Description:

The iPhone is all the rage. Not only does it provide a compelling end-user experience, but behind the scenes is a coding environment with features unlike those found in Java and C++.

This talk shows how to extend Cocoa classes using a language feature called categories, and how to use a technique called swizzling to override existing methods in Cocoa classes. Using this technique you can modify the behavior of a base class so that all subclasses inherit that behavior, including subclasses where you don't have the source and cannot change their class parenting.