如果UILabel在A类中，并且将对其进行动画处理的didTapRightutton在B类中怎么办？

percentDiscountLabel在RandomizeDealsCollectionViewCell中。如果我点击didTapRightutton在另一个名为RandomizeDealsViewController

如何调用RandomizeDealsCollectionViewCell内部的函数来动画percentDiscountLabel？还有其他方法吗？

class RandomizeDealsCollectionViewCell: UICollectionViewCell {

@IBOutlet weak var percentDiscountLabel: UILabel!

    func animatePercentDiscountLabel(deals: String) {

        self.percentDiscountLabel.alpha = 0.6
        self.percentDiscountLabel.isHidden = false
        UIView.animate(withDuration: 0.6,delay: 0,options: .curveeaseinout,animations: {
            self.percentDiscountLabel.alpha = 1.0
        }) { (isCompleted) in
        }
        percentDiscountLabel.text = deals
    }

}


class RandomizeDealsViewController: UIViewController {

private var centeredCollectionViewFlowLayout: CenteredCollectionViewFlowLayout!

    @IBaction func didTapRightButton(_ sender: Any) {
        guard let indexCard = centeredCollectionViewFlowLayout.currentCenteredPage else { return }
        if (indexCard > 0) {
             centeredCollectionViewFlowLayout.scrollToPage(index: indexCard + 1,animated: true)
             // should call the animation function here

        }
    }


}