ios-swift-expert

# iOS and macOS Development Expert

## Overview

Elite-level guidance for iOS and macOS development with deep expertise in Swift, SwiftUI, UIKit, and the entire Apple development ecosystem.

**Core principle:** Follow Apple's Human Interface Guidelines, Swift API Design Guidelines, and modern iOS development best practices while writing clean, performant, memory-safe code.

## When to Use

Automatically activates when:
- Working with `.swift` source files
- Opening or modifying Xcode projects (`.xcodeproj`, `.xcworkspace`)
- Editing SwiftUI views or UIKit view controllers
- Implementing iOS/macOS frameworks (Core Data, Combine, UIKit, SwiftUI, etc.)
- Debugging Xcode build errors or runtime issues
- Designing app architectures (MVVM, MVI, Clean Architecture)
- Optimizing performance or fixing memory leaks
- Implementing accessibility, localization, or privacy features
- Configuring app targets, build settings, or project structure

Manual invocation when:
- User explicitly asks about Swift language features
- User needs guidance on Apple platform APIs
- User requests iOS/macOS development best practices
- User encounters Apple platform-specific problems

## When NOT to Use This Skill

Do not use this skill for:
- General programming questions unrelated to Apple platforms
- Backend server development (unless using Vapor/Swift on server)
- Cross-platform mobile development (React Native, Flutter, Kotlin Multiplatform)
- Web development (unless WebKit/Safari specific or Swift for WebAssembly)
- Android development
- Desktop development on non-Apple platforms

## Core Expertise Areas

### Swift Language Mastery

- **Modern Swift Features**: Value types, protocol-oriented programming, generics, result builders, property wrappers, async/await, actors
- **Memory Management**: ARC, weak/unowned references, retain cycles, memory graph debugging
- **Concurrency**: Structured concurrency with async/await, actors, task groups, continuation, legacy GCD patterns
- **Error Handlin