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POPass a UIPanGestureRecognizer from one view to be handled by another view
 

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    <p>I am using a UIPageViewContoller to create a book-like page turning experience. The pages for my book are 18px narrower than the full width of the iPhone screen and are anchored on the left side of the screen. The frame for my UIPageViewController's view is then set to the frame size of these pages (width:302, height:460). I do this to give an effect that the book has multiple pages and for the page turn to look like it starts from the edge of the current visible page, just like the experience in the iBooks app.</p> <p>The issue I am having is if someone tries to turn a page by panning from the far right of the screen, past the 302 px point, the pan gesture is not captured by the UIPageViewController and the page is not turned. I have watched a lot of users try to turn a page this way so I would like to fix this experience without changing the UI design.</p> <p>My thinking is that I can grab the UIPanGesture from the area outside of the UIPageViewController and pass it to the UIPageViewController. I've successfully captured the pan gesture using an image view I have as the background of the whole view, but I can't figure out how to pass the gesture to the UIPageViewController to handle the page turn.</p> <pre><code>- (void) viewDidLoad { ... // Add a swipe gesture recognizer to grab page flip swipes that start from the far right of the screen, past the edge of the book page self.panGesture = [[[UIPanGestureRecognizer alloc] initWithTarget:self action:nil] autorelease]; [self.panGesture setDelegate:self]; [self.iv_background addGestureRecognizer:self.panGesture]; //enable gesture events on the background image [self.iv_background setUserInteractionEnabled:YES]; ... } #pragma mark - UIGestureRecognizer Delegates - (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch { // test if our control subview is on-screen if (self.pageController.view.superview != nil) { if (gestureRecognizer == self.panGesture) { // we touched background of the BookViewController, pass the pan to the UIPageViewController [self.pageController.view touchesBegan:[NSSet setWithObject:touch] withEvent:UIEventTypeTouches]; return YES; // handle the touch } } return YES; // handle the touch } </code></pre>
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    1. USchazzwozzer
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    1. CODid you find a way to do this? I'm trying something similar. I have a Media Subview that has shapes in it. I want to Drag a shape out of the Subview and then continue dragging it on the main canvas view.
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      1. USscooter133
    2. CONo solutions yet, I hope this post gets some love soon.
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    3. COI've seen a few Apps with it. By Current thought is that the Gesture is Transparent on the TopView and then is passed the the lower destination view. The Gesture then converts it coordinates to the upper view and determines what was actually clicked on in that view, create the drag Image then move it. Just a thought at this point though.
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