swiftui concurrency
Asked on 2025-06-20
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SwiftUI leverages Swift concurrency to enhance app performance by offloading compute-intensive tasks from the main thread. This is crucial for maintaining a responsive user interface, especially when dealing with animations or complex calculations. SwiftUI's concurrency model allows certain operations, like animations and visual effects, to be performed on background threads, freeing up the main thread for other tasks.
In the session Explore concurrency in SwiftUI, it is explained how SwiftUI uses concurrency annotations to express runtime semantics, ensuring that your app runs efficiently and safely without data races. The session also discusses the use of the Mainactor annotation, which is applied to SwiftUI APIs to reflect their default runtime behavior, ensuring that UI updates are performed on the main thread.
For a practical approach to improving app performance with Swift concurrency, the session Code-along: Elevate an app with Swift concurrency provides a step-by-step guide on how to introduce asynchronous code and offload tasks to background threads.
If you're interested in learning more about structured concurrency and how it can help prevent data races, the session Embracing Swift concurrency is a great resource. It covers the basics of Swift concurrency, including asynchronous tasks and actor isolation, to help you write concurrent code with confidence.
Explore concurrency in SwiftUI
Discover how SwiftUI leverages Swift concurrency to build safe and responsive apps. Explore how SwiftUI uses the main actor by default and offloads work to other actors. Learn how to interpret concurrency annotations and manage async tasks with SwiftUI’s event loop for smooth animations and UI updates. You’ll leave knowing how to avoid data races and write code fearlessly.
What’s new in SwiftUI
Learn what’s new in SwiftUI to build great apps for any Apple platform. We’ll explore how to give your app a brand new look and feel with Liquid Glass. Discover how to boost performance with framework enhancements and new instruments, and integrate advanced capabilities like web content and rich text editing. We’ll also show you how SwiftUI is expanding to more places, including laying out views in three dimensions.
Code-along: Elevate an app with Swift concurrency
Learn how to optimize your app’s user experience with Swift concurrency as we update an existing sample app. We’ll start with a main-actor app, then gradually introduce asynchronous code as we need to. We’ll use tasks to optimize code running on the main actor, and discover how to parallelize code by offloading work to the background. We’ll explore what data-race safety provides, and work through interpreting and fixing data-race safety errors. Finally, we’ll show how you can make the most out of structured concurrency in the context of an app.