Simultaneous gesture recognition for specific gestures

Question

I'm trying to enable simultaneous gesture recognition but only for the UIPinchGestureRecognizer and UIRotationGestureRecognizer gestures. I don't want it to work for any other gestures. If I set the following property to true it allows all gestures to be recognized simultaneously, how can I limit it to just rotating and scaling?

func gestureRecognizer(UIGestureRecognizer, shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {
    return true
}

score 56 · Accepted Answer · edited Mar 21 '17 at 01:59

56

Make sure your class implements UIGestureRecognizerDelegate

class YourViewController: UIViewController, UIGestureRecognizerDelegate ...

Set the gesture's delegate to self

yourGesture.delegate = self

Add delegate function to your class

func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith otherGestureRecognizer: UIGestureRecognizer) -> Bool {
    if (gestureRecognizer is UIPanGestureRecognizer || gestureRecognizer is UIRotationGestureRecognizer) {
        return true
    } else {
        return false
    }
}

edited Mar 21 '17 at 01:59

Michael

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answered Jun 14 '15 at 13:42

Bannings

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12

Don't forget to make yourself a UIGestureRecognizerDelegate – Pbk Apr 21 '16 at 05:23
10

and don't forget to set yourGesture.delegate = self – budiDino Jul 26 '16 at 23:04
1

@budidino I am adding the gestures on a SubClass of UIImageView. I have enabled userInteraction, set the delegate of both the gestures and still it wont call the delegate method. – Skywalker May 25 '18 at 06:44
@Skywalker I'm in the same boat (sub class of a `UIView` inside a `UIScrollView`): Added everything but the func is never called. Did you manage to fix it? – Neph Mar 22 '21 at 14:42

ingconti · Answer 2 · 2020-06-11T11:08:53.853

-1

any 2 cents for swift 5.1

// suppose You need to prefer pinch to pan:

//UIGestureRecognizerDelegate
func gestureRecognizer(_ gestureRecognizer: UIGestureRecognizer, shouldRecognizeSimultaneouslyWith shouldRecognizeSimultaneouslyWithGestureRecognizer: UIGestureRecognizer) -> Bool {

        if gestureRecognizer is UIPinchGestureRecognizer {
            return true
        }
        return false
    }

edited Jun 11 '20 at 11:08

answered Jun 11 '20 at 10:13

ingconti

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Simultaneous gesture recognition for specific gestures

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