ios-concurrency

Swift structured concurrency with Task and TaskGroup enables parallel data fetching without leaks by binding child operations to parent scopes. This structured approach automatically cancels pending tasks if the parent fails, ensuring safe concurrent execution and preventing orphaned background operations.

Swift 6 strict concurrency migration requires adopting actor-based isolation, proper Sendable conformance, and nonisolated contexts to satisfy compiler safety checks. This skill provides migration guidance and anti-patterns to systematically eliminate data races during the transition to strict concurrency.

Use actors to isolate shared mutable state during background processing, and apply @MainActor to ensure UI updates execute safely on the main thread. This combination prevents threading bugs and data races by enforcing strict access boundaries across concurrent iOS app operations.

Swift structured concurrency supports bridging callback-based APIs using continuations and processing asynchronous sequences via AsyncStream for background tasks. These mechanisms integrate safely with Task and actor isolation to maintain scalable, leak-free concurrent data flows.

Common Swift concurrency limitations include unstructured Task leaks, improper Sendable conformance causing data races, and blocking the main thread with synchronous waits inside async contexts. Avoiding these anti-patterns ensures scalable parallel execution without threading bugs or performance degradation.