Drag to rotate in iPhone-app

Question

Hello,

I'm trying to drag a UIImageView according to an anchorPoint but the whole image move. In fact i have a view for my app settings and one parameter is setted with a dial (with a hand/needle(?)). I'd like the rotation center of the needle/hand doesn't move when i'm dragging it.

Thanks for your future answers.

Answer 1

You will have to set up a transform rotation on the layer of your needle.

The perfect sample code for you to look at is the Metronome app that Apple provides. This will be very similar to what you want to do.