需要帮助！ 如何使用 flutter 中的 static 访问无法访问此实例成员“getCategoryModelList”

Question

 class AppProvider with ChangeNotifier { static List<CategoryModel> categoryModelList = []; late CategoryModel categoryModel; Future<void> getCategoryProduct() async { List<CategoryModel> list = []; QuerySnapshot querySnapshot = await FirebaseFirestore.instance.collection("homecategory").get(); querySnapshot.docs.forEach( (categoryData) { categoryModel = CategoryModel( image: categoryData["image"], name: categoryData["name"], ); list.add(categoryModel); }, ); categoryModelList = list; notifyListeners(); } List<CategoryModel> get getCategoryModelList { return categoryModelList; } }

Widget _buildBottomPart() { return Container( width: double.infinity, height: 240, child: Column( mainAxisAlignment: MainAxisAlignment.end, crossAxisAlignment: CrossAxisAlignment.start, children: [ Container( height: 240, child: ListView.builder( scrollDirection: Axis.horizontal, itemCount: AppProvider.getCategoryModelList.length, itemBuilder: (ctx, index) => _buildSingleCategory( name: AppProvider.getCategoryModelList[index].name, image: AppProvider.getCategoryModelList[index].image, ), ), ), ], ), ); }

Answer 1

either create an instance from AppProvider like this:

AppProvider appProvider = AppProvider();
appProvider.getCategoryModelList.length

or define ' getCategoryModelList ' as static List