How to detect pinch in gesture vs pinch out gesture?
cocoa-touch, ios, objective-c, uipinchgesturerecognizer
Solution
Well, that seems an easy one. The `UIPinchGestureRecognizer` class has only two properties, `scale` and `velocity`. It seems logical that a negative `scale` would mean an inward pinch, a positive `scale` an outward pinch.
NB: "negative" might be misleading. "Smaller" is `0.0 < scale < 1.0`, "bigger" is `scale > 1.0`.
Problem
Instead of scaling, which I think pinch gesture is usually used for, I am looking to just detect whether the pinch was a pinch in vs pinch out so I can collapse or expand some table sections. How would I go about doing that?