opt: LoadingState (#1776)

lib/pages/fav/topic/controller.dart

@@ -38,15 +38,15 @@ class FavTopicController
   Future<LoadingState<FavTopicData>> customGetData() =>
       FavHttp.favTopic(page: page);
 
-  Future<void> onRemove(int index, int? id) async {
+  Future<void> onRemove(int index, int id) async {
     var res = await FavHttp.delFavTopic(id);
-    if (res['status']) {
+    if (res.isSuccess) {
       loadingState
         ..value.data!.removeAt(index)
         ..refresh();
       SmartDialog.showToast('已取消收藏');
     } else {
-      SmartDialog.showToast(res['msg']);
+      res.toast();
     }
   }
 }

lib/pages/fav/topic/view.dart

@@ -84,7 +84,7 @@ class _FavTopicPageState extends State<FavTopicPage>
                   void onLongPress() => showConfirmDialog(
                     context: context,
                     title: '确定取消收藏？',
-                    onConfirm: () => _controller.onRemove(index, item.id),
+                    onConfirm: () => _controller.onRemove(index, item.id!),
                   );
 
                   return Material(