UINavigationContoller interactivePopGestureRecognizer inactive when navigation bar is hidden

Question

I have a view controller which is nested within a UINavigationController.

I have implemented the iOS 7 interactivePopGestureRecognizer to enable the user to gesture to pop a VC off the stack.

Within the VC i have a scrollview and whilst the user is not at the top of the scrollview I hide all the chrome (Navigation bar and status bar) to place focus on the content.

However with the navigation bar hidden, the interactivePopGestureRecognizer is not working.

I have tried enabling it after it has disappeared and verified it is not nil, however it still doesn't work.

Is there anything I am missing?

simonmaddox · Accepted Answer · 2016-05-20T09:54:46.190

38

Set your UIViewController subclass as the gestureRecognizer's delegate:

self.navigationController.interactivePopGestureRecognizer.delegate = self;

That's it!

edited May 20 '16 at 09:54

answered Nov 07 '13 at 10:58

simonmaddox

790
7
20

3

Thanks, in fact setting it to nil also works. I wonder if this is a bug? – Dan Nov 07 '13 at 11:03
17

There will be a bug if set self.navigationController.interactivePopGestureRecognizer.delegate to self or nil: Swipe from the edge of the screen, and tap something to push a view controller into the navigation controller quickly, then -- 1. The current view controller does not respond any touch event; 2. The new view contrller will not be shown; 3. Swipe from the edge of the screen again, the new view contrller will be shown; 4. Call popViewControllerAnimated: with the animated parameter set to NO (tap the custom back button), crash! – Míng Dec 16 '13 at 12:46
4

It looks like *just* setting the delegate isn't enough, see the crash report by @iwill. The workaround we found was to store the original delegate, e.g. in `viewDidLoad`, set yourself as the new one in `viewDidAppear:` and then reset it again to the original one in `viewDidDisappear:`. Kinda strange, but works. – Dennis Feb 03 '14 at 12:57
1

@Dennis having the same problem, but I tried your solution, doesn't seem to be working. – ninjaneer Mar 09 '14 at 20:44
4

I would not recommend this solution. It resulted in several bugs when presenting/popping view controllers. – Arie Litovsky Apr 01 '14 at 19:50
2

You should set it in viewDidAppear -(void)viewDidAppear:(BOOL)animated { self.navigationController.interactivePopGestureRecognizer.delegate = self; } – Alexi Akl May 04 '15 at 13:25
If you want to use further `interactivePop` in your navigation stack you have to save delegate object before changing `interactivePopGestureRecognizer.delegate` and restore the initial value when `UIViewController` disappears. – malex Sep 09 '15 at 15:59
@iwill did you ever figure out how to do this right? Im experiencing the same exact issue you mentioned/ – user7097242 Feb 23 '18 at 19:34
@ArieLitovsky what would you suggest for this then? – user7097242 Feb 23 '18 at 20:20
@user7097242 I posted an answer https://stackoverflow.com/a/20672693/456536 – Míng Feb 27 '18 at 02:35

score 16 · Answer 2 · answered Apr 24 '14 at 04:26

16

Simple solution

Just set the hidden property of the navigation bar not through navigation controller

Just use these two lines

self.navigationController.navigationBarHidden = NO;
self.navigationController.navigationBar.hidden = YES;

answered Apr 24 '14 at 04:26

Nagaraj

802
9
11

score 7 · Answer 3 · answered Feb 07 '14 at 10:54

I used this. self.navigationController.interactivePopGestureRecognizer.delegate = self;

also in my UINavigationController class to disable interactivePopGestureRecognizer during transitions.

- (void)pushViewController:(UIViewController *)viewController
              animated:(BOOL)animated
{
    if ([self respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        self.interactivePopGestureRecognizer.enabled = NO;
}

    [super pushViewController:viewController animated:animated];
}

- (void)navigationController:(UINavigationController *)navigationController
       didShowViewController:(UIViewController *)viewController
                    animated:(BOOL)animated
{
    if ([navigationController respondsToSelector:@selector(interactivePopGestureRecognizer)]) {
        // disable interactivePopGestureRecognizer in the rootViewController of navigationController
        if ([[navigationController.viewControllers firstObject] isEqual:viewController]) {
            navigationController.interactivePopGestureRecognizer.enabled = NO;
        } else {
            // enable interactivePopGestureRecognizer
            navigationController.interactivePopGestureRecognizer.enabled = YES;
        }
    }
}

the reason of disable interactivePopGestureRecognizer in rootViewController is:when swipe from edge in rootViewController and then tap something to push in next viewController, the UI won't accept any touches now.Press home button to put app in background , and then tap it to enter foreground...

score 3 · Answer 4 · edited Oct 12 '16 at 07:42

3

This doesn't seem to work for me. I followed Keithl's blog post. Neither did that work.

I ultimately settled with UISwipeGestureRecognizer. It seems to do what it says.

UISwipeGestureRecognizer *gestureRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(backButtonPressed:)];
[gestureRecognizer setDirection:(UISwipeGestureRecognizerDirectionRight)];
[self.navigationController.view addGestureRecognizer:gestureRecognizer];

edited Oct 12 '16 at 07:42

Peter B

22,460
5
32
69

answered Dec 27 '13 at 23:24

ThefunkyCoder

81
1
7

Did you mean to use `UIEdgePanGestureRecognizer`? – nekonari Jan 26 '17 at 19:54
Not an ideal solution but it'll do in a pinch. – Tiago Lopes Nov 09 '17 at 18:11

score 0 · Answer 5 · answered Nov 14 '15 at 18:45

0

Adding these two lines to -(void)viewDidAppear:(BOOL)animated worked for me.

self.navigationController.navigationBarHidden = NO;
self.navigationController.navigationBar.hidden = YES;

And dont forget to call <UIGestureRecognizerDelegate> to .h file.

answered Nov 14 '15 at 18:45

Vaibhav Saran

12,848
3
65
75

UINavigationContoller interactivePopGestureRecognizer inactive when navigation bar is hidden

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