What is PurpleEventCallback?

Question

In the stack trace of my iPhone application, I see a call to a PurpleEventCallback call. I could not find the documentation. What is it?

Answer 1

The Purple project was codenamed iOS when it was basically a skunkworks project at Apple. This callback is basically an event bridge between the CoreFoundation layer (ported from OS X) and the UIKit layer (Cocoa's next generation infrastructure).

• How the magenta project turned into an iPhone

Answer 2

Another piece of information about PurpleEventCallback.

This is part of the graphic services. In case you have taken apart the GraphicsServices infrastructure, you will find the source code for this method.