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?

Solution 1

Set your UIViewController subclass as the gestureRecognizer's delegate:

self.navigationController.interactivePopGestureRecognizer.delegate = self;

That's it!

Solution 2

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;

Solution 3

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...

Solution 4

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];

View more solutions

Comments

[Dan]

Thanks, in fact setting it to nil also works. I wonder if this is a bug?

[Mr. Míng]

There will be a bug if set self.navigationController.interactivePopGestureRecognizer.de‌​legate 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!

[Dennis]

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.

[ninjaneer]

@Dennis having the same problem, but I tried your solution, doesn't seem to be working.

[Arie Litovsky]

I would not recommend this solution. It resulted in several bugs when presenting/popping view controllers.

[Alexi Akl]

You should set it in viewDidAppear -(void)viewDidAppear:(BOOL)animated { self.navigationController.interactivePopGestureRecognizer.de‌​legate = self; }

[malex]

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.

[nekonari]

Did you mean to use UIEdgePanGestureRecognizer?

[Tiago Lopes]

Not an ideal solution but it'll do in a pinch.

[user7097242]

@iwill did you ever figure out how to do this right? Im experiencing the same exact issue you mentioned/

[user7097242]

@ArieLitovsky what would you suggest for this then?

[Mr. Míng]

@user7097242 I posted an answer stackoverflow.com/a/20672693/456536