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Reply to How to debug a Launch Daemon that requires an App Group provisioning profile for XPC communication
[quote='821027021, Pavel, /thread/821027, /profile/Pavel'] For debugging purposes, I am trying to run the daemon's executable directly from the terminal [/quote] This won’t work. For your launchd daemon to work correctly, it must be started by launchd. I explain why that’s the case in XPC and App-to-App Communication. My general advice for debugging a launchd daemon is: Structure your code so that you can do most of your debugging in unit tests, rather than in your daemon. That’ll make your life much easier. To unit test your XPC code, use the technique in TN3113 Testing and debugging XPC code with an anonymous listener. To debug integration issues: Using LLDB’s --wait-for option to attach to the daemon shortly after it starts. There’s a similar option in Xcode, under Debug > Attach to Process by PID or Name. Or if you absolutely need to debug from the first instruction, add the WaitForDebugger property to your launchd property list. See the launchd.plist man page for details. [quote='821027021, P
Topic: App & System Services SubTopic: Processes & Concurrency Tags:
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AccessoryTransport Extensions not launching on iOS 26.5 beta — missing entitlements not available in provisioning
Environment Xcode 26.5 beta iOS 26.5 beta Using AccessorySetupKit + AccessoryTransportExtension framework Three extensions: AccessoryTransportAppExtension, AccessoryTransportSecurityExtension, AccessoryDataProviderExtension Background Everything worked correctly on iOS 26.4 beta. All three extensions shared the entitlement com.apple.developer.accessory-transport-extension, and the system launched them as expected. After upgrading to iOS 26.5 beta (both Xcode and device), the app compiles and runs, the accessory pairs and connects successfully (state = authorized, BLE connected, notification forwarding = allow), but none of the extensions are launched by the system. Investigation Captured system Console logs from the device and found these errors from deviceaccessd: error deviceaccessd ### Extension 'com.huami.NotificationForwardingDemo.AccessoryDataProviderExtension' is missing entitlement: com.apple.developer.accessory-data-provider for com.apple.accessory-data-provider error deviceaccessd
Topic: App & System Services SubTopic: Widgets & Live Activities Tags:
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Github repository issues, no branches showing
I added a workflow and it seemed to work fine so lets add them all ! I added a second workflow and it seems to see the repository but not the branches in the repository. I have googled and even asked AI. Checked and it's installed with all repo access on Github Removing the repo .. adding it back Deleting the workflow and adding it back Adding the workflow from the browser Adding the workflow from XCode Nothing seems to work, but the first one I created works. Is there paid support for Xcode Cloud ? I s there a version control that works better with Xcode Cloud? Any suggestions are appreciated.
Topic: Developer Tools & Services SubTopic: Xcode Cloud Tags:
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Reply to Need MetricKit Implementation details for MacOS background Application, mainly for
Also one more point, when i integrated metric Kit and used Xcode to simulate MetricKit payloads, i was getting the callback i.e func didReceive(_ payloads: [MXMetricPayload]) Main issue was that when i launched my app with changes and waited for more than 24 hours, but i did not get any callback, so wanted to know if it works on background apps or not? Also does it work on MacOS or not? Could u pls help to answer it
Topic: Developer Tools & Services SubTopic: General Tags:
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About Customizing Xcode Project Navigator UI
Since I have downloaded latest Xcode version I am having Project Navigator in the Menu Style UI and not in the Tab based UI, the one earlier. Also, I am not able to find any options to change Project Navigator style. Please provide user the option to change UI to either Menu based or Tab based Project Navigator UI ( Projects, Source Control, Bookmark, find etc )
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Are there known issues with aggressive optimization (-O) affecting third-party libraries?
We are encountering an issue in an iOS application where functionality works correctly in Debug builds but fails in Release builds distributed via TestFlight. Details Debug (No Optimization -Onone): Works correctly Release (Optimize for Speed -O): Fails Release with -Onone: Works, but app size nearly doubles Context The issue is related to integration with the Microsoft ONNX runtime library. It appears that the Swift/Clang compiler is aggressively optimizing certain parts of the code in Release builds, possibly removing or altering required logic. Observations The issue started appearing with recent iOS/Xcode updates. No code changes affecting this logic were made recently. Behavior strongly suggests optimization-related side effects. Questions Are there known issues with aggressive optimization (-O) affecting third-party libraries? Are there recommended flags to selectively disable optimization for specific modules or functions? Any tools or diagnostics to identify what is being optimized out? Tempo
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Reply to Background Assets - Apple Hosted - iOS26
Hello, @andy_nash, @StonedStudio, @tom_krikorian, @Dokug, and @zepsec! I’m happy to report that this issue is now resolved in the OS 26.5 beta 1 simulators that we released today with Xcode 26.5 beta 1. If you still see crashes or errors that mention a “team ID” after updating to the OS 26.5 beta 1 simulators, then please file a new feedback report and reply to this thread with the feedback ID. Note that there’s still a separate known issue that prevents the URL override from working in simulator environments. I’ll post again in this thread when that separate issue is fixed. Thanks!
