How to set up a modular architecture based on dynamic frameworks in a large iOS application?

Creating scalable iOS applications often requires transitioning from a monolithic structure to a modular architecture. This allows you to isolate business logic, speed up compilation time through incremental builds, and simplify team development. The first step in this direction is creating separate targets for each module within a shared Xcode workspace.

To implement modularity, local Swift packages or separate dynamic frameworks are used. Each module should be responsible for a strictly defined functional domain, such as authorization, payments, or the user profile. When designing such modules, it is important to minimize direct dependencies between them by building a bottom-up hierarchy.

Dependency management between modules is configured through target settings in Xcode. A top-level module can import base utilities and networking layers, but base modules must not know anything about the UI specifics of higher-level screens. Protocols and the dependency injection pattern are actively used for communication between isolated components, which allows implementations to be swapped out during testing.

Testing each module in isolation from the main application significantly improves code reliability. You can create unit test targets to verify business logic without needing to launch the heavyweight simulator for the entire application. This approach shortens the development feedback loop and guarantees high stability for the finished iOS software product.