Initial Flutter project structure、

lib/app/app.dart

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+// import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:patbond_flutter/features/main/main_shell_page.dart';
+
+class App extends StatelessWidget{
+  const App({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Patbond',
+      debugShowCheckedModeBanner: false,
+      home: const MainShellPage(),
+    );
+  }
+}

lib/features/home/home_page.dart

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+// import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+
+class HomePage extends StatelessWidget{
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return const Center(
+      child: Text("Patbond"),
+    );
+  }
+}

lib/features/main/main_shell_page.dart

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+import 'package:flutter/material.dart';
+import 'package:patbond_flutter/features/home/home_page.dart';
+
+class MainShellPage extends StatefulWidget {
+  const MainShellPage({super.key});
+
+  @override
+  State<MainShellPage> createState() => _MainShellPageState();
+}
+
+class _MainShellPageState extends State<MainShellPage> {
+  int currentIndex = 0;
+
+  final pages = const [
+    HomePage(),
+    Center(child: Text('发现')),
+    Center(child: Text('发布')),
+    Center(child: Text('消息')),
+    Center(child: Text('我的')),
+  ];
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      body: pages[currentIndex],
+      bottomNavigationBar: NavigationBarTheme(
+        data: NavigationBarThemeData(
+          backgroundColor: Colors.white,
+          indicatorColor: Colors.red.shade50,
+          labelTextStyle: WidgetStateProperty.all(
+            const TextStyle(
+              fontSize: 12,
+              fontWeight: FontWeight.w600,
+            ),
+          ),
+          iconTheme: WidgetStateProperty.resolveWith((states) {
+            if (states.contains(WidgetState.selected)) {
+              return const IconThemeData(color: Colors.red);
+            }
+            return const IconThemeData(color: Colors.grey);
+          }),
+        ),
+        child: NavigationBar(
+          selectedIndex: currentIndex,
+          onDestinationSelected: (index) {
+            setState(() {
+              currentIndex = index;
+            });
+          },
+          destinations: const [
+            NavigationDestination(
+              icon: Icon(Icons.home_outlined),
+              selectedIcon: Icon(Icons.home),
+              label: '首页',
+            ),
+            NavigationDestination(
+              icon: Icon(Icons.explore_outlined),
+              selectedIcon: Icon(Icons.explore),
+              label: '发现',
+            ),
+            NavigationDestination(
+              icon: Icon(Icons.add_circle_outline),
+              selectedIcon: Icon(Icons.add_circle),
+              label: '发布',
+            ),
+            NavigationDestination(
+              icon: Icon(Icons.notifications_outlined),
+              selectedIcon: Icon(Icons.notifications),
+              label: '消息',
+            ),
+            NavigationDestination(
+              icon: Icon(Icons.person_outline),
+              selectedIcon: Icon(Icons.person),
+              label: '我的',
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

lib/main.dart

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+import 'package:flutter/material.dart';
+import 'app/app.dart';
+
+void main() {
+  runApp(const App());
+}