Topic: App Store Distribution & Marketing SubTopic: General Tags:
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Reply to Xcode 26.4 rc
I'm seeing the same issue in Xcode 26.4 release. Failed to authenticate. API Error: 401 {type:error,error:{type:authentication_error,message:OAuth token has expired. Please obtain a new token or refresh your existing token.},request_id:req_011CZaDXn4KLC1KJ3SsLdBwC} This is happening for Claude Agent within Xcode and the only way I can fix it is to log out of Claude and then log back in. Very frustrating.
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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Reply to Different app behavior when running on device from Xcode
Thank you @Tomato and @DTS Engineer ! The purpose of my app is to provide a notification mechanism when there are drastic air quality changes. To accomplish this, I have an async function that makes a GET request to an air quality sensor (using UrlSession), decode the payload, and then do comparisons with previous readings. If the readings have changed drastically, an UNMutableNotificationContent() is scheduled. Currently, my async function is called from within a repeating scheduled timer so that I can poll my sensor every minute: Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in timerVal -= 1 if timerVal == 0 { timerVal = startVal getAQI() } } This all works just fine (including when the app is in the background) ONLY when I run the app from Build and Run in Xcode on my dev iPhone as the destination. I've left the app running this way for hours in the background and with the phone locked and it works great! However, when I try to run the app purely from the app shortcut on my iPhone
Topic: Community SubTopic: Apple Developers Tags:
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Simulator fails to boot
Im working on my laptop with Mac OS 15.7.5 and Im using Xcode 26.0.1 and Im trying to simulate the code I've written. It only allows me to simulate on iPhone 16e but it never finishes loading, I also tried using my personal iPhone as a simulator but that doesn't work either. Could it possibly be my storage on why the simulators don't work?
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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CoreML MLE5ProgramLibrary AOT recompilation hangs/crashes on iOS 26.4 — C++ exception in espresso IR compiler bypasses Swift error handling
Area: CoreML / Machine Learning Describe the issue: On iOS 26.4, calling MLModel(contentsOf:configuration:) to load an .mlpackage model hangs indefinitely and eventually kills the app via watchdog. The same model loads and runs inference successfully in under 1 second on iOS 26.3.1. The hang occurs inside eort_eo_compiler_compile_from_ir_program (espresso) during on-device AOT recompilation triggered by MLE5ProgramLibraryOnDeviceAOTCompilationImpl createProgramLibraryHandleWithRespecialization:error:. A C++ exception (__cxa_throw) is thrown inside libBNNS.dylib during the exception unwind, which then hangs inside __cxxabiv1::dyn_cast_slow and __class_type_info::search_below_dst. Swift's try/catch does not catch this — the exception originates in C++ and the process hangs rather than terminating cleanly. Setting config.computeUnits = .cpuOnly does not resolve the issue. MLE5ProgramLibrary initialises as shared infrastructure regardless of compute units. Steps to reproduce: Create an app with an .mlpackage Core
Topic: Machine Learning & AI SubTopic: Core ML Tags:
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Reply to How to debug a Launch Daemon that requires an App Group provisioning profile for XPC communication
[quote='821027021, Pavel, /thread/821027, /profile/Pavel'] For debugging purposes, I am trying to run the daemon's executable directly from the terminal [/quote] This won’t work. For your launchd daemon to work correctly, it must be started by launchd. I explain why that’s the case in XPC and App-to-App Communication. My general advice for debugging a launchd daemon is: Structure your code so that you can do most of your debugging in unit tests, rather than in your daemon. That’ll make your life much easier. To unit test your XPC code, use the technique in TN3113 Testing and debugging XPC code with an anonymous listener. To debug integration issues: Using LLDB’s --wait-for option to attach to the daemon shortly after it starts. There’s a similar option in Xcode, under Debug > Attach to Process by PID or Name. Or if you absolutely need to debug from the first instruction, add the WaitForDebugger property to your launchd property list. See the launchd.plist man page for details. [quote='821027021, P
Topic: App & System Services SubTopic: Processes & Concurrency Tags:
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Reply to ‌Xcode26-built apps cannot run on iPhone 6 or earlier devices‌
Not just Xcode 26 — re-releasing with an older version of Xcode has the same issue. For users on iOS 12 and below, the app can no longer launch.
