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Beginning, Mac OS® X Snow Leopard™ Programming by Drew McCormack, Michael Trent

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Chapter 8. Introduction to Cocoa

WHAT YOU WILL LEARN IN THIS CHAPTER:

  • How to use outlets and actions to connect Cocoa application interfaces to your custom code

  • How to use Cocoa Bindings as an alternative to outlets and actions

  • How Apple uses the Model/View/Controller design pattern to build reusable, extendable classes

People use the word "Cocoa" in different ways to describe different things. For example, Cocoa can refer to the Objective-C programming language and dynamic runtime. In Chapter 7, you learned how to write simple programs in Objective-C. Some of that material, such as object reference counting, is specific to Cocoa.

Cocoa also applies to the Objective-C frameworks and libraries commonly used by Cocoa applications. Two principal frameworks among these include AppKit and Foundation. A few other frameworks seem to be a part of the Cocoa family in one way or another, including the PreferencePanes and WebKit frameworks.

The Foundation framework contains Objective-C objects, protocols, and functions that are useful to Mac OS X programs in general, regardless of whether they are meant to be user-friendly applications or low-level system utilities. For example, things such as collection classes, file I/O, and memory utilities are defined in Foundation. Also, some functionality commonly thought of as high-level application functionality lives in Foundation because it doesn't involve any user interface (UI). The management of both undo and user preferences are part of Foundation. ...

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