https://developer.apple.com/library/ios/documentation/UIKit/Reference/UIScreen_Class/index.html#//apple_ref/occ/instp/UIScreen/brightness
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Can you set proximityState to trick the iPhone into thinking that it is close to someone's ear? This would work with the iPhone, but not the iPod touch. There is no way to selectively turn adjust the brightness ... apps that dim the screen typically do so by putting a partly transparent image over the current one.