title: How to force the camera in IOS to re-focus (in objC code)
body: <p>I am playing with the iPhone camera in my app but I could not find a way to take manual control over the timing of re-focusing. In my app, I hope to ensure the best-adjusted image output so a forced re-focus right before taking a shot is needed. More specifically, I would like force the camera to re-focus after the user to hit a button, then take a shot once the re-focusing is complete. What would be the best way to implement this?</p>