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VisionKit - crash after photo taken in VNDocumentCameraViewController in iOS 26 when Liquid Glass enabled
I'm adopting Liquid Glass in iOS 26, when I try to test VNDocumentCameraViewController with document scanning after Liquid Glass enabled, there's a crash just after a photo is taken in VNDocumentCameraViewController, here's the screenshot when it crashed The exception output in XCode console is this: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Layout requested for visible navigation bar, > standardAppearance=0x12407b900 scrollEdgeAppearance=0x12407bb80 compactAppearance=0x12407b880 no-scroll-edge-support, when the top item belongs to a different navigation bar. topItem = style=navigator leftBarButtonItems=0x123d4e5f0 rightBarButtonItems=0x123d4d5a0, navigation bar = > delegate=0x10a805200 standardAppearance=0x107b2c300 scrollEdgeAppearance=0x107b2c280 compactAppearance=0x107b2c100, possibly from a client attempt to nest wrapped navigation controllers.' *** First throw call stack: (0x18e1db994 0x18b0f5814 0x18c092aa0 0x193b18660 0x193a7d54
1
0
491
Jan ’26
Crash in URLConnectionLoader::loadWithWhatToDo
There are multiple report of crashes on URLConnectionLoader::loadWithWhatToDo. The crashed thread in the stack traces pointing to calls inside CFNetwork which seems to be internal library in iOS. The crash has happened quite a while already (but we cannot detect when the crash started to occur) and impacted multiple iOS versions recorded from iOS 15.4 to 18.4.1 that was recorded in Xcode crash report organizer so far. Unfortunately, we have no idea on how to reproduce it yet but the crash keeps on increasing and affect more on iOS 18 users (which makes sense because many people updated their iOS to the newer version) and we haven’t found any clue on what actually happened and how to fix it on the crash reports. What we understand is it seems to come from a network request that happened to trigger the crash but we need more information on what (condition) actually cause it and how to solve it. Hereby, I attach sample crash report
10
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704
Jan ’26
Keyframe animation crashes with +[_SwiftUILayerDelegate _screen]: unrecognized selector sent to class on iOS 26
We have an UIViewController called InfoPlayerViewController. Its main subview is from a child view controller backed by SwiftUI via UIHostingController. The InfoPlayerViewController conforms to UIViewControllerTransitioningDelegate. The animation controller for dismissing is DismissPlayerAnimationController. It runs UIKit keyframe animations via UIViewPropertyAnimator. When the keyframe animation is executed there’s an occasional crash for end users in production. It only happens on iOS 26. FB Radar: FB20871547 An example crash is below. Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Reason: +[_SwiftUILayerDelegate _screen]: unrecognized selector sent to class 0x20c95da08 Termination Reason: SIGNAL 6 Abort trap: 6 Triggered by Thread: 0 Last Exception Backtrace: 0 CoreFoundation 0x1a23828c8 __exceptionPreprocess + 164 (NSException.m:249) 1 libobjc.A.dylib 0x19f2f97c4 objc_exception_throw + 88 (objc-exception.mm:356) 2 CoreFoundation 0x1a
4
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623
Jan ’26
iOS 26 + UINavigationBar crash in layoutSubViews - new observation tracking
My #1 crash report since iOS 26 is the following: 1 libobjc.A.dylib objc_exception_throw 2 Foundation -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] 3 UIKitCore -[UINavigationBar layoutSubviews] 4 UIKitCore UIView._layoutSubviewsWithObservationTracking() 5 UIKitCore @objc UIView._layoutSubviewsWithObservationTracking() Thread 0 9 libobjc.A.dylib objc_exception_throw 10 Foundation -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] 11 UIKitCore -[UINavigationBar layoutSubviews] 12 UIKitCore UIView._layoutSubviewsWithObservationTracking() 13 UIKitCore @objc UIView._layoutSubviewsWithObservationTracking() I tried many things, without success so far. It seemed related to the new view update with observation tracking: link to documentation Any lead on how I should investigate this? Many thanks in advance!!
