Animated UIButton image array creation

gistfile1.txt

func setUpAnimatedFramesButton() {
        
        var imagesListArray :[UIImage] = []
        
        for position in 0...27
        {
            let strImageName : String = "icons8-cancel-\(position)"
            let image  = UIImage(named:strImageName)
            imagesListArray.append(image!)
        }
            animatedFramesButton.setImage(imagesListArray[0], for: .normal)
            animatedFramesButton.imageView?.animationImages = imagesListArray
            animatedFramesButton.imageView?.animationDuration = 1.0
            animatedFramesButton.imageView?.startAnimating()
        
    }