swift-concurrency

Swift concurrency enables safe async code by using async-await for readable flows and actors for isolation. Actors prevent data races by serializing access to their mutable state, while structured concurrency patterns manage task lifecycles automatically.

The best way to run parallel tasks in Swift is using TaskGroups to spawn and manage concurrent child tasks. TaskGroups provide controlled concurrency, automatically canceling remaining tasks if one throws an error, ensuring structured and safe parallel execution.

Sendable in Swift concurrency ensures thread safety by marking types as safe to pass across concurrent execution boundaries. Conforming a type to Sendable guarantees it contains no mutable state or safely synchronizes access, preventing data races during concurrent execution.

Yes, you need Swift 5.5 and Xcode 12 at minimum to use structured concurrency features on iOS. These versions introduced native async-await syntax, actors, and Sendable protocols, which are required to implement the safe and efficient asynchronous patterns.

MainActor concurrency issues in iOS occur when non-isolated code interacts with MainActor state without proper await boundaries. MainActor isolates execution to the main thread, but crossing isolation domains requires explicit async calls to maintain safe concurrent execution.

Yes, you can use Swift concurrency patterns like async-await in macOS development. The concurrency concepts including actors, TaskGroups, and Sendable types apply across both iOS and macOS platforms, enabling safe and efficient concurrent code in Apple ecosystems.