Instead of push segue how to replace view controller (or remove from navigation stack)?

Question

I have a small iPhone app, which uses a navigation controller to display 3 views (here fullscreen):

Answer 1

This worked for me in Swift 3:

class ReplaceSegue: UIStoryboardSegue {
    override func perform() {
        if let navVC = source.navigationController {
            navVC.pushViewController(destination, animated: true)
        } else {
            super.perform()
        }
    }
}