title: How can i set a new Root viewController in Swift 4?
body: <p>I am a rookie in Swift. I have a initial viewController within a navigationController. Inside that is a tableView. When i click on the add button item in the NavigationBar a new viewController is present modaly. Now i click a another  button in the presented Vc and the presented Vc is dismiss. The root Vc is present now. But i will show a new root vc. I will set a new root Vc when dismiss the second Vc. </p>
  
  <p>Can i set a new root Vc programmaticly when i dismiss a second vc?</p>