacts,color: Colors.blue,), title: Text('联系',style: TextStyle(color: Colors.blue)) ), BottomNavigationBarItem( icon: Icon(Icons.find_in_page,color: Colors.blue,), title: Text('发现',style: TextStyle(color: Colors.blue)) ), BottomNavigationBarItem( icon: Icon(Icons.menu,color: Colors.blue,), title: Text('我的',style: TextStyle(color: Colors.blue)) ), ] ), ); }}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。