Flutter - How to pass an object using the Navigator between two screens

pass_arguments.dart

//View #1 Pass any object as an argument in the Navigator as part of a Map:
  void _editItem(BuildContext context, int index, Box<ChecklistItem> box) {
    ChecklistItem _selectedItem = box.getAt(index) as ChecklistItem;
    Navigator.pushNamed(context, ChecklistEditScreen.id,
        arguments: {'item': _selectedItem});
  }

//View #2 Extract passed flutter arguments without passing them as parameters:

 Widget build(BuildContext context) {
    Map? args = ModalRoute.of(context)?.settings.arguments as Map?;
    if (args == null) return Container();
    ChecklistItem _item = args['item'] as ChecklistItem;
    return ChecklistEditContent(item: _item);
  }

//Usage:
onDoubleTap: () => _editItem(context, index, box),