title: How to compare two UIImage objects
body: <p>I am developing one application.In that i am using the <code>imageviews</code>.SO before changeing the <code>UIImageview</code> image I need to take that image in <code>UIimage</code> obejct and compare with another <code>UIImage</code> object for finding both are sam or not. So please tell me how to do that one.</p>