Microapps architecture in Swift. Dependency Injection.
Article Summary
Majid Jabrayilov explores how microapps architecture can transform your Swift codebase from a monolith into modular, testable components. The secret? Getting dependency injection right from the start.
This deep dive breaks down how to structure iOS apps using microapps architecture, where each feature becomes an independent module with its own dependencies. Majid walks through practical patterns for managing dependencies across modules without creating tight coupling or circular references.
Key Takeaways
- Each microapp owns its dependencies through protocol-based dependency containers
- Parent modules inject dependencies into child modules via initializers
- Environment pattern enables SwiftUI views to access dependencies cleanly
- Protocol composition prevents circular dependencies between feature modules
- Microapps remain testable by mocking dependencies at module boundaries
Protocol-based dependency injection enables truly modular iOS architecture where features can be developed, tested, and deployed independently.
About This Article
Feature modules need access to low-level functionality like networking and caching, but exposing all implementation details creates tight coupling and makes testing harder.
You can define a Dependencies struct within each ViewModel that lists only the required closures. Then use an AppDependencies container to fulfill them, extracting feature-specific dependencies through calculated properties.
Developers can easily mock dependencies for unit tests and Xcode previews by creating static mock extensions. This removes the need to pass entire service instances that have unused methods.
