Mobile Engineering
SwiftUI Architecture for iOS Products That Need to Keep Growing
A scalable SwiftUI codebase is less about adding layers and more about making state, dependencies, navigation and feature boundaries predictable as the product grows.
SwiftUI makes it possible to build polished Apple-platform interfaces quickly, but speed at the view layer does not automatically create a maintainable product. The architecture still needs clear ownership of state, dependencies, navigation and feature responsibilities.
Organize around product features
Structure code around meaningful product capabilities instead of creating one large collection of views, models and helpers. Feature boundaries make ownership and change easier to understand as the app grows.
A feature can own its screens, state, domain logic and tests while depending on shared infrastructure through explicit interfaces.
Make state ownership obvious
SwiftUI works best when the source of truth is easy to identify. Avoid duplicating the same state across several views or allowing unrelated screens to mutate shared data without a clear boundary.
Use observable models deliberately and keep transient view state separate from persistent product state.
Treat dependencies as replaceable collaborators
Networking, persistence, analytics, notifications and purchase logic should not be hidden inside view code. Expose these capabilities through focused dependencies so features remain testable and easier to evolve.
This also makes preview data and automated testing significantly easier.
Test the behavior that carries product risk
Architecture should make important behavior easy to test. Focus automated coverage on domain logic, parsing, purchases, authentication, state transitions and other areas where regressions have meaningful impact.
UI tests are valuable for a smaller set of critical end-to-end journeys, while unit tests can cover broader behavioral logic quickly.
