UICollectionViewCell with UIButton checkbox - one checkbox selected at time

I have UICollectionView with UIButton as a checkbox and a label for first and last name. UIButton is inside a UICollectionViewCell. My problem is next:

I need one checkbox selected at time, if next was pressed, previous should be deselected. I tried to figure out UIButton's indexPath, unfortunetley with no luck. I will appreciate help.

Here is checkBox class:

let checkedImage = UIImage(named: "1x_checked")! as UIImage
let uncheckedImage = UIImage(named: "1x_unchecked")! as UIImage

// Bool property
var isChecked: Bool = false {
    didSet{
        if isChecked == true {
            self.setImage(checkedImage, for: .normal)
        } else {
            self.setImage(uncheckedImage, for: .normal)
        }
    }

override func awakeFromNib() {
    self.addTarget(self, action: #selector(buttonClicked(sender:)), for: .touchUpInside)
    self.isChecked = false

}

func buttonClicked(sender: UIButton) {
    if sender == self {
        isChecked = !isChecked