MVVM Design Pattern - iOS Design Patterns - raywenderlich.com

In this video, you’ll learn about Model-View-ViewModel (MVVM) which you’ll use to further combat massive view controllers.

Find the full course here:

https://videos.raywenderlich.com/courses/72-ios-design-patterns/lessons/1

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About MVVM from Wikipedia:

Model–view–viewmodel (MVVM) is a software architectural pattern.

MVVM facilitates a separation of development of the graphical user interface – be it via a markup language or GUI code – from development of the business logic or back-end logic (the data model). The view model of MVVM is a value converter,[1] meaning the view model is responsible for exposing (converting) the data objects from the model in such a way that objects are easily managed and presented. In this respect, the view model is more model than view, and handles most if not all of the view's display logic.[1] The view model may implement a mediator pattern, organizing access to the back-end logic around the set of use cases supported by the view.

MVVM is a variation of Martin Fowler's Presentation Model design pattern.[2][3] MVVM abstracts a view's state and behavior in the same way,[3] but a Presentation Model abstracts a view (creates a view model) in a manner not dependent on a specific user-interface platform.
MVVM and Presentation Model both derive from the model–view–controller pattern (MVC).

MVVM was developed by Microsoft architects Ken Cooper and Ted Peters specifically to simplify event-driven programming of user interfaces—by exploiting features of Windows Presentation Foundation (WPF) (Microsoft's .NET graphics system) and Silverlight (WPF's Internet application derivative).[3] John Gossman, one of Microsoft's WPF and Silverlight architects, announced MVVM on his blog in 2005.

Model–view–viewmodel is also referred to as model–view–binder, especially in implementations not involving the .NET platform. ZK (a web application framework written in Java) and KnockoutJS (a JavaScript library) use model–view–binder

About Design Patterns:

In software engineering, a software design pattern is a general reusable solution to a commonly occurring problem within a given context in software design. It is not a finished design that can be transformed directly into source or machine code. It is a description or template for how to solve a problem that can be used in many different situations. Design patterns are formalized best practices that the programmer can use to solve common problems when designing an application or system.

Object-oriented design patterns typically show relationships and interactions between classes or objects, without specifying the final application classes or objects that are involved. Patterns that imply mutable state may be unsuited for functional programming languages, some patterns can be rendered unnecessary in languages that have built-in support for solving the problem they are trying to solve, and object-oriented patterns are not necessarily suitable for non-object-oriented languages.

Design patterns may be viewed as a structured approach to computer programming intermediate between the levels of a programming paradigm and a concrete algorithm.

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