title: Ambient light sensors in iphone
body: <p>In our app, If a user covers the top area of iphone where ambient light sensors are available, i want to get the changing value of ambient light sensors. I don't want to manipulate those value as i understand Apple doesn't allow to play with hardware . 
  My objective is to get that value of ambient light sensors. This is testing application which is checking if ambient light sensors are working correctly or not.</p>
  
  <p>I spent lot of time, but couldn't find any thing yet. I tried with UIScreenBrightnessDidChangeNotification, but this is for screen brightness. </p>
  
  <p>Similar kind of functionality is available in android and i could get the value of Ambient light sensors.</p>
  
  <p>Any help would be highly appreciated.</p>