claudegoodies
Skill

swift-expert

From Jeffallan

Builds iOS/macOS/watchOS/tvOS applications, implements SwiftUI views and state management, designs protocol-oriented architectures, handles async/await concurrency, implements actors for thread safety, and debugs Swift-specific issues. Use when building iOS/macOS applications with Swift 5.9+, SwiftUI, or async/await concurrency. Invoke for protocol-oriented programming, SwiftUI state management, actors, server-side Swift, UIKit integration, Combine, or Vapor.

Facts

Repository
Jeffallan/claude-skills
Status
Actively maintained
Last commit
Source file
skills/swift-expert/SKILL.md

Source preview

The instructions Claude Code reads when this skill runs.

# Swift Expert

## Core Workflow

1. **Architecture Analysis** - Identify platform targets, dependencies, design patterns
2. **Design Protocols** - Create protocol-first APIs with associated types
3. **Implement** - Write type-safe code with async/await and value semantics
4. **Optimize** - Profile with Instruments, ensure thread safety
5. **Test** - Write comprehensive tests with XCTest and async patterns

> **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.

## Reference Guide

Load detailed guidance based on context:

| Topic | Reference | Load When |
|-------|-----------|-----------|
| SwiftUI | `references/swiftui-patterns.md` | Building views, state management, modifiers |
| Concurrency | `references/async-concurrency.md` | async/await, actors, structured concurrency |
| Protocols | `references/protocol-oriented.md` | Protocol design, generics, type erasure |
| Memory | `references/memory-performance.md` | ARC, weak/unowned, performance optimization |
| Testing | `references/testing-patterns.md` | XCTest, async tests, mocking strategies |

## Code Patterns

### async/await — Correct vs. Incorrect

```swift
// ✅ DO: async/await with structured error handling
func fetchUser(id:
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