iOS: Can I override pinch in/out behavior of UIScrollView?

Question

I\'m drawing a graph on a UIView, which is contained by a UIScrollView so that the user can scroll horizontally to look around the entire graph.

Answer 1

Edsko & bshirley answers are good, but they don't tell where to place the code.

First, I placed it in viewDidLoad method, but no Pinch Gesture Recognizer was found in the scrollview (maybe because my scrollview is an IBOutlet).

Then I tried in viewWillAppear or viewDidAppear and the UIPinchGestureRecognizer was here.