# dynamic-actor-isolation

Published articles for dynamic-actor-isolation.

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## Swift 6 Gave Me Zero Warnings, but Two Objective-C Callbacks Still Crashed at Runtime

DevFeed: [Swift 6 Gave Me Zero Warnings, but Two Objective-C Callbacks Still Crashed at Runtime](<https://devfeed.tech/articles/swift-6-gave-me-zero-warnings-but-two-objective-c-callbacks-still-crashed-at-runtime-58017.md>)

Original publisher: [Read original article](<https://hackernoon.com/swift-6-gave-me-zero-warnings-but-two-objective-c-callbacks-still-crashed-at-runtime?source=rss>)

Author: Amana

Published: 2026-09-22T14:42:08Z

Content type: article

Language: en

Sources: [HackerNoon](<https://devfeed.tech/sources/hackernoon.md>)

Topics: [Swift](<https://devfeed.tech/topics/swift.md>), [Actor](<https://devfeed.tech/topics/actor.md>), [Objective-C](<https://devfeed.tech/topics/objective-c.md>), [iOS](<https://devfeed.tech/topics/ios.md>), [Xcode](<https://devfeed.tech/topics/xcode.md>), [Closure](<https://devfeed.tech/topics/closure.md>), [Code](<https://devfeed.tech/topics/code.md>)

Tags: [actor](<https://devfeed.tech/tags/actor.md>), [amana](<https://devfeed.tech/tags/amana.md>), [apple](<https://devfeed.tech/tags/apple.md>), [bgtaskscheduler](<https://devfeed.tech/tags/bgtaskscheduler.md>), [compiler](<https://devfeed.tech/tags/compiler.md>), [crashes](<https://devfeed.tech/tags/crashes.md>), [dynamic-actor-isolation](<https://devfeed.tech/tags/dynamic-actor-isolation.md>), [ios](<https://devfeed.tech/tags/ios.md>), [ios-development](<https://devfeed.tech/tags/ios-development.md>), [isolation](<https://devfeed.tech/tags/isolation.md>), [objective-c](<https://devfeed.tech/tags/objective-c.md>), [shipaton](<https://devfeed.tech/tags/shipaton.md>), [swift](<https://devfeed.tech/tags/swift.md>), [swift-6](<https://devfeed.tech/tags/swift-6.md>), [swift-concurrency](<https://devfeed.tech/tags/swift-concurrency.md>)

### AI overview

The article examines two runtime crashes caused by Swift 6 actor isolation interacting with Objective-C callbacks from BGTaskScheduler and PhotoKit. It explains why the compiler produced no warnings, how queue and isolation mismatches caused the crashes, and how the fixes were reproduced and validated.

### Source excerpt

How two Objective-C callbacks triggered Swift 6 actor-isolation crashes despite zero compiler warnings, and how the bugs were reproduced and fixed.