Singleton Design Pattern

A singleton is an object class designed such that only one instance of that class will ever exist. This can be useful to minimize resources required (e.g., database connections) or ensure consistent data throughout an application (e.g., user preferences).

Add Frameworks in Xcode 4

A lot has changed in Xcode 4. As I recently worked on implementing some web services, I needed to add the libxml2 library to my project.