func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
     let dn = arrData[indexPath.row]
     cell.fav_btn.tag = dn.id
     cell.fav_btn.addTarget(self, action: #selector(checkMarkButtonClicked(sender:)), for: .touchUpInside)
}

@objc func checkMarkButtonClicked ( sender: UIButton) {
        print("button presed")
        let buttonTag = sender.tag
        print(buttonTag)

}

class CustomTableViewCell: UITableViewCell {
    var buttonAction: (() -> Void)?
}

fav_btn.addTarget(self, action: #selector(checkMarkButtonClicked(sender:)), for: .touchUpInside)

@objc func checkMarkButtonClicked (sender: UIButton) {
     if let myAction = buttonAction {
        myAction()
     }

}

func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

   // ваша логика

   cell.buttonAction = { [weak self] in
        self?.someMethod()
   }
}