swift-concurrency

Solve SwiftUI data races with actors and structured concurrency.

Updated Jan 22, 2026

Search Tags:#concurrency #swift #async-await #reactive #actors #thread-safety #asyncstream

Ready to run

npx skills add https://github.com/devzahirul/TDDHighPerformance-ecommerceSwiftui --skill swift-concurrency-devzahirul

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: swift-concurrency
Source: https://github.com/devzahirul/TDDHighPerformance-ecommerceSwiftui/tree/main/.agent/skills/swift-concurrency
Command: npx skills add https://github.com/devzahirul/TDDHighPerformance-ecommerceSwiftui --skill swift-concurrency-devzahirul

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Swift UI apps often encounter data races and complex synchronization when updating UI from asynchronous tasks. This skill demonstrates how to safely model shared state with actors and structured concurrency to guarantee thread-safety and predictable data flows.

Core Features & Use Cases

Actor-backed state stores to isolate data and prevent race conditions
AsyncStream-based observation to react to state changes
MainActor integration to keep UI updates on the main thread
Structured concurrency patterns for clear task lifecycles

Quick Start

Create a small SwiftUI app that demonstrates an actor-backed store using async/await and AsyncStream.

Frequently Asked Questions about swift-concurrency

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

FAQPage Schema

How do I prevent data races in SwiftUI when updating UI from async tasks?▼

Preventing data races in SwiftUI requires isolating shared state using actors to guarantee thread-safety. This approach manages predictable data flows by confining state mutations within actor isolation boundaries, ensuring safe concurrent access.

How does AsyncStream work for observing state changes in Swift?▼

AsyncStream in Swift works by providing an asynchronous sequence to reactively observe state changes. It integrates with actor-backed stores to push reactive data flows safely across components, allowing UI updates to respond to asynchronous state mutations.

Can I use structured concurrency to manage task lifecycles in iOS apps?▼

You can use structured concurrency to manage task lifecycles in iOS apps by applying clear parent-child task hierarchies. This pattern ensures predictable state management and responsive interfaces by automatically handling task cancellation and completion.

What is the best way to keep UI updates on the main thread with async/await?▼

The best way to keep UI updates on the main thread with async/await is through MainActor integration. This ensures that asynchronous APIs dispatch UI state mutations predictably onto the main thread, maintaining responsive interfaces.

Does actor isolation work for managing shared state across asynchronous components?▼

Actor isolation works effectively for managing shared state across asynchronous components by serializing access to prevent race conditions. It creates safe, maintainable Swift code by ensuring data mutations occur without concurrent synchronization conflicts.

When should I not use actors for thread-safety in Swift?▼

You should not use actors for thread-safety in Swift when state mutations are purely value-based and local, avoiding unnecessary isolation overhead. If components do not require asynchronous APIs or shared mutable state, actor isolation adds unnecessary complexity.