这里是我的代码**，错误是在fluttre更新为2之后。第13章请帮帮忙...error is on TaskCheckBox class onchanged methodand dart analys return The argument type 'Function' can't be assigned to the parameter type 'void Function（bool？）？'.**

class TaskTile extends StatefulWidget {
  @override
  _TaskTileState createState() => _TaskTileState();
}

class _TaskTileState extends State<TaskTile> {
  bool isChecked = false;

  @override
  Widget build(BuildContext context) {
    return ListTile(
      title: Text(
        'This is task.',
        style: TextStyle(
          decoration: isChecked ? TextDecoration.lineThrough : null,
        ),
      ),
      trailing: TaskCheckBox(checkboxState: isChecked,toggleCheckboxState: (bool checkboxState) {
        setState(() {
          isChecked = checkboxState;
        });
      }),
    );
  }
}

class TaskCheckBox extends StatelessWidget {
  final bool checkboxState;
  final Function toggleCheckboxState;

  TaskCheckBox({required this.checkboxState,required this.toggleCheckboxState});

  @override
  Widget build(BuildContext context) {
    return Checkbox(
      activeColor: Colors.lightBlueAccent,
      value: checkboxState,
      onChanged: toggleCheckboxState,
    );
  }
}