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In the stack trace of my iPhone application, I see a call to something called PurpleEventCallback. I wasn't able to find any documentation for it. What is this?
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Project Purple was the codename for iOS back when it was basically a skunkworks project within Apple. This callback is basically just an event bridge between the CoreFoundation layer (ported from OS X) and the UIKit layer (the next-generation Cocoa framework).
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