AuthorKeyur Patel is a Manager of Siya Infotech Solutions, a leading iPhone development and Android development company. He has more than 7 years’ experience in mobile app development using all kind of app development techniques and tools. ArchivesCategories |
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There are four different iOS architectural patterns and all of them have and the differences between them are explained. All these iOS architecture layers MVC, MVP, MVVM, and VIPER that might be helpful while developing the appropriate iOS application architecture. The Model-View-Controller Pattern: MVC is the fundamental pattern that has proven itself as a useful tool in multiple technologies, contributed to their development, and is generally a helpful assistant for developers. If you are looking for the ask architects what the best way to realize this pattern, most likely to get different versions and solutions. The great part of these A significant feature of all the patterns is the detachment of UI from the coding logic, which designers to do without need to consider the code. MVC pattern is capable of separating UI elements from the domain logic and from the data. Therefore, MVC in its original view consists of three categories that constitute its name. The breakdown, offers better understanding the entities, reuse them, and test them separately. By dividing the entities into various components, it is easy to define their contribution to a good architecture, which has the features of balanced duty distribution and inexpensive maintenance. MVP: With Bindings and Hooters: There is the other flavor of the MVP , Supervising Controller MVP. This includes direct binding of the View and the Model while the Presenter still handles actions from the View and it is also capable of changing the View. Supervising Presenter variant of the MVP: Vague responsibility, separation is bad, as well as tight coupling of the View and the Model. That is very much similar to how things work in Cocoa desktop development. MVVM:
What is the View Model in the iOS reality? It is generally UIKit independent representation of your View and its state. The View Model invokes changes in the Model and updates itself with the updated Model, and since we have a binding between the View and the View Model, the first is updated accordingly. The last nominee is very interesting as it does not belong to the MV category. iOS Patterns VIPER: VIPER takes another step towards that separation and offers five layers instead of the usual three. Interactor has domain logic that is connected to the Entities, for example, the creation of a new entity which retrieving from the server. For these it’s better to user services and Managers that are treated more like external dependencies, not parts of the VIPER module. Presenter contains certain important logic attached to the UI and calls out for methods on the Interactor. Entities are nothing but a simple data objects which are not related to the data access layer which is the Interactor responsibility. Router manages transitions between the VIPER modules. VIPER module can use for app’s screen or for the entire user story. For example, authentication process can take one screen or more than consecutive screens. However, it is up to iOS developer to figure out the optimal size of your module. These are the core separation of duties differences between VIPER and MV(X)-like patterns: 1. Model-based logic shifts to the Interactor level. 2. Entities are data structures that stay idle. 3. Presenter does not alter the data, but has Controller/Presenter/ViewModel UI representation duties migrated into it. VIPER is the first template to tackle the navigation problem and it is using Router for that purpose. Interactor: It contains business logic related to the data or networking, like creating new instances of entities from the server. For those purposes, you will see use some Services and Managers which are not considered as a part of VIPER module but instead it is an external dependency. Presenter: Contains the UI related business logic, which invokes methods on the Interactor. Entities: Plain data objects, not the data access layer, because that is a responsibility of the Interactor. Router: Responsible for the segues between the VIPER modules. VIPER module can be a one screen or the whole user story of the application think of authentication, which can either only for one screen or several related ones. Moreover, VIPER module can be your app’s screen or the entire user story. For example, authentication process can take one screen or several consecutive screens. It’s up important for you to decide the optimal size of your module. These are the core separation of duties differences between VIPER and MV(X)-like patterns: 1. Model-based logic shifts to the Interactor level. 2. Entities are data structures that stay idle 3. Presenter does not alter the data, but has Controller/Presenter/ViewModel UI representation duties migrated into it. Viper is able to tackle the navigation problem and it utilizes Router. Conclusion: Here, I went through several architectural patterns, and try to give certain answers to what bothered you, but I have no doubt that you realized that there is no specific rule for selecting an architecture pattern is a matter of weighting tradeoffs for that specific project.
Therefore, it is naturally possible to have a mix of architectures in the same app. For example: you’ve started with MVC, then you realized that one screen became too hard to with the MVC and switched to the MVVM, but only for this particular screen. There is no need to refactor other screens for which the MVC does work fine, because both of architectures are very compatible.To develop apps using iOS architecture you should hire iPhone app developers who have the capacity to develop an app using various kinds of above discussed methods.
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