A refresher on MVC
MVC is a design pattern that encourages separation of concerns. It was invented in 1978, and was generalized in the 80s. Smalltalk was the first language to make extensive use of this design pattern for the creation of user interfaces.
Objective-C, being heavily influenced by Smalltalk, then inherited this design pattern. AppKit and UIKit are also built around it.
While one could argue that other patterns can be just as efficient (or more so), MVC has the benefit of being widely understood by many developers, independent of their language of choice. MVC is widely used and is available in all object-oriented languages.
The theory behind the MVC pattern
Let's go back to the original description of the design pattern:
- Model classes are used to represent knowledge and data. A model can be represented as a single object or structures.
- View classes are used to represent the data to the user.
- Controller classes are used to validate input from the user, passing it to the model layer...