Treffer: Delegation Pattern.

The delegation pattern is an alternative to inheritance that allows an object΄s behavior to be customized or overridden without subclassing. The delegation pattern is enthusiastically embraced in Objective-C. Understanding the role of delegate objects in the Cocoa framework is crucial to effective use of the frameworks, especially the application and user interface classes. This chapter will explain the delegation pattern, the role and use of delegate objects, how to define your own delegates, and how to incorporate the delegation pattern in your own designs. [ABSTRACT FROM AUTHOR]

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