此代码在运行时崩溃并且不会呈现Listview或文本字段:returnScaffold(floatingActionButton:FloatingActionButton(child:Icon(Icons.add,color:Colors.white),onPressed:()async{contactsModel.entityBeingEdited=Contact();contactsModel.setStackIndex(1);}),body:Column(children:[Padding(padding:EdgeInsets.all(3.0),child:TextField(c

此代码在运行时崩溃并且不会呈现Listview或文本字段:returnScaffold(floatingActionButton:FloatingActionButton(child:Icon(Icons.add,color:Colors.white),onPressed:()async{contactsModel.entityBeingEdited=Contact();contactsModel.setStackIndex(1);}),body:Column(children:[Padding(padding:EdgeInsets.all(3.0),child:TextField(c