Problem Statement
Given a new module in a Swift iOS app that needs to handle network requests, caching, UI display and testing, which architectural pattern would you choose (e.g., MVVM, Clean Architecture, VIPER) and why? Outline your choice, layers, data flow and how you ensure testability and maintainability.
Explanation
When deciding the architecture of a new Swift module, you start by analysing complexity, team size, scalability and testability requirements. /n/n If the module handles UI, network, caching and testing, a layered architecture such as Clean Architecture may be a strong choice: you define a Domain layer containing business logic and use cases, a Data layer managing networking and caching repositories, and a Presentation layer with ViewModels and Views (e.g., SwiftUI or UIKit). You ensure dependencies go inward (Presentation depends on Domain, Domain depends on Data) and inject dependencies via constructor injection. Navigation may be managed by a Coordinator. /n/n This setup improves testability (you can mock data repositories), maintainability (clear layer boundaries), and scalability (you can swap caching strategies or network implementations without touching UI). Explaining this in an interview demonstrates depth of architecture knowledge.
Practice Sets
This question appears in the following practice sets: