Image doesn't display

[andreimarkoff]

Hi!I am working with tmdb API and want to display some movies on a cards depending on a query(For now I try to display only one card in order to test it first).I followed the instructions on main page of this repo, and everything is fine description is displayed and I can swipe this View, except image doesn't display.Please help me if you can.Thank you!
`
import UIKit
import Shuffle_iOS

class ResultViewController: UIViewController {
let cardStack = SwipeCardStack()

var cardImages = [UIImage](){didSet {
    DispatchQueue.main.async {
        self.cardStack.reloadData()
    }
}}



var name:String = ""
var releaseDate:String = ""
var popularity:Double = 0.0
var voteAverage:Double = 0.0
var budget:Int = 0
var revenue:Int = 0
var overview:String = ""

var url:URL!
var image:UIImage!




@IBOutlet weak var titleLabel: UILabel!
@IBOutlet weak var ratingLabel: UILabel!
@IBOutlet weak var budgetLabel: UILabel!
@IBOutlet weak var overviewLabel: UILabel!

override func viewDidLoad() {

    super.viewDidLoad()
    view.addSubview(cardStack)
    cardStack.frame = view.safeAreaLayoutGuide.layoutFrame
    cardStack.dataSource = self
}
override func viewWillAppear(_ animated: Bool) {
    if url != nil{
        downloadImage(from: url)
        DispatchQueue.main.async {
            self.titleLabel.text = self.name + "(" + self.releaseDate + ")"
            self.ratingLabel.text = String(self.popularity) + "     " + String(self.voteAverage)
            self.budgetLabel.text = "Budget: " + String(self.budget) + "Revenue: " + String(self.revenue)
            self.overviewLabel.text = self.overview
        }
    }
}

}
extension ResultViewController{
func getData(from url: URL, completion: @escaping (Data?, URLResponse?, Error?) -> ()) {
URLSession.shared.dataTask(with: url, completionHandler: completion).resume()
}
func downloadImage(from url: URL) {
getData(from: url) { data, response, error in
guard let data = data, error == nil else { return }
DispatchQueue.main.async() {
let image = UIImage(data: data)
if image != nil{
self.cardImages.append(image!)
print(self.cardImages)

            }
        }
    }
}

}
extension ResultViewController:SwipeCardStackDataSource{
func cardStack(_ cardStack: SwipeCardStack, cardForIndexAt index: Int) -> SwipeCard {
return card(fromImage: cardImages[index])
}

func numberOfCards(in cardStack: SwipeCardStack) -> Int {
    cardImages.count
}
func card(fromImage image: UIImage) -> SwipeCard {
  let card = SwipeCard()
  card.swipeDirections = [.left, .right]
  card.content = UIImageView(image: image)
  
  let leftOverlay = UIView()
  leftOverlay.backgroundColor = .green
  
  let rightOverlay = UIView()
  rightOverlay.backgroundColor = .red
  
  card.setOverlays([.left: leftOverlay, .right: rightOverlay])
  
  return card
}

}
`