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swift-expert

Provide Swift 5.9+ implementation guidance for SwiftUI, concurrency, and protocol-oriented design.

Updated Mar 17, 2026
Search Tags:#performance#concurrency#swift#swiftui#xctest#actors#protocol-oriented
One-click install
npx skills add https://github.com/Estom/aiflex --skill swift-expert-estom
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: swift-expert
Source: https://github.com/Estom/aiflex/tree/main/skills-repo/Jeffallan-skills/swift-expert
Command: npx skills add https://github.com/Estom/aiflex --skill swift-expert-estom

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

Senior-level guidance for developers who need to design and implement type-safe, concurrent, and performant Apple platform applications using Swift 5.9+, SwiftUI, and modern concurrency patterns. It reduces architecture mistakes, concurrency bugs, and API misuse by enforcing protocol-oriented design, Sendable compliance, and testable components.

Core Features & Use Cases

  • Protocol-first architecture: advice and patterns to design protocols with associated types, type erasure, and conditional conformance for reusable abstractions.
  • Concurrency & safety: actor-based state management, structured concurrency examples, Sendable guidance, and patterns to avoid race conditions and retain cycles.
  • SwiftUI & integration: state management (@State, @StateObject, @ObservedObject, @EnvironmentObject), custom layouts, view modifiers, and mixing UIKit when necessary.
  • Performance & testing: profiling tips, memory/performance optimization, XCTest async tests, and mocking strategies for reliable unit and UI tests.
  • Real-world scenario: design a SwiftUI app with an actor-backed cache, protocol-driven networking layer, and XCTest coverage for async flows.

Quick Start

Use the swift-expert skill to design a protocol-oriented SwiftUI view that loads data asynchronously with actor-backed caching and includes a unit test verifying cancellation and concurrency safety.

Frequently Asked Questions about swift-expert

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I implement actor-based state management and Sendable-compliant concurrency in Swift?▼

Use actors to isolate mutable state and mark custom types as Sendable for safe concurrent execution across async/await boundaries. This enforces compile-time concurrency safety and prevents data races in Swift applications.

What is the best way to design a protocol-oriented networking layer with type erasure in Swift?▼

Define protocols with associated types and conditional conformance, then apply type erasure to hide concrete implementations. This approach creates reusable, type-safe API abstractions that follow Swift API Design Guidelines.

How do I write XCTest unit tests for async flows and cancellation in Swift?▼

Use async XCTest test methods and inject protocol-driven mocks to verify cancellation and concurrency safety. This mocking strategy ensures reliable unit and UI testing for asynchronous flows and actor-backed components.

How do I manage SwiftUI state with @StateObject and @EnvironmentObject when mixing UIKit?▼

Use @StateObject to own lifecycle and @EnvironmentObject for shared data injection. When mixing UIKit, bridge state via custom view modifiers and wrappers to maintain consistent UI composition and data flow.

Does this Swift guidance apply to server-side Swift projects and watchOS app development?▼

Yes, this guidance applies to server-side Swift, watchOS, iOS, macOS, and tvOS development. It covers protocol-oriented design, SwiftUI composition, and performance optimization across all Swift 5.9+ app platforms.

Why does my structured concurrency code have retain cycles and how do I optimize Swift performance?▼

Structured concurrency code develops retain cycles when capturing strong references across async boundaries. Fix cycles and optimize performance by profiling, enforcing Sendable compliance, and using weak captures within actor patterns.

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