Antoine van der Lee • 11/10/2025

MainActorMessage & AsyncMessage: Concurrency-safe notifications

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This technical article details Apple's new concurrency-safe notification APIs (MainActorMessage & AsyncMessage) introduced in iOS/macOS 26+. It explains the limitations of the standard Notification Center in Swift Concurrency, provides code examples comparing old and new observer patterns, and demonstrates how to eliminate isolation warnings for notifications like UIApplication.didBecomeActiveNotification.

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#concurrency #Notifications #Io
MainActorMessage & AsyncMessage: Concurrency-safe notifications

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