.swift

class ViewController: UIViewController
{
    override func viewDidLoad()
    {
        super.viewDidLoad()
        
        async {
            let jsonDownloader: JsonDownloader = JsonDownloader()
            let imageDownloader: ImageDownloader = ImageDownloader()
        
            let json: [String: AnyObject] = try! await(jsonDownloader.downloadContentsOfUrl("ourUrl.com"))
            
            let image: UIImage = try! await(imageDownloader.downloadImage(json["image_url"]))
            
            DispatchQueue.main.async { 
                let imageView = UIImageView(image: image)
                
                imageView.frame = CGRect(x: 0, y: 0, width: 300, height: 300)
                
                view.addSubview(imageView)
            }
        }
    }
}