Topic: UI Frameworks SubTopic: UIKit Tags:
1
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462
Jan ’26
Threading issues when using debugger
Hi, I am modifying the sample camera app that is here: https://developer.apple.com/tutorials/sample-apps/capturingphotos-camerapreview ... In the processPreviewImages, I am using the Vision APIs to generate a segmentation mask for a person/object, then compositing that person onto a different background (with some other filtering). The filtering and compositing is done via CoreImage. At the end, I convert the CIImage to a CGImage then to a SwiftUI Image. When I run it on my iPhone, it works fine, and has not crashed. When I run it on the iPhone with the debugger, it crashes within a few seconds with: EXC_BAD_ACCESS in libRPAC.dylib`std::__1::__hash_table, std::__1::__unordered_map_hasher, std::__1::hash, std::__1::equal_to, true>, std::__1::__unordered_map_equal, std::__1::equal_to, std::__1::hash, true>, std::__1::allocator>>::__emplace_unique_key_args, std::__1::tuple<>>: It had previously been working fine with the debugger, so I'm not sure what has changed. Is there
1
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413
Jan ’26
My app crashes on startup in iOS 26
I have an app with a small but devoted following. It has not been upgraded since 2022 and has been working very well. On iOS 26 it crashes almost at startup. After hooking up to Xcode and running I get this message in the console: objc[64686]: Class PSSegment is implemented in both /System/Library/PrivateFrameworks/PolarisGraph.framework/PolarisGraph (0x291ed9f78) and /private/var/containers/Bundle/Application/08486FCF-548A-467C-8BA3-D722734463FC/HikeTracker.app/HikeTracker.debug.dylib (0x101d309e8). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed. PSSegment is the name of an entity in my Core Data managed object model. If I refactor it to P_Segment the app starts. PolarisGraph means nothing to me. The PS stands for Persistent Store, but in this case it seems that PolarisGraph is PSing in my sandbox. How can this happen? I'll attach the longer message that comes with the crash. error messages.txt
2
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478
Jan ’26
Swift Playgrounds macOS repeatedly asks “My App would like to access data from other apps”
Environment: Swift Playgrounds (macOS) SwiftUI App Preview macOS version: 26.2 (25C56) Issue: In Swift Playgrounds on macOS, the app repeatedly shows the system permission dialog: “My App would like to access data from other apps. Keeping app data separate makes it easier to manage your privacy and security.” Steps to Reproduce: Create a new SwiftUI app in Swift Playgrounds. Run the SwiftUI App Preview. When the permission dialog appears, click “Allow”. Expected Result: The permission should be granted once and persist, allowing the preview to continue normally. Actual Result: After clicking “Allow”, the SwiftUI App Preview crashes and restarts. When the preview restarts, the same permission dialog appears again. This repeats indefinitely, creating a loop. Notes: This occurs even when no explicit file system or inter-app data access code is written. The permission choice does not appear to persist between preview restarts. Question: Is this a known limitation of Swift Playgrounds sandboxing or SwiftU
2
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452
Jan ’26
Post-iOS update crash on app launch with split/black screen (Flutter + WebView)
Hi all. Thanks in advance for any guidance you’re able to offer. We’ve had an issue reported by multiple customers where, following an iOS update, our app crashes on the next launch. When this happens, users briefly see a split screen: half of the view shows the app background, while the other half is completely black. After this point, the app is unusable. Here’s what we’ve uncovered so far during our investigation: We believe this occurs when a user is already signed into the app at the time they install the iOS update. For context, we intentionally do not force users to log out of the app, as it’s primarily used for customer support and assistance. This is a firm business decision and not something we plan to change. We suspect the issue is related to our Flutter WebView and how it restores or reloads session state following an iOS update. In the past, updating the Flutter version has resolved similar issues, but we are currently on the latest available version. Once the half-screen issue occurs,
1
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121
Jan ’26
Reply to Xcode 26 can no longer launch, and crashes immediately
Hi, there. Sorry you're dealing with this. We're aware of the issue and you can expect a broad fix to make its way into an Xcode near you soon. In the meantime, you can resolve this by removing the local user state for your Xcode Project or Workspace: Quit Xcode (if it's still running, or if another workspace is open). In Finder, find your .xcodeproj file Right-click it > Show Package Contents Navigate to: {project}.xcworkspace → xcuserdata Delete the xcuserdata folder Once you relaunch Xcode, you may need to recreate any user-local state for your project or workspace, but the crash will be gone and you will be able to keep working. Please follow up if you have any further difficulties. Thanks.
