category page add keepalive mixin

lib/pages/express_packages/express_package_card.dart

@@ -97,26 +97,6 @@ class _ExpressPackageCardState extends State<ExpressPackageCard> {
                     ],
                   ),
                 ],
-          40.w.heightBox,
-          Row(
-            children: [
-              Spacer(),
-              MaterialButton(
-                shape: RoundedRectangleBorder(
-                    borderRadius: BorderRadius.circular(74.w)),
-                padding: EdgeInsets.symmetric(vertical: 8.w, horizontal: 24.w),
-                height: 50.w,
-                color: kPrimaryColor,
-                elevation: 0,
-                focusElevation: 0,
-                hoverElevation: 0,
-                disabledElevation: 0,
-                highlightElevation: 0,
-                onPressed: () {},
-                child: '确认领取'.text.size(24.sp).bold.color(ktextPrimary).make(),
-              )
-            ],
-          ),
         ],
       ),
     );

lib/ui/market/category/category_sub_view.dart

@@ -14,10 +14,12 @@ class CategorySubView extends StatefulWidget {
   _CategorySubViewState createState() => _CategorySubViewState();
 }
 
-class _CategorySubViewState extends State<CategorySubView> {
+class _CategorySubViewState extends State<CategorySubView>
+    with AutomaticKeepAliveClientMixin {
   List<MarketCategoryModel> _models = [];
   @override
   Widget build(BuildContext context) {
+    super.build(context);
     return EasyRefresh(
       header: MaterialHeader(),
       firstRefresh: true,
@@ -41,4 +43,7 @@ class _CategorySubViewState extends State<CategorySubView> {
       ),
     );
   }
+
+  @override
+  bool get wantKeepAlive => true;
 }