iPhone Circular Progress Indicator

Question

I'm trying to create a circular progress indicator like Shazam. It will represent progress during recording. There will be a finite amount of time and I want it to react to the sound level like Shazam's does. Any clues where to begin?

Thanks

Answer 1

Subclass an UIView (maybe CircularProgress : UIView) and draw it manually with Quartz (paths, circles, etc) on the drawRect method passing the % of the progress as it changes.