Enable swipe back when navigation bar is hidden

SwipeBackGestureViewController.swift

class SwipeBackGestureViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        navigationController?.hidesBarsOnSwipe = true
        navigationController?.interactivePopGestureRecognizer?.delegate = self
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        navigationController?.interactivePopGestureRecognizer?.isEnabled = navigationController?.viewControllers.count ?? 0 > 1
    }

    override func viewDidDisappear(_ animated: Bool) {
        super.viewDidDisappear(animated)

        navigationController?.interactivePopGestureRecognizer?.delegate = nil
    }
}

extension SwipeBackGestureViewController: UIGestureRecognizerDelegate {

}