How to do pinch gestures on the iPhone?

Question

How does one implement pinch gestures on the iPhone? I\'m familiar with using touch events on the iPhone but I\'m extremely lazy and don\'t want to re-invent the wheel for somet

Answer 1

If you're looking for a simple code example of the pinch gesture, I use the method described by Brock in the example application I describe here (in the second-to-last and last versions of the application on that page). The pinch gestures are used to scale a couple of Core Animation layers in that example.

All he's describing as far as the distance calculation is simply the Pythagorean Theorem applied between two points (with the X and Y distances as the two faces of a right triangle).