flutter3导航页示例

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import 'package:flutter/material.dart';   void main() {   runApp(const GoWaterMyApp()); }   class GoWaterMyApp extends StatelessWidget {   const GoWaterMyApp({super.key});   @override   Widget build(BuildContext context) {     return MaterialApp(       title: 'GoWater',       theme: ThemeData(         colorScheme: ColorScheme.fromSeed(             seedColor: Colors.lightBlue),         useMaterial3: true,       ),       home: const MyHomePage(title: '桶装水自动配送系统'),     );   } }   class MyHomePage extends StatefulWidget {   const MyHomePage({super.key, required this.title});     final String title;     @override   State<MyHomePage> createState() => _MyHomePageState(); }   class _MyHomePageState extends State<MyHomePage> {   late int _selectedIndex = 0;   @override   Widget build(BuildContext context) {     return Scaffold(       appBar: AppBar(         backgroundColor: Theme.of(context).colorScheme.inversePrimary,         title: Text(widget.title),       ),       body: SafeArea(         child: Container(),       ), //导航开始       bottomNavigationBar: BottomNavigationBar(         selectedItemColor: Colors.lightBlue,         currentIndex: _selectedIndex,         onTap: (index) =>             setState(() {               _selectedIndex = index;             }),         items: const [           BottomNavigationBarItem(             icon: Icon(Icons.list),             label: '历史',           ),           BottomNavigationBarItem(             icon: Icon(Icons.widgets),             label: '订水',           ),           BottomNavigationBarItem(             icon: Icon(Icons.settings),             label: '自己',           ),         ],       ), //导航结束     );   } }