I have a question on how I should approach rotating a UIView with touch based events.
Quite simply, I want to rotate a UIView around an anchorpoint, depending on where I touch on and off within that view. Imagine a volume knob on a hifi, which you turn with one finger.
I've built a rotation method using CAKeyframeAnimation which carries out a transform.rotation.z, however what I am not sure is if (a) I should use that in conjunction with touch methods, and (b) how I can get the coordinate/angle of the touch in relation to the underlying UIView, and subsequently turn it to point to the touch.
I hope I am making sense… Can anyone make any suggestions?