An example app using design patterns.

In this example I used:

• MVC: Model View Controller.

• Singleton: Creating only one instance for exists in the whole app.

• Facade: A single interface to a complex subsystem.

• Decorator: Adds behaviors and responsibilities to an object without modifying its code ( creating category, using a delegate ).

• Adapter: Allows classes with incompatible interfaces to work together ( creating a delegate ).

• Observer: When one object notifies other objects of any state changes ( NSNotificationCenter, KVO ).

• Memento: Captures and externalizes an object’s internal state ( NSUserDefault, archiving ).

• Command: Encapsulates a request or action as an object ( NSMethodSignature, NSInvocation ).

This project was made base on post of Ray Wenderlich's blog