Architecture is basically defining the flow of code into layers…
The VIPER architectural pattern is an option in contrast to MVC or MVVM. And keeping in mind that the SwiftUI and Combine systems make an incredible blend that takes care of building complex UIs and moving information around an application, they likewise accompany their own difficulties and conclusions about architecture.
Let’s dig into VIPER Pattern
VIPER: View, Interactor, Presenter, Entity, and Router Model
VIPER is an architectural pattern like MVC or MVVM, yet it isolates the code further by single duty. Apple-style MVC persuades developers to place all rationale into a UIViewController subclass. VIPER, as MVVM before it, tries to fix this issue.
VIPER architecture has 5 parts “View “, “ Interactor “, “Presenter”, “ Entity”, and “Router Modeland” it’s based on the Single Responsibility Principle which provides it with smooth and clean functionality. VIPER offers an approach to building apps with a clean architecture that effectively separates the different functions and responsibilities required, such as the user interface, business logic, data storage, and networking. These are then easier to test, maintain and expand.
VIPER offers a good layer of abstraction resulting in a more scalable and testable code.
- It simplifies complex projects hence making it an ideal choice for large teams.
- It makes the process scalable and enables developers to work simultaneously on a project.
VIPER is an acronym for View-Interactor-Presenter-Entity-Router. Each functionality or module must be defined by these five components.
The integral parts of a VIPER architecture are mentioned below:
> View:
The View is the user interface. It’s responsible for displaying things as directed by the presenter and sends the actions taken by the user to the presenter
> Interactor:
The Interactor is responsible for interacting between the presenter(business logic layer) and the data(domain layer).
> Presenter:
This is our Business logic layer. Directing data between UI layer and Interactor Layer and taking user actions and calling to the router to move the user between views.
> Entity:
It’s the information and data used on the functionality. In our case, it will be CoreData since our information will be stored there.
> Router :
It stores the navigation logic used for describing which screens need to be displayed.
In VIPER Only the presenter talks to the view, and only the interactor talks to the model (entity). The presenter and interactor coordinate with each other. The presenter is concerned with display and user action, and the interactor is concerned with manipulating the data.
Comparison with MVVM:
A design pattern that offers a similar level of abstraction is MVVM (Model-View-ViewModel). Between both patterns, we can identify the similarities, for example:
- The View on MVVM is the View on VIPER;
- The Model on MVVM is the Entity on VIPER;
When to use VIPER Pattern?:
- When you want to keep all the modules isolated.
- When we want a good testing environment
- Should be used only when the developers completely understand the project.
VIPER also has some disadvantages too:
- Generates a lot of boilerplate code, making the initial development phase slower.
- When the application requirements are well-formed.
- Should be used only when the developers completely understand the project
Link for Repository :
flutter-devs/flutter_viper_pattern
A new Flutter project. This project is a starting point for a Flutter application. A few resources to get you started…github.com
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