Using NotificationCenter's messages NSPersistentCloudKitContainer.EventChangedMessage (AsyncMessage) causes crash

Question

newwbee OP

Created 1w

Replies 4

Boosts 0

Participants 2

Overview

Using NotificationCenter's messages NSPersistentCloudKitContainer.EventChangedMessage (AsyncMessage) causes crash

When the this project is run on iOS 27 simulator, app crashes

Environment

macOS: 26.5.1 (25F80)
Xcode: Version 27.0 beta (27A5194q)
Simulator: iPhone 17 Pro
Simulator OS: iOS 27

Code causing the crash:

let messages = NotificationCenter.default.messages(
    of: NSPersistentCloudKitContainer.self,
    for: .eventChanged
)

Looks like the symbol is not even present

Feedback:

FB23220378

Logs

dyld[31078]: Symbol not found: _$sSo29NSPersistentCloudKitContainerC8CoreDataE19EventChangedMessageVSo20NSNotificationCenterC10FoundationE05AsyncI0ACMc
  Referenced from: <488D9AA6-ED4C-3189-9A08-044D576D498D> /Users/username/Library/Developer/CoreSimulator/Devices/331ADE41-8F3A-4EBE-9E3B-B335B29224D3/data/Containers/Bundle/Application/573DF3FC-E202-4D47-A85F-E5D4D1421EAC/NotificationMessageDemo.app/NotificationMessageDemo.debug.dylib
  Expected in:     <483D9879-24DB-3695-AFE5-B14E2D673F36> /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CoreData.framework/CoreData
Symbol not found: _$sSo29NSPersistentCloudKitContainerC8CoreDataE19EventChangedMessageVSo20NSNotificationCenterC10FoundationE05AsyncI0ACMc
  Referenced from: <488D9AA6-ED4C-3189-9A08-044D576D498D> /Users/username/Library/Developer/CoreSimulator/Devices/331ADE41-8F3A-4EBE-9E3B-B335B29224D3/data/Containers/Bundle/Application/573DF3FC-E202-4D47-A85F-E5D4D1421EAC/NotificationMessageDemo.app/NotificationMessageDemo.debug.dylib
  Expected in:     <483D9879-24DB-3695-AFE5-B14E2D673F36> /private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks/CoreData.framework/CoreData
dyld config: DYLD_SHARED_CACHE_DIR=/Library/Developer/CoreSimulator/Caches/dyld/25F80/com.apple.CoreSimulator.SimRuntime.iOS-27-0.24A5355p/ DYLD_ROOT_PATH=/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot DYLD_LIBRARY_PATH=/Users/username/Library/Developer/Xcode/DerivedData/NotificationMessageDemo-gungjtytarzeijdspglltylscocj/Build/Products/Debug-iphonesimulator DYLD_INSERT_LIBRARIES=/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libLogRedirect.dylib:/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libMainThreadChecker.dylib:/usr/lib/libRPAC.dylib:/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/usr/lib/libViewDebuggerSupport.dylib DYLD_FRAMEWORK_PATH=/Users/username/Library/Developer/Xcode/DerivedData/NotificationMessageDemo-gungjtytarzeijdspglltylscocj/Build/Products/Debug-iphonesimulator DYLD_FALLBACK_FRAMEWORK_PATH=/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/System/Library/Frameworks DYLD_FALLBACK_LIBRARY_PATH=/private/var/run/com.apple.security.cryptexd/mnt/com.apple.iPhoneOS.SimulatorRuntime-v24.1.5355.16.mnzElK/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS 27.0.simruntime/Contents/Resources/RuntimeRoot/usr/lib
Debug session ended with code 9: killed

Answered by DTS Engineer in 894419022

FB23220378

Thanks for that. Filing a bug is definitely the right path for an issue like this one, where something introduced in the iOS 27 beta SDK is failing on the iOS 27 beta simulator.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 1

DTS Engineer OP

Apple

1w

Recommended

FB23220378

Thanks for that. Filing a bug is definitely the right path for an issue like this one, where something introduced in the iOS 27 beta SDK is failing on the iOS 27 beta simulator.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 2

newwbee OP

1w

@DTS Engineer Thanks a lot Quinn, fingers crossed hope it gets fixed.

@DTS Engineer on a completely different note would you know of any documentation for these predefined messages?

Like for example the following doesn't even compile is this me using the API incorrectly or a another bug?

Code (doesn't compile):

let m2 = NotificationCenter.default.messages(
            of: UIDevice.self,
            for: .batteryStateDidChange
        )

Error:

No exact matches in call to instance method 'messages'

Answer 3

DTS Engineer OP

Apple

1w

Like for example the following doesn't even compile … ?

Yeah, that’s confusing. UIDevice.BatteryStateDidChangeMessage conforms to NotificationCenter.MainActorMessage, not to NotificationCenter.AsyncMessage. Given that, you observe it on the main actor like so:

let t = NotificationCenter.default.addObserver(of: UIDevice.self, for: .batteryStateDidChange) { message in
    …
}

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@" + "apple.com"

Answer 4

newwbee OP

1w

@DTS Engineer Quinn spot on!!

Thanks a ton for that clarification! I was breaking my head over it.