swift-core
Swift 6 fundamentals for all Apple platforms. Use when implementing concurrency, architecture, testing, i18n, or performance optimization across iOS, macOS, iPadOS, watchOS, visionOS.
What this skill does
# Swift Core Swift 6 fundamentals shared across all Apple platforms. ## Agent Workflow (MANDATORY) Before ANY implementation, use `TeamCreate` to spawn 3 agents: 1. **fuse-ai-pilot:explore-codebase** - Analyze existing Swift patterns 2. **fuse-ai-pilot:research-expert** - Verify latest Swift 6 docs via Context7/Exa 3. **mcp__apple-docs__search_apple_docs** - Check Swift concurrency patterns After implementation, run **fuse-ai-pilot:sniper** for validation. --- ## Overview ### When to Use - Implementing async/await, actors, Sendable - Designing app architecture (MVVM, Clean Architecture) - Writing async tests with XCTest - Localizing with String Catalogs - Profiling with Instruments ### Why Swift Core | Feature | Benefit | |---------|---------| | Actors | Thread-safe shared state without locks | | @Observable | Simple reactive state (replaces ObservableObject) | | String Catalogs | Automatic localization with Xcode 15+ | | Instruments | Built-in performance profiling | --- ## Key Concepts ### Concurrency (Swift 6) Modern async/await with strict concurrency checking. Actors provide thread-safe state, Sendable marks safe types. ### Architecture MVVM with @Observable is the recommended pattern. Clean Architecture for complex apps with domain separation. ### Testing XCTest with native async/await support. No need for expectations with async tests. ### Internationalization String Catalogs are mandatory. All user-facing text must be localized. ### Performance Profile with Instruments. Use lazy loading, avoid heavy work in view body. --- ## Reference Guide | Need | Reference | |------|-----------| | Async/await, actors, Sendable | [concurrency.md](references/concurrency.md) | | MVVM, Clean Architecture, DI | [architecture.md](references/architecture.md) | | XCTest, async tests, mocking | [testing.md](references/testing.md) | | String Catalogs, localization | [i18n.md](references/i18n.md) | | Instruments, optimization | [performance.md](references/performance.md) | --- ## Best Practices 1. **Actors for shared state** - Prefer actors over classes with locks 2. **@Observable over ObservableObject** - Simpler, better performance 3. **Structured concurrency** - async/await, no completion handlers 4. **String Catalogs** - ALL user-facing text must be localized 5. **Profile in Release** - Always profile with `-O` optimization 6. **Value types** - Prefer structs over classes
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