mod: android/iOS配置文件、mainApp页面

lib/pages/main/view.dart

@@ -1,4 +1,7 @@
 import 'package:flutter/material.dart';
+import 'package:pilipala/pages/home/view.dart';
+import 'package:pilipala/pages/hot/view.dart';
+import 'package:pilipala/pages/mine/view.dart';
 
 class MainApp extends StatefulWidget {
   const MainApp({super.key});
@@ -8,11 +11,47 @@ class MainApp extends StatefulWidget {
 }
 
 class _MainAppState extends State<MainApp> {
+  int selectedIndex = 0;
+
+  void setIndex(int value) {
+    if (selectedIndex != value) {
+      selectedIndex = value;
+      setState(() {});
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return Scaffold(
-      appBar: AppBar(
-        title: const Text('main'),
+      body: IndexedStack(
+        index: selectedIndex,
+        children: const [
+          HomePage(),
+          HotPage(),
+          MinePage(),
+        ],
+      ),
+      bottomNavigationBar: NavigationBar(
+        elevation: 1,
+        destinations: const [
+          NavigationDestination(
+            icon: Icon(Icons.home_outlined),
+            selectedIcon: Icon(Icons.home),
+            label: "推荐",
+          ),
+          NavigationDestination(
+            icon: Icon(Icons.whatshot_outlined),
+            selectedIcon: Icon(Icons.whatshot_rounded),
+            label: "热门",
+          ),
+          NavigationDestination(
+            icon: Icon(Icons.person_outline),
+            label: "我的",
+            selectedIcon: Icon(Icons.person),
+          ),
+        ],
+        selectedIndex: selectedIndex,
+        onDestinationSelected: (value) => setIndex(value),
       ),
     );
   }