ios-swift-concurrency

Async/await in Swift enables structured concurrency for network operations. Define async functions that return results without blocking the main thread, use Task to manage execution, and apply MainActor to ensure UI updates occur on the main thread. This replaces callback-based patterns with linear, readable code.

Actors isolate mutable state and enforce serial access, eliminating data races. Combine actors with async/await and structured concurrency to ensure only one task accesses shared data at a time. MainActor specifically protects UI state from concurrent modification across threads.

Task management in Swift concurrency allows you to track, monitor, and cancel async work. Store Task references, call cancel() to stop execution, and use Task.isCancelled checks within async functions to respond gracefully. TaskGroup enables coordinated cancellation of multiple child tasks.

Yes. Bridging continuations connect async/await with Combine publishers, allowing you to convert between paradigms. Use withCheckedContinuation or withCheckedThrowingContinuation to wrap Combine flows into async functions and integrate them into structured concurrency workflows.

Typed async functions propagate errors through throws declarations. Use try/catch around await calls or apply TaskGroup with error handling to coordinate exception propagation. Structured cancellation ensures cleanup occurs even when errors interrupt task execution.

Task launches a single async operation; TaskGroup manages multiple child tasks collectively. Use TaskGroup when you need coordinated execution, shared error handling, or cancellation of dependent work. Both enforce structured concurrency and resource cleanup.