iPhone Circular Progress Indicator [closed]

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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开发者_JS百科 where to begin?

Thanks

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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.

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I'm doing something similar here: https://github.com/DougFischer/DFCircleActivityIndicator

You can check my code and make something more appropriated. In my scenario, I'm drawing once and then I just rotate the image/layer. You'll need to animate the strokeEnd property using something like CABasicAnimation.

This property is animated and if you increase it from 0 to 1, you'll get the "filling effect". Again, in my scenario I need the empty center, probably you won't need it, your line width will be larger.