Is it possible to detect which word was tapped in a UILabel in Cocoa Touch? It 
seems like it should be a pretty easy thing to do, but I'm stuck.

Anybody ever try to do this?

I know you can measure a string and get the bounding box that contains it; 
likewise, looking at the UITextInput protocol it has exactly the right methods 
(closestPositionToPoint & firstRectForRange), but these are limited 3.2 and 
don't seem to apply to UILabel.
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