iOS - pop a view controller by panning on the left edge, navigation bar disappears - ios

Question

So iOS 7 introduced this new feature that you can pop a view controller by panning on the left edge. Here is my problem: I have two view controllers, A and B, that are connected by a push segue. Both of the controllers have navigation bars (by embedding A in a navigation controller). The navigation bar in B will be hidden once the user enters B's scene, and can be shown if the user taps on the scene. If the user pans on the left edge of B while the navigation bar is hidden, the navigation bar in A will be hidden as well, which means that there is no way for the user to return further back from A. So is there a way to enforce A to always show the navigation bar regardless of B has hidden the bar or not? Or is there a easy way to prevent the pan gesture from taking effect? I read this post which suggested a way of preventing the pan, but I can't locate the property in storyboard.
EDIT: So I disabled the interactive pop gesture recognizer but that only solved half of the problem. The other half is that if I click the back button on the child view controller navigation bar when the navigation bar is disappearing, I am navigated back to the parent view controller without a navigation bar. I tried calling [self.navigationController setNavigationBarHidden:NO] in viewWillAppear and then viewDidLoad but it does not work. Is this some sort of bug in the SDK or am I missing something?
Here is the code for hiding the navigation bar in the child view controller
- (void)hideNavigationBar
{
if (self.navigationBarHidden == NO)
{
[UIView animateWithDuration:UINavigationControllerHideShowBarDuration animations:^{
self.navigationController.navigationBar.alpha = 0.0;
self.previewCollectionView.alpha = 0.0;
} completion:^(BOOL finished) {
self.navigationBarHidden = YES;
}];
}
}

Answer 1

Yes, you can enforce the navigation bar's appearance in the A viewController's -viewWillAppear method.
Also, since you cannot find the interactivePopGestureRecognizer property in the storyboard, you can use this line in the A viewController's -viewDidLoad method:
self.navigationController.interactivePopGestureRecognizer.enabled = NO;
EDIT:
In the viewWillAppear method, you will have to call:
[self.navigationController setNavigationBarHidden:NO];
self.navigationController.navigationBar.alpha = 1.0;

Answer 2

I see a couple problems with your situation:
You disable the interactive pop gesture and you hide the nav bar from view controller B. How is the user supposed to intuitively go back?
The animation that hides your navbar in B may be causing the issue. If it's anything longer than a split second, that animation may not complete in time before you hit the back button and -viewWillAppear fires on A.
Your code in B hides the navigation bar for the navigation controller. The navigation controller that holds view controller A is the same instance that holds view controller B. If you hide the navigation bar when B loads, then you go back to A (not sure how you're doing that without a back button or a edge pan gesture), it should still be hidden.
You probably want NOT disable the gesture (so the user can intuitively go back) and turn the navigation bar back on in view controller A's -viewWillAppear, to cover the case where you turned it off in B:
if (self.navigationBarHidden == NO)
{
self.navigationController.navigationBar.alpha = 1.0;
self.previewCollectionView.alpha = 1.0;
self.navigationBarHidden = NO;
}