interactivePopGestureRecognizer corrupts navigation stack on root view controller

Question

In my UINavigationController I added custom back buttons with the side effect that it is not possible anymore to swipe left to right to pop the view controller and

Answer 1

Here is my solution for this. Swift 4.2

Implement UIGestureRecognizerDelegate and UINavigationControllerDelegate protocols. In my case I did this in an UITabBarController that would be also my root view controller.

Then, on viewDidLoad, do:

override func viewDidLoad() {
    super.viewDidLoad()

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

Then, add the delegate method for UINavigationControllerDelegate and check if it is the root view by counting the number of view on the navigation controller and disable it if it is or enable it if its not.

func navigationController(_ navigationController: UINavigationController, didShow viewController: UIViewController, animated: Bool) {
    let enable = self.navigationController?.viewControllers.count ?? 0 > 1
    self.navigationController?.interactivePopGestureRecognizer?.isEnabled = enable
}

Lastly, add the UIGestureRecognizerDelegate method

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldBeRequiredToFailBy otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

This should fix the problem without the necessity of manually enabling/disabling the gesture recogniser in every view of your project.