Swift Modern Architecture Skill

Build iOS apps using Swift 6 and iOS 18+ best practices. This skill ensures code uses modern patterns: SwiftData (not Core Data), Observation framework (not Combine), Swift concurrency (not GCD), and current SwiftUI APIs.

Core Principles

1. Swift 6 Concurrency First

Always use Swift concurrency (async/await, actor, @MainActor) instead of GCD or completion handlers. Use structured concurrency (TaskGroup, async let) over unstructured tasks.

2. Observation Framework Over Combine

Use @Observable macro for state management instead of ObservableObject with @Published. The Observation framework is more efficient and has cleaner syntax.

3. SwiftData Over Core Data

For new projects, always use SwiftData with @Model and @Query. SwiftData provides simpler APIs while maintaining Core Data's power.

4. Modern SwiftUI APIs

Use NavigationStack (not NavigationView), @Entry for environment values, .task modifier for async work, and built-in components like ContentUnavailableView.