How to track a rotary gesture

Question

I would like to track a ONE finger rotary gesture how do I intercept that gesture?

To give you a visual example: the same gesture that you would have used with an old disc phone.

Answer 1

May I suggest the UIRotationGestureRecognizer class? As long as you don't need to support < iOS 3.2 it will save you much headache trying to build your own gesture recognition mechanism.

Apple Documentation