Detecting circular touch iphone sdk

Question

i want to detect when user uses one finger to make a circular motion on a UIView

any help will be appreciated

Answer 1

Subclass youe UIView and implement

– touchesBegan:withEvent:
– touchesMoved:withEvent:
– touchesEnded:withEvent:
– touchesCancelled:withEvent: 

In touch moved you get the new touch points and you can see if the touch points are on a circle arc.

Answer 2

I know it's bad practice to answer with a bunch of links. But so is reinventing the wheel.

Take a look at:

Recognising a circle gesture to drop an annotation, how to detect circle?

How to detect a circle motion with UIGestureRecognizer

How to detect circular gesture via Gesture Recognizer?

All the linked questions include accepted answers.