Because you've changed the left bar button item, you're telling the navigation controller to stop managing the navigation-based back-actions that the user can take.
To fix it, you can tell the navigation controller to continue accepting those gestures on the current view controller by using:
self.navigationController.interactivePopGestureRecognizer.delegate = self;
Where self
if your view controller.
UIViewController
privately implements UIGestureRecognizerDelegate
, so you'll get a warning for this, but you can mitigate this by adding in the protocol conformance (<UIGestureRecognizerDelegate>
) to your header, or to a class extension.