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As far as I can tell the iPhone multitouch framework sends the location of each touch but not the size.
I want to allow the user to tap a button with the tip of their thumb, or to put the pad of their thumb across multiple buttons (not real UIButtons) and have my touch tracking code realize it needs to press all the buttons the thumb is over.
Since UITouch handles the touch and nothing is said about the size, i’d say no you can’t. You better try another approch like a drag..