Model-View-Controller (MVC) architecture in iPhone applications development

The structure of iPhone applications code is based on the Model-View-Controller (MVC) architecture. It benefits the iPhone applications development or the object-oriented programs as a whole in many ways. MVC–based programs can be adaptable to changing requirements and their objects more reusable.

The main goal of the MVC architecture in iPhone applications development is to separate business logic, such as your application’s data and the rules that govern your application, from the user interface (presentation layer).

The MVC architecture considers there to be three types of objects:
1. Model objects
2. View objects
3. Controller objects

A goal of a MVC based application also should be to reuse as many objects as possible. View objects and model objects should be highly reusable and application-specific behavior should be implemented in controller objects.

Design Guidelines:

• Dependency should be minimal in case of all the MVC architecture implementations
• MVC roles can be merged in an object although making that object acts as both the controller and view object. Then it would be called a view controller. In the same way, you can also combine model-controller objects. Following MVC architecture makes code more reusable, understandable and extendable
• It is good design that a view object use controller object as mediator to know about changes in an model object

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Happy iPhone programming!


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