当我启动我的应用程序时，我的 multiprovider 在颤振中出现问题：
'children != null && children.isNotEmpty': is not true
错误：
构建应用程序（脏）时抛出了以下断言：'package:nested/nested.dart'：断言失败：第 72 行 pos 16：'children != null && children.isNotEmpty'：不正确。相关的导致错误的小部件是 Application lib\main.dart:8 抛出异常时，这是堆栈 #2 new Nested package:nested/nested.dart:72
编码 ：
class Application extends StatelessWidget {
@override
Widget build(BuildContext context) {
return MultiProvider(
providers: providers,
child: _application(context),
);
}
Widget _application(BuildContext context) {
return MaterialApp(
title: 'Simple Rest API',
initialRoute: '/',
routes: {
'/': (context) => TeamsView(),
},
);
}
}
编辑 ：
我的直接投资：
List<SingleChildWidget> providers = [
...services,
...datas,
...repositories,
...usescases,
];
List<SingleChildWidget> services = [];
List<SingleChildWidget> datas = [];
List<SingleChildWidget> repositories = [];
List<SingleChildWidget> usescases = [];
class ViewModelBuilder {
static final _instances = {TeamsViewModel: () => TeamsViewModel()};
static ViewModel instanciate(Type type) {
return _instances[type]();
}
}
我的观点 ：
class TeamsView extends StatelessWidget {
@override
Widget build(BuildContext context) {
return View<TeamsViewModel>(
args: [],
builderView: (context, model, child) => _buildView(context, model),
);
}
}
Widget _buildView(BuildContext context, TeamsViewModel model) {
return Scaffold(
appBar: AppBar(
title: Text("Test"),
),
body: Center(
child: Text("Premier lancement"),
),
);
}
我的视图模型：
class TeamsViewModel extends ViewModel {
BuildContext _context;
void load(BuildContext context, List args) async {
_context = context;
setLifecycle(OnLoad());
setLifecycle(OnLoaded());
}
}
如果你想要其他代码，问我。