Jan ’26
Xcode 26 can no longer launch, and crashes immediately
Each time I try to launch Xcode 26, it immediately crashes in SourceEditorDataSource.ideChat_gracefullyApplyChangesToReflect. I'm now no longer able to use Xcode. A partial crash log attached. So far I've tried deleting derived data, rebooting, deleting ~/Library/Caches/com.apple.dt.Xcode. What should I do? Thank you in advance for any help. crash-report.txt
1
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284
Jan ’26
VisionKit - crash after photo taken in VNDocumentCameraViewController in iOS 26 when Liquid Glass enabled
I'm adopting Liquid Glass in iOS 26, when I try to test VNDocumentCameraViewController with document scanning after Liquid Glass enabled, there's a crash just after a photo is taken in VNDocumentCameraViewController, here's the screenshot when it crashed The exception output in XCode console is this: *** Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Layout requested for visible navigation bar, > standardAppearance=0x12407b900 scrollEdgeAppearance=0x12407bb80 compactAppearance=0x12407b880 no-scroll-edge-support, when the top item belongs to a different navigation bar. topItem = style=navigator leftBarButtonItems=0x123d4e5f0 rightBarButtonItems=0x123d4d5a0, navigation bar = > delegate=0x10a805200 standardAppearance=0x107b2c300 scrollEdgeAppearance=0x107b2c280 compactAppearance=0x107b2c100, possibly from a client attempt to nest wrapped navigation controllers.' *** First throw call stack: (0x18e1db994 0x18b0f5814 0x18c092aa0 0x193b18660 0x193a7d54
Replies
1
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0
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491
Activity
Jan ’26
Crash in URLConnectionLoader::loadWithWhatToDo
There are multiple report of crashes on URLConnectionLoader::loadWithWhatToDo. The crashed thread in the stack traces pointing to calls inside CFNetwork which seems to be internal library in iOS. The crash has happened quite a while already (but we cannot detect when the crash started to occur) and impacted multiple iOS versions recorded from iOS 15.4 to 18.4.1 that was recorded in Xcode crash report organizer so far. Unfortunately, we have no idea on how to reproduce it yet but the crash keeps on increasing and affect more on iOS 18 users (which makes sense because many people updated their iOS to the newer version) and we haven’t found any clue on what actually happened and how to fix it on the crash reports. What we understand is it seems to come from a network request that happened to trigger the crash but we need more information on what (condition) actually cause it and how to solve it. Hereby, I attach sample crash report
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10
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0
Views
704
Activity
Jan ’26
Keyframe animation crashes with +[_SwiftUILayerDelegate _screen]: unrecognized selector sent to class on iOS 26
We have an UIViewController called InfoPlayerViewController. Its main subview is from a child view controller backed by SwiftUI via UIHostingController. The InfoPlayerViewController conforms to UIViewControllerTransitioningDelegate. The animation controller for dismissing is DismissPlayerAnimationController. It runs UIKit keyframe animations via UIViewPropertyAnimator. When the keyframe animation is executed there’s an occasional crash for end users in production. It only happens on iOS 26. FB Radar: FB20871547 An example crash is below. Exception Type: EXC_CRASH (SIGABRT) Exception Codes: 0x0000000000000000, 0x0000000000000000 Exception Reason: +[_SwiftUILayerDelegate _screen]: unrecognized selector sent to class 0x20c95da08 Termination Reason: SIGNAL 6 Abort trap: 6 Triggered by Thread: 0 Last Exception Backtrace: 0 CoreFoundation 0x1a23828c8 __exceptionPreprocess + 164 (NSException.m:249) 1 libobjc.A.dylib 0x19f2f97c4 objc_exception_throw + 88 (objc-exception.mm:356) 2 CoreFoundation 0x1a
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4
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0
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623
Activity
Jan ’26
Motiv Audio app crashes while opening Motiv Video app
