Not quite. In iOS land you have to more explicitly call
viewController.dismissViewControllerAnimated(true, completion: nil) if your view controller is a modal or one of the various dismissal methods on UINavigationController if your viewController was pushed on to the screen.
In Swift 3 this function is:
If you want to go back to the previous view controller
_ = navigationController?.popViewController(animated: true)
If you want to go back to the root view controller
_ = navigationController?.popToRootViewController(animated: true)