CODEWITHSUNDEEP
iosuigesturerecognizeruipageviewcontroller
Alexey Kuznetsov
Alexey Kuznetsov

Reputation: 159

2 UIPageViewControllers gestures conflict

I've got 2 UIPageViewControllers one inside other, both with horizontal scroll. One fullscreen, containing all the user info, another - photo gallery for this user. Behavior: when i swipe all the user photos, it swipes the fullscreen. But sometimes, i can't swipe photos, seems like this gesture is blocked, and it swipes only the first pager. But it unblocks when i make back swipe gesture. Here is a video, of what i'm talking about: https://youtu.be/Hr7tDKNv15A Help me find error causing it, at now I can't imagine how i need to debug that.

Overrided hitTest of container view, which stores inner pager:

override func hitTest(point: CGPoint, withEvent event: UIEvent?) -> UIView? {
        if pointInside(point, withEvent: event) {
            print("Inside")
            print("Self view:\(self)")
            print("Self subviewsview:\(self.subviews)")
            print("Self subviewsview of subview:\(self.subviews[0].subviews)")

            return self.subviews[0].subviews[0]

        } else {
            print("Outside")
            return nil
        }

    }

That's my output, when i touch photos:

Inside
Self view:<armeniaApp.debugGesture: 0x7f7f8be46e60; frame = (0 0; 400 400); opaque = NO; autoresize = RM+BM; layer = <CALayer: 0x7f7f8be1e7c0>>
Self subviewsview:[<_UIPageViewControllerContentView: 0x7f7f8be920a0; frame = (0 0; 400 400); clipsToBounds = YES; opaque = NO; autoresize = W+H; layer = <CALayer: 0x7f7f89ff1e00>>]
Self subviewsview of subview:[<_UIQueuingScrollView: 0x7f7f8a836e00; frame = (0 0; 400 400); clipsToBounds = YES; gestureRecognizers = <NSArray: 0x7f7f8be81db0>; layer = <CALayer: 0x7f7f8be522b0>; contentOffset: {400, 0}; contentSize: {1200, 400}>]

So the gesture that i need stores in UIQueuingScrollView but what i need to do next? return self.subviews[0].subviews[0] doesn't help

Upvotes: 1

Views: 405

Answers (1)

Matthew Hallatt
Matthew Hallatt

Reputation: 1380

I'd suggest taking a look at requireGestureRecognizerToFail: https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIGestureRecognizer_Class/#//apple_ref/occ/instm/UIGestureRecognizer/requireGestureRecognizerToFail:

It seems like UIKit is getting confused as to which page controller to pass the gestures on to as they will both be listening for the same thing.

I'd imagine you want the outer page view controller's gesture recognisers (accessible as an array property: self.pageViewController.gestureRecognizers) to require the gesture recognisers of the inner page view controller to fail. That way the swipe between photos will take precedence, but if there are no further photos to swipe to, you should be able to swipe between profiles.

Upvotes: 1

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