The observer pattern is useful whenever you want a dynamic list of objects (observers) be notified when an event occurs in an observed object (also called the subject).
Cocoa provides several built-in ways to make use of this pattern. If you are interested in a profound comparison, Matt Gallagher has a great summary of the standard [...]

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Part 2: Creating a Foundation-based CLI for Ubuntu
In Part 1: Cross Compiling Foundation I provided a step by step tutorial on how to compile the Cocotron Foundation framework for Ubuntu Linux using Xcode 4.
This post is intended to complete the tutorial by explaining how a simple command line tool can be created which will run [...]

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Part 1: Cross Compiling Foundation
Everyone who knows me knows I’m an advocate of Objective-C, the Foundation framework, and Cocoa. Luckily, in recent years Objective-C has gained wide-spread popularity by virtue of the iPhone/iPad hype. However, there has always been a lack of integration with operating systems not originating from Apple. There are numerous reasons one [...]

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