product_list_tab.dart

class ProductListTab extends StatelessWidget {
 @override
 Widget build(BuildContext context) {
   return CupertinoPageScaffold(
     child: Consumer<AppStateModel>(
       builder: (context, child, model) {
         final products = model.getProducts();
         return CustomScrollView(
           semanticChildCount: products.length,
           slivers: <Widget>[
             CupertinoSliverNavigationBar(
               largeTitle: const Text('Cupertino Store'),
             ),
             SliverSafeArea(      // BEGINNING OF NEW CONTENT
               top: false,
               minimum: const EdgeInsets.only(top: 8),
               sliver: SliverList(
                 delegate: SliverChildBuilderDelegate(
                   (context, index) {
                     if (index < products.length) {
                       return ProductRowItem(
                         index: index,
                         product: products[index],
                         lastItem: index == products.length - 1,
                       );
                     }
                     return null;
                   },
                 ),
               ),
             )                  // END OF NEW CONTENT
           ],
         );
       },
     ),
   );
 }
}