动画效果美化

lib/utils/slide_up_page_route.dart

@@ -0,0 +1,28 @@
+import 'package:flutter/material.dart';
+
+/// 自定义页面过渡动画 — 向上滑入 + 淡入
+class SlideUpPageRoute extends PageRouteBuilder {
+  SlideUpPageRoute({required Widget page})
+      : super(
+          pageBuilder: (context, animation, secondaryAnimation) => page,
+          transitionsBuilder: (context, animation, secondaryAnimation, child) {
+            const begin = Offset(0.0, 0.08);
+            const end = Offset.zero;
+            final tween = Tween(begin: begin, end: end).chain(
+              CurveTween(curve: Curves.easeOutCubic),
+            );
+            final fadeTween = Tween<double>(begin: 0.0, end: 1.0).chain(
+              CurveTween(curve: const Interval(0.0, 0.3, curve: Curves.easeOut)),
+            );
+            return SlideTransition(
+              position: animation.drive(tween),
+              child: FadeTransition(
+                opacity: animation.drive(fadeTween),
+                child: child,
+              ),
+            );
+          },
+          transitionDuration: const Duration(milliseconds: 350),
+          reverseTransitionDuration: const Duration(milliseconds: 250),
+        );
+}