mod: homePage开发、mainPage优化

lib/pages/home/widgets/app_bar.dart

@@ -0,0 +1,58 @@
+import 'dart:io';
+import 'package:flutter/material.dart';
+
+class HomeAppBar extends StatelessWidget {
+  const HomeAppBar({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return SliverAppBar(
+      // forceElevated: true,
+      scrolledUnderElevation: 0,
+      toolbarHeight: Platform.isAndroid
+          ? (MediaQuery.of(context).padding.top + 6)
+          : Platform.isIOS
+              ? MediaQuery.of(context).padding.top - 2
+              : kToolbarHeight,
+      expandedHeight: kToolbarHeight + MediaQuery.of(context).padding.top,
+      automaticallyImplyLeading: false,
+      pinned: true,
+      floating: true,
+      primary: false,
+      flexibleSpace: LayoutBuilder(
+        builder: (context, constraints) {
+          return FlexibleSpaceBar(
+            background: Column(
+              children: [
+                AppBar(
+                  centerTitle: false,
+                  title: const Text(
+                    'PiLiPaLa',
+                    style: TextStyle(
+                      fontSize: 18,
+                      fontWeight: FontWeight.bold,
+                      letterSpacing: 1,
+                    ),
+                  ),
+                  actions: [
+                    IconButton(
+                      onPressed: () {},
+                      icon: const Icon(Icons.notifications_none_rounded),
+                    ),
+                    IconButton(
+                      onPressed: () {},
+                      icon: const Icon(Icons.search_rounded),
+                    ),
+                    const SizedBox(width: 10)
+                  ],
+                  elevation: 0,
+                  scrolledUnderElevation: 0,
+                ),
+              ],
+            ),
+          );
+        },
+      ),
+    );
+  }
+}