uipangesturerecognizer

I'm trying to implement a UIView that can be dragged out of its superview. I tried adding a UIPanGestureRecognizer to the view I want to be able to drag. It seems, however, that removing the UIView from its superview and adding it to another view, is breaking the gesture recognizer. With the code within the UIGestureRecognizerStateBegan commented out, the code within the other two blocks functions correctly, but when I reinstate it, the UIGestureRecognizerStateChanged and UIGestureRecognizerStateEnded states are never achieved. What is going wrong? if ([gr state] ==

Is it possible to drag an image from a collectionViewCell into a UIView? I am creating a game where the user can pick a number of items to play with in the next VC. I'm representing each item as an image and the user can select each item by dragging the image to bottom of the screen. The image would then be reset to its original location. If I have the UICollectionView functions in my code, with the image selected in a class of UIViewCollectionView all set up correctly... What do I need to include to move the image from top half (within CollectionView) to bottom half (within UIView). func

I've got a UIScrollView with paging enabled, and I've added my own UIPanGestureRegonizer to it. Under certain instances, my view controller will set scrollview.scrollEnabled = NO , and then add the pan gesture recognizer to it (I'm not using the scrollview's own recognizer). So, scrolling is disabled but I'm waiting for user touches from my gesture recognizer. When it recognizes, it calls its action in which I re-enable scrolling. The problem is, while the user still has a finger down, my scrollview doesn't track with the finger. It doesn't start scrolling until the finger is lifted and then

I am developing an application where I have used the Pan Gesture as well as Swipe Gesture. So every time I do the Swipe Gesture but the method from the Pan Gesture is always getting called and Swipe Gesture method is not getting called. Is there any priority between all the gesture method? You can call them in parallel by implementing the following method of the UIGestureRecognizerDelegate protocol: - (BOOL)gestureRecognizer:(UIPanGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UISwipeGestureRecognizer *)otherGestureRecognizer { return YES; } picciano

I just implemented this: - (BOOL)gestureRecognizerShouldBegin:(UIPanGestureRecognizer *)panGestureRecognizer { CGPoint translation = [panGestureRecognizer translationInView:someView]; return fabs(translation.y) > fabs(translation.x); } (As outlined here .) But if the user pans vertically just over the diagonal it will start. How do I make the tolerance much more strict for what it considers vertical? Basically, the image below describes what I'm after. The first diagram is what it detects now, anything within that area, and the second is what I want it to do. Rob You can use atan2f given x and

In modern user interfaces on iOS, it is often useful to implement multiple UIGestureRecognizers on a single view, in order to provide more realistic behavior of displayed objects that model the real world. For example, you might want to be able to both drag a view around the screen, but also use two fingers to rotate it. The UIGestureRecognizerDelegate provides an optional function shouldRecognizeSimultaneouslyWith for this purpose. Returning true avoids only one gesture having effect at a time: // MARK: - UIGestureRecognizerDelegate extension GestureController: UIGestureRecognizerDelegate {

In my app I'm dismissing a viewController using a UIPercentDrivenInteractiveTransition triggered by a pan gesture. I'm expecting my viewController to be dragged to the right as I'm panning it. However when I slowly pan I get a glitch: the viewController quickly jumps from left to right a bit. This can be seen here: https://youtu.be/3IEtId1w7jM Here's the code for the transition : class FilterHideTransition: UIPercentDrivenInteractiveTransition { let viewController: FilterViewController var enabled = false private let panGesture = UIPanGestureRecognizer() private let tapGesture =