UINavigationController Interactive Pop Gesture Not Working?

Question

So I have a navigation controller in my built for iOS 7 app. The titleView is visible, as well as the back button and navigation bar its self. For some reason, the interac

Answer 1

My answer is based on Eneko's answer but uses only an extension on UINavigationController and works in Swift 5:

extension UINavigationController: UIGestureRecognizerDelegate {

    override open func viewDidLoad() {
        super.viewDidLoad()
        interactivePopGestureRecognizer?.delegate = self
    }

    public func gestureRecognizerShouldBegin(_ gestureRecognizer: UIGestureRecognizer) -> Bool {
        return viewControllers.count > 1
    }
}