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这期内容当中小编将会给大家带来有关使用Flutter怎么实现底部导航栏,文章内容丰富且以专业的角度为大家分析和叙述,阅读完这篇文章希望大家可以有所收获。
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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{ final List 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)) ), ] ), ); } }
上述就是小编为大家分享的使用Flutter怎么实现底部导航栏了,如果刚好有类似的疑惑,不妨参照上述分析进行理解。如果想知道更多相关知识,欢迎关注创新互联行业资讯频道。