How to use static constructor in stateful widget flutter?

I want to make a clickable iconButton with a different boolean value init.

get the IconButton code :

Row(
 children: [
  CheckIcon(isCheck: true,),
  CheckIcon(isCheck: false,),
  CheckIcon(isCheck: true,),
 ],
),

IconButton Code :

import 'package:flutter/material.dart';

class CheckIcon extends StatefulWidget {
  static bool? isCheck;

  //the error is hire
  const CheckIcon({
    Key? key,
    // I can't initialize the static boolean in constructor
  }) : super(key: key);

  @override
  State<CheckIcon> createState() => _CheckIconState();
}

class _CheckIconState extends State<CheckIcon> {
  @override
  Widget build(BuildContext context) {
    return IconButton(
      splashRadius: 18.0,
      icon: Icon(
        CheckIcon.isCheck!
            ? Icons.check_circle_rounded
            : Icons.check_circle_outline_rounded,
        color: Colors.lightBlue,
        size: 20,
      ),
      onPressed: () {
        setState(() {
          CheckIcon.isCheck = !CheckIcon.isCheck!;
        });
      },
    );
  }
}

How to initialize the static boolean in the constructor stateful widget in flutter?

I hope you have the idea to share, cheers... thanks

Why use static? Static field is shared across all instances, you won't have different states.

Instead use State field and change it in setState method:

class CheckIcon extends StatefulWidget {
  final bool isCheck;

  const CheckIcon({
    Key? key,
    required this.isCheck, // here we set first value
  }) : super(key: key);

  @override
  State<CheckIcon> createState() => _CheckIconState();
}

class _CheckIconState extends State<CheckIcon> {
  late bool checked = widget.isCheck; // here we set first value and then change it in setState

  @override
  Widget build(BuildContext context) {
    return IconButton(
      splashRadius: 18.0,
      icon: Icon(
        checked
            ? Icons.check_circle_rounded
            : Icons.check_circle_outline_rounded,
        color: Colors.lightBlue,
        size: 20,
      ),
      onPressed: () {
        setState(() {
          checked = !checked;
        });
      },
    );
  }
}