Building an iOS app with Clean Architecture and SwiftUI
- Eric Palma
- Mar 7, 2024
- 4 min read
Updated: Mar 26
We’ve built the core business layer of our app as a Swift package following Clean Architecture principles, so what does it look like to actually use it to build an iOS app?
In today’s post we will look at exactly that, and how our use cases are utilized by client code to build a functional iOS app.
What’s Covered:
Separation of Concerns: See how Clean Architecture’s layered approach keeps our core business logic independent of platform-specific details.
The Persistence Layer: Learn how we implement the EmployeeRepository protocol with a local JSON file for data storage—and how easily this can switch to a network-based implementation.
The UI Layer with SwiftUI: Discover how SwiftUI interacts seamlessly with our business logic via use cases like FetchEmployeeListUseCase, empowering a clean and modular design.
Tying It All Together: Watch as we assemble the persistence, business, and UI layers into a cohesive app, highlighting how each layer remains independent yet integrated.
What You’ll Gain:
A practical example of Clean Architecture principles in action.
Insights into creating modular, future-proof code that supports growth and changing requirements.
The power of decoupling business logic, persistence, and UI for maintainability and scalability.
In case you haven’t already, head over to our previous article to learn the basics of Clean Architecture and to see how we use it to build a Swift Package containing our app’s business logic.
The Persistence Layer of our iOS App
If you’ll recall from our previous blog post, when developing our use cases, we had to abstract where the Employee data came from. To accomplish this we defined an EmployeeRepository protocol which our use cases depended on for retrieving Employee data.
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