clean-architecture-swiftui

Introduction to Clean Architecture for SwiftUI

The Clean Architecture for SwiftUI project is a demonstration aimed at showcasing the setup and implementation of a SwiftUI app through the principles of Clean Architecture. It leverages modern development techniques using Swift's Combine framework to ensure a robust and scalable application structure.

Overview of the App

The demo application utilizes the REST API provided by restcountries.com to display a list of countries along with detailed information about each. This project illustrates how Clean Architecture can be effectively integrated into an app developed with SwiftUI, providing an efficient way to manage user interactions, data retrieval, and display.

Key Features

• SwiftUI and Combine: The app is implemented using native SwiftUI for building the user interface, enhanced by the Combine framework to handle asynchronous operations and event-driven programming.
• Layered Architecture: A key characteristic of the project is the separation of the Presentation, Business Logic, and Data Access layers, promoting maintainability and modularity.
• Testing: The application boasts comprehensive test coverage, including UI tests facilitated by the ViewInspector library, ensuring reliability and robustness.
• Centralized State Management: It employs a Redux-like centralized AppState to manage the application's state as a single source of truth.
• Data Persistence: Integration with CoreData allows for secure and persistent data storage.
• Dependency Injection: SwiftUI's native dependency injection is utilized to enhance flexibility and reduce tight coupling between components.
• Programmatic Navigation: Enables complex user navigation flows and push notifications with support for deep linking.
• Networking: Features a straightforward yet flexible networking layer built on Generics for effective API communication.
• System Events Handling: The application can handle system events such as didBecomeActive and willResignActive gracefully.
• Scalability: Designed with principles like SOLID, DRY, KISS, and YAGNI, the project is constructed to support growth and can be scaled up for larger, production-level apps.

Architecture Components

Presentation Layer

The presentation layer consists of SwiftUI views responsible for rendering the UI. These views maintain no business logic and are purely a function of the application state. User interactions, such as button taps, trigger side effects that are managed through Interactors.

Business Logic Layer

The business logic layer is defined by Interactors, which handle the execution of business rules and processes. These components receive requests to perform actions like data retrieval or computations and update the AppState or a localized Binding with the results, rather than returning data directly.

Data Access Layer

This layer is represented by Repositories, which provide an asynchronous API for carrying out CRUD operations on databases or remote servers. Repositories are devoid of business logic and interact solely with Interactors to supply data, ensuring a clean separation of concerns.

Conclusion

Designed to serve as a blueprint or reference model, the Clean Architecture for SwiftUI project equips developers with the necessary tools to build efficient, scalable, and maintainable applications. By following a clear separation of concerns and leveraging modern Swift technologies, this project exemplifies best practices in app development using SwiftUI and Combine.