Changes in Xcode 9 not reflecting in mainStoryboard, however, same changes are reflecting in simulator (how ? this is driving me nuts) : I am new to app development and there are good chances this is very bad question but this is really deriving me crazy. 

I am trying to set the dimensions of an image via writing code but when I am trying to run the code it is working fine and showing the changes in simultor but "NOT IN MainStoryboard" ... why this may be happening ? 

    
    Import UIKit

    class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
       
        
        let imageView = UIImageView(frame: CGRect(x: 100, y: 500, width: 258, height: 64)); // set as you want
        let image = UIImage(named: "signInLogo.png");
        imageView.image = image;
        self.view.addSubview(imageView);
        
        
       }

       override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
       [enter image description here][1]}
    }


   


  [1]: https://i.stack.imgur.com/rN7zw.jpg