let images = self.storyboard?.instantiateViewController(withIdentifier:"Collection") as! UICollectionViewController
            self.navigationController?.pushViewController(images, animated: true)

class ViewController: UIViewController {

  @IBOutlet weak var imageView: UIImageView!

  override func viewDidLoad() {
    super.viewDidLoad()
  }

  override func prepare(for segue: UIStoryboardSegue, sender: Any?) {

    // showDetail Segue
    if segue.identifier == "showDetail" {
      // Sending the image to DetailViewController
      // Before appears in the screen.
      let detailViewController = segue.destination as! DetailViewController
      detailViewController.image = sender as? UIImage
    }

  }

  @IBAction func loginButton(_ sender: AnyObject) {

    // Go to another view controller
    performSegue(withIdentifier: "showDetail", sender: imageView.image)

  }

}

class DetailViewController: UIViewController {
  @IBOutlet weak var imageView: UIImageView!
  var image: UIImage?

  override func viewDidLoad() {
    super.viewDidLoad()

    if let imageSent = image {
      imageView.image = imageSent
    }
  }
}

let vc = self.storyboard?.instantiateViewController(withIdentifier: "UpdateFilesViewController")
self.navigationController?.present(vc!, animated: true, completion: nil)

self.navigationController?.pushViewController(images, animated: true)

let images = self.storyboard?.instantiateViewController(withIdentifier:"Collection") as! UICollectionViewController

self.present(images, animated: true, completion: nil)