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i am creating an application in which i am loading the camera view on the viewdidload. i want to put a slider above the camera view so that when the user slides it the view through camera zooms in and out. i want to zoom in and zoom out before taking picture. i dont know exactlly how to do it. can someone give me idea. i read somewhere that i should use nstimer to take images every 0.01 sec and then zoom in the most recent image to give the effect of zoom in.

but i dont know how to programmaticaly capture images without user interaction(i.e. without clicking the shoot button on uiimagepickercontroller) and how its gonna work too fast so that user is fooled that its view that is zooming not the pictures taken.

please help with any idea or some code to help me as i am newbie.