Took a while to figure out how to have the DetailViewController show the selected image. The solution was quite simple, and took me a couple of hours and many 'print()' to figure out.

All I had to do was to add URL....

class Image: NSObject, NSCoding {
    var name: String
    var url: URL

    init(name: String, url: URL){
        self.name = name
        self.url = url
    }

    required init?(coder decoder: NSCoder){
        name = decoder.decodeObject(forKey: "name") as? String ?? ""
        url = decoder.decodeObject(forKey: "image") as? URL ?? URL(fileReferenceLiteralResourceName: "")
    }

    func encode(with coder: NSCoder) {
        coder.encode(name, forKey: "name")
        coder.encode(url, forKey: "url")
    }
}

    override func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
        if let dvc = storyboard?.instantiateViewController(identifier: "ImageView") as? DetailViewController {
            dvc.selectedImageURL = images[indexPath.row].url
            dvc.selectedImageName = images[indexPath.row].name
            navigationController?.pushViewController(dvc, animated: true)
        }
    }