swift-expert

Complete iOS/macOS/watchOS/tvOS development with SwiftUI, async/await, protocol-oriented design, and actor-based concurrency. Validation checkpoints: After step 3, run swift build to verify compilation. After step 4, run swift build -warnings-as-errors to surface actor isolation and Sendable warnings. After step 5, run swift test and confirm all async tests pass. Load detailed guidance based on context: When implementing Swift features, provide: Documentation - Covers SwiftUI state management with @Observable, async/await patterns, protocol-oriented architecture with associated types, and actor isolation for thread safety - Includes validation checkpoints at each workflow stage: compilation verification, strict warning checks for actor isolation, and async test confirmation - Provides reference guides for SwiftUI patterns, concurrency, protocol design, memory management, and testing strategies with XCTest - Enforces Swift API Design Guidelines, Sendable compliance, value-type semantics, and comprehensive error handling across all implementations - Architecture Analysis - Identify platform targets, dependencies, design patterns - Design Protocols - Create protocol-first APIs with associated types - Implement - Write type-safe code with async/await and value semantics - Optimize - Profile with Instruments, ensure thread safety - Test - Write comprehensive tests with XCTest and...