Swift - save tableviewcells with checked buttons on "Apply" button click

I display drinks' categories in tableview. In each cell displayed category name and there is a checkbox button. On button click checkbox image appear/disappear.

On the "Apply" button click I want to remember buttons in which cells are checked. Maybe get cell's category name and store it in an array.

Please advice how can I save all checked cells (ones with the "checked-image") on the "Apply" button click?

CheckBox class:

class CheckBox: UIButton {
    
        let checkedImage = UIImage(named: "checked-image")! as UIImage
        let uncheckedImage = UIImage(named: "unchecked-image")! as UIImage
        
        var isChecked: Bool = true {
            didSet {
                if isChecked == true {
                    self.setImage(checkedImage, for: .normal)
                } else {
                    self.setImage(uncheckedImage, for: .normal)
                }
            }
        }
        
        override func awakeFromNib() {
            self.addTarget(self, action: #selector(buttonClicked), for: .touchUpInside)
            self.isChecked = true
        }
        
        @objc func buttonClicked(sender: UIButton) {
            if sender == self {
                if isChecked == false {
                    isChecked = true
                } else {
                    isChecked = false
                }
            }
        }
    }

TableView:

class FilterViewController: UIViewController {

    var categories = [Category]()
    
    @IBOutlet weak var tableView: UITableView!
    @IBOutlet weak var applyButton: UIButton!
    
    override func viewDidLoad() {
        super.viewDidLoad()
        getCategories()
    }
    
    @IBAction func applyButtonClicked(_ sender: UIButton) {
        print("Filter applied") 
        // save checked buttons 
    }
    
    func getCategories() {
        let url = URL(string: "https://www.thecocktaildb.com/api/json/v1/1/list.php?c=list")
        
        URLSession.shared.dataTask(with: url!) { (data, response, error) in
            
            if error == nil {
                do {
                    self.categories = try JSONDecoder().decode(Categories.self, from: data!).drinks
                    
                    DispatchQueue.main.async {
                        self.tableView.reloadData()
                    }
                } catch {
                    print(error)
                }
            }
        }.resume()
    }

}

extension FilterViewController: UITableViewDelegate, UITableViewDataSource {
    
    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        return categories.count
    }
    
    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        
        let cell = tableView.dequeueReusableCell(withIdentifier: "categoryCell", for: indexPath) as! CategoryCell
        
        cell.categoryLabel.text = categories[indexPath.row].strCategory
        cell.styleButton()
        
        return cell
    }
}

My app: