Is it possible to modify or replace the display associated with the current view controller after it has been created?

Yes, in iOS it is possible to modify or replace the view associated with the current UIViewController after its creation. UIViewController contains a view property that can be modified or replaced during runtime.

For example, you can programmatically change the content of view or replace it with another UIView:

class MyViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()
        // Change background color
        self.view.backgroundColor = .white
    }

    func replaceView() {
        let newView = UIView(frame: self.view.frame)
        newView.backgroundColor = .blue
        self.view = newView
    }
}

However, keep in mind that replacing the controller's view can lead to unexpected consequences if other parts of the code reference the old view. It is usually better to modify the current view's content by adding or removing subviews rather than replacing it entirely.