Swift Concurrency Best Practices Specialist

Production Best Practices for Swift Concurrency, Actors & TaskGroup

Learn how to write clean, thread-safe async Swift code using Actors, TaskGroup, Sendable protocols, and @MainActor annotations.

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Pitfalls in Adopting Swift Concurrency

Compiler warnings about non-Sendable types passed across isolation boundaries.

Main actor data races when updating UI from background tasks.

Unchecked Task creation causing uncontrolled thread spawning.

Ignoring task cancellation leading to background resource leaks.

Modern Concurrency Patterns

Decorating UI ViewModels with `@MainActor` to guarantee main-thread UI updates.

Using custom `actor` data stores for safe background mutation of shared state.

Leveraging `withTaskGroup` for controlled parallel API requests.

Checking `Task.isCancelled` inside long-running loops to handle early exit cleanly.

Frequently Asked Questions

Q: What does the @MainActor attribute do?
@MainActor ensures that properties and methods are always executed on the main thread, preventing UI race conditions.
Q: What is a Sendable type in Swift?
A type whose values can be safely shared across concurrent threads without causing data races (e.g. value types like Structs or final immutable Classes).

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