hoow to use @mainactor

To use @MainActor in Swift, you can annotate methods or properties to indicate that they should be executed on the main actor, which is typically associated with the main thread. This is particularly useful for UI updates or any code that must run on the main thread.

In the context of migrating to Swift 6, the @MainActor attribute can be used to ensure that certain functions or properties are isolated to the main actor. This helps in maintaining data-race safety and ensuring that UI-related code runs on the main thread.

Here's a brief explanation from the session "Migrate your app to Swift 6":

• You can use @MainActor to annotate methods or properties that need to be executed on the main actor. This is especially useful for UI updates.
• If you have a method that you know will be called on the main actor, you can use MainActor.assumeIsolated to inform the compiler that the code is already running on the main actor. This prevents starting a new task unnecessarily.
• Many delegates and protocols, such as those in SwiftUI, are designed to operate on the main actor and are annotated accordingly. This ensures that they are called on the main actor, either by the framework or by your code when Swift 6 mode is enabled.

For more detailed information, you can refer to the session Migrate your app to Swift 6 (24:15) where these concepts are discussed.