Install both Motiv Audio and Motiv Video apps from the App Store. Open and use the Motiv Audio app. Remove audio app from background. Open Motiv Video app. Observe that the Motiv Audio app crashes. Both apps are checking Free available space. Both app are using Audio Engine
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1
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0
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69
Activity
Jan ’26
iOS 26 + UINavigationBar crash in layoutSubViews - new observation tracking
My #1 crash report since iOS 26 is the following: 1 libobjc.A.dylib objc_exception_throw 2 Foundation -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] 3 UIKitCore -[UINavigationBar layoutSubviews] 4 UIKitCore UIView._layoutSubviewsWithObservationTracking() 5 UIKitCore @objc UIView._layoutSubviewsWithObservationTracking() Thread 0 9 libobjc.A.dylib objc_exception_throw 10 Foundation -[NSAssertionHandler handleFailureInMethod:object:file:lineNumber:description:] 11 UIKitCore -[UINavigationBar layoutSubviews] 12 UIKitCore UIView._layoutSubviewsWithObservationTracking() 13 UIKitCore @objc UIView._layoutSubviewsWithObservationTracking() I tried many things, without success so far. It seemed related to the new view update with observation tracking: link to documentation Any lead on how I should investigate this? Many thanks in advance!!
Topic: UI Frameworks SubTopic: UIKit Tags:
Replies
1
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0
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462
Activity
Jan ’26
Threading issues when using debugger
Hi, I am modifying the sample camera app that is here: https://developer.apple.com/tutorials/sample-apps/capturingphotos-camerapreview ... In the processPreviewImages, I am using the Vision APIs to generate a segmentation mask for a person/object, then compositing that person onto a different background (with some other filtering). The filtering and compositing is done via CoreImage. At the end, I convert the CIImage to a CGImage then to a SwiftUI Image. When I run it on my iPhone, it works fine, and has not crashed. When I run it on the iPhone with the debugger, it crashes within a few seconds with: EXC_BAD_ACCESS in libRPAC.dylib`std::__1::__hash_table, std::__1::__unordered_map_hasher, std::__1::hash, std::__1::equal_to, true>, std::__1::__unordered_map_equal, std::__1::equal_to, std::__1::hash, true>, std::__1::allocator>>::__emplace_unique_key_args, std::__1::tuple<>>: It had previously been working fine with the debugger, so I'm not sure what has changed. Is there
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1
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0
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413
Activity
Jan ’26
Reply to Threading issues when using debugger
We are seeing the same in a SwiftUI runtime. Completely new crash. What version are you running?
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Jan ’26
My app crashes on startup in iOS 26
I have an app with a small but devoted following. It has not been upgraded since 2022 and has been working very well. On iOS 26 it crashes almost at startup. After hooking up to Xcode and running I get this message in the console: objc[64686]: Class PSSegment is implemented in both /System/Library/PrivateFrameworks/PolarisGraph.framework/PolarisGraph (0x291ed9f78) and /private/var/containers/Bundle/Application/08486FCF-548A-467C-8BA3-D722734463FC/HikeTracker.app/HikeTracker.debug.dylib (0x101d309e8). This may cause spurious casting failures and mysterious crashes. One of the duplicates must be removed or renamed. PSSegment is the name of an entity in my Core Data managed object model. If I refactor it to P_Segment the app starts. PolarisGraph means nothing to me. The PS stands for Persistent Store, but in this case it seems that PolarisGraph is PSing in my sandbox. How can this happen? I'll attach the longer message that comes with the crash. error messages.txt
Replies
2
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0
Views
478
Activity
Jan ’26
Reply to Xcode Crashes when viewing XCUITest Result
Hi Kenny, There should be a file in ~/Library/Logs/DiagnosticReports/ that is named something like Xcode-$timestamp.ips - if you can share that then I can check to see if there are known workarounds. Also have you/can you submit a Feedback item with the details of the crash?
