发生异常。 LateError（LateInitializationError：字段“注释”尚未初始化。）

Question

class search extends StatefulWidget { const search({Key? key}): super(key: key);

@override State createState() => _searchState(); }

class _searchState extends State { String query = '';

late List notes;

@override Widget build(BuildContext context) => Scaffold( appBar: AppBar( title: Text("sdfs"), centerTitle: true, ), body: Column( children: [ buildSearch(), Expanded( child: StaggeredGridView.countBuilder( itemCount: notes.length, staggeredTileBuilder: (index) => StaggeredTile.fit(2), crossAxisCount: 4, itemBuilder: (context, index) { final note = notes[index];

              return GestureDetector(
                onTap: () async {
                  await Navigator.of(context).push(MaterialPageRoute(
                    builder: (context) => NoteDetailPage(noteId: note.id!),
                  ));
                },
                child: NoteCardWidget(note: note, index: index),
              );
            },
          ),
        ),
      ],
    ),
  );

Answer 1

you have made the List notes late but seems you have used it without initializing it. You need to initialize it in initState , like this one-

  @override
  void initState() {
    super.initState();

    notes = [];
  }