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Jan ’26
Reply to macOS 26: NSTokenField crashes due to NSGenericException caused by too many Update Constraints
No reply from Apple and no similar reports in the Feedback app, as usual. I also gave up on updating my feedback with each beta, it's just too frustrating. Instead, I rewrote everything to use strings instead of a custom token type. It requires more parsing passes, but it doesn't crash. Hope this path is also an option for you!
Topic: UI Frameworks SubTopic: AppKit Tags:
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Jan ’26
Swift Playgrounds macOS repeatedly asks “My App would like to access data from other apps”
Environment: Swift Playgrounds (macOS) SwiftUI App Preview macOS version: 26.2 (25C56) Issue: In Swift Playgrounds on macOS, the app repeatedly shows the system permission dialog: “My App would like to access data from other apps. Keeping app data separate makes it easier to manage your privacy and security.” Steps to Reproduce: Create a new SwiftUI app in Swift Playgrounds. Run the SwiftUI App Preview. When the permission dialog appears, click “Allow”. Expected Result: The permission should be granted once and persist, allowing the preview to continue normally. Actual Result: After clicking “Allow”, the SwiftUI App Preview crashes and restarts. When the preview restarts, the same permission dialog appears again. This repeats indefinitely, creating a loop. Notes: This occurs even when no explicit file system or inter-app data access code is written. The permission choice does not appear to persist between preview restarts. Question: Is this a known limitation of Swift Playgrounds sandboxing or SwiftU
Replies
2
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0
Views
452
Activity
Jan ’26
Post-iOS update crash on app launch with split/black screen (Flutter + WebView)
Hi all. Thanks in advance for any guidance you’re able to offer. We’ve had an issue reported by multiple customers where, following an iOS update, our app crashes on the next launch. When this happens, users briefly see a split screen: half of the view shows the app background, while the other half is completely black. After this point, the app is unusable. Here’s what we’ve uncovered so far during our investigation: We believe this occurs when a user is already signed into the app at the time they install the iOS update. For context, we intentionally do not force users to log out of the app, as it’s primarily used for customer support and assistance. This is a firm business decision and not something we plan to change. We suspect the issue is related to our Flutter WebView and how it restores or reloads session state following an iOS update. In the past, updating the Flutter version has resolved similar issues, but we are currently on the latest available version. Once the half-screen issue occurs,
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1
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0
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121
Activity
Jan ’26
Reply to Post-iOS update crash on app launch with split/black screen (Flutter + WebView)
Does this crash generate a crash report? If so, please post an example. See Posting a Crash Report for advice on how to do that. Share and Enjoy — Quinn “The Eskimo!” @ Developer Technical Support @ Apple let myEmail = eskimo + 1 + @ + apple.com
Topic: App & System Services SubTopic: General Tags:
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Jan ’26
Reply to Xcode 26 can no longer launch, and crashes immediately
Hi, there. Sorry you're dealing with this. We're aware of the issue and you can expect a broad fix to make its way into an Xcode near you soon. In the meantime, you can resolve this by removing the local user state for your Xcode Project or Workspace: Quit Xcode (if it's still running, or if another workspace is open). In Finder, find your .xcodeproj file Right-click it > Show Package Contents Navigate to: {project}.xcworkspace → xcuserdata Delete the xcuserdata folder Once you relaunch Xcode, you may need to recreate any user-local state for your project or workspace, but the crash will be gone and you will be able to keep working. Please follow up if you have any further difficulties. Thanks.
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Jan ’26
Xcode 26 can no longer launch, and crashes immediately
Each time I try to launch Xcode 26, it immediately crashes in SourceEditorDataSource.ideChat_gracefullyApplyChangesToReflect. I'm now no longer able to use Xcode. A partial crash log attached. So far I've tried deleting derived data, rebooting, deleting ~/Library/Caches/com.apple.dt.Xcode. What should I do? Thank you in advance for any help. crash-report.txt
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1
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0
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284
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Jan ’26