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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AccessoryTransport Extensions not launching on iOS 26.5 beta — missing entitlements not available in provisioning
Environment Xcode 26.5 beta iOS 26.5 beta Using AccessorySetupKit + AccessoryTransportExtension framework Three extensions: AccessoryTransportAppExtension, AccessoryTransportSecurityExtension, AccessoryDataProviderExtension Background Everything worked correctly on iOS 26.4 beta. All three extensions shared the entitlement com.apple.developer.accessory-transport-extension, and the system launched them as expected. After upgrading to iOS 26.5 beta (both Xcode and device), the app compiles and runs, the accessory pairs and connects successfully (state = authorized, BLE connected, notification forwarding = allow), but none of the extensions are launched by the system. Investigation Captured system Console logs from the device and found these errors from deviceaccessd: error deviceaccessd ### Extension 'com.huami.NotificationForwardingDemo.AccessoryDataProviderExtension' is missing entitlement: com.apple.developer.accessory-data-provider for com.apple.accessory-data-provider error deviceaccessd
Topic: App & System Services SubTopic: Widgets & Live Activities Tags:
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1
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38
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Github repository issues, no branches showing
I added a workflow and it seemed to work fine so lets add them all ! I added a second workflow and it seems to see the repository but not the branches in the repository. I have googled and even asked AI. Checked and it's installed with all repo access on Github Removing the repo .. adding it back Deleting the workflow and adding it back Adding the workflow from the browser Adding the workflow from XCode Nothing seems to work, but the first one I created works. Is there paid support for Xcode Cloud ? I s there a version control that works better with Xcode Cloud? Any suggestions are appreciated.
Topic: Developer Tools & Services SubTopic: Xcode Cloud Tags:
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13
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Reply to Apps cannot launch on iOS 9-12 devices after recent build - "The process failed to exec"
The same codebase previously ran fine when uploaded to TestFlight, but after re-uploading it now fails to launch on iOS 12, even though neither the code nor the Xcode version has changed. I suspect a recent change in the App Store Connect backend processing pipeline is the cause.
Topic: App Store Distribution & Marketing SubTopic: App Store Connect
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Reply to Need MetricKit Implementation details for MacOS background Application, mainly for
Also one more point, when i integrated metric Kit and used Xcode to simulate MetricKit payloads, i was getting the callback i.e func didReceive(_ payloads: [MXMetricPayload]) Main issue was that when i launched my app with changes and waited for more than 24 hours, but i did not get any callback, so wanted to know if it works on background apps or not? Also does it work on MacOS or not? Could u pls help to answer it
Topic: Developer Tools & Services SubTopic: General Tags:
Replies
Boosts
Views
Activity
1d
About Customizing Xcode Project Navigator UI
Since I have downloaded latest Xcode version I am having Project Navigator in the Menu Style UI and not in the Tab based UI, the one earlier. Also, I am not able to find any options to change Project Navigator style. Please provide user the option to change UI to either Menu based or Tab based Project Navigator UI ( Projects, Source Control, Bookmark, find etc )
Topic: Developer Tools & Services SubTopic: Xcode Tags:
Replies
2
Boosts
0
Views
205
Activity
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Are there known issues with aggressive optimization (-O) affecting third-party libraries?
We are encountering an issue in an iOS application where functionality works correctly in Debug builds but fails in Release builds distributed via TestFlight. Details Debug (No Optimization -Onone): Works correctly Release (Optimize for Speed -O): Fails Release with -Onone: Works, but app size nearly doubles Context The issue is related to integration with the Microsoft ONNX runtime library. It appears that the Swift/Clang compiler is aggressively optimizing certain parts of the code in Release builds, possibly removing or altering required logic. Observations The issue started appearing with recent iOS/Xcode updates. No code changes affecting this logic were made recently. Behavior strongly suggests optimization-related side effects. Questions Are there known issues with aggressive optimization (-O) affecting third-party libraries? Are there recommended flags to selectively disable optimization for specific modules or functions? Any tools or diagnostics to identify what is being optimized out? Tempo
Topic: Developer Tools & Services SubTopic: Xcode Tags:
Replies
2
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0
Views
75
Activity
1d
Reply to Background Assets - Apple Hosted - iOS26
Hello, @andy_nash, @StonedStudio, @tom_krikorian, @Dokug, and @zepsec! I’m happy to report that this issue is now resolved in the OS 26.5 beta 1 simulators that we released today with Xcode 26.5 beta 1. If you still see crashes or errors that mention a “team ID” after updating to the OS 26.5 beta 1 simulators, then please file a new feedback report and reply to this thread with the feedback ID. Note that there’s still a separate known issue that prevents the URL override from working in simulator environments. I’ll post again in this thread when that separate issue is fixed. Thanks!
Topic: App Store Distribution & Marketing SubTopic: General Tags:
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1d
Reply to Xcode 26.4 rc
I'm seeing the same issue in Xcode 26.4 release. Failed to authenticate. API Error: 401 {type:error,error:{type:authentication_error,message:OAuth token has expired. Please obtain a new token or refresh your existing token.},request_id:req_011CZaDXn4KLC1KJ3SsLdBwC} This is happening for Claude Agent within Xcode and the only way I can fix it is to log out of Claude and then log back in. Very frustrating.
Topic: Developer Tools & Services SubTopic: Xcode Tags:
Replies
Boosts
Views
Activity
1d
Reply to Different app behavior when running on device from Xcode
Thank you @Tomato and @DTS Engineer ! The purpose of my app is to provide a notification mechanism when there are drastic air quality changes. To accomplish this, I have an async function that makes a GET request to an air quality sensor (using UrlSession), decode the payload, and then do comparisons with previous readings. If the readings have changed drastically, an UNMutableNotificationContent() is scheduled. Currently, my async function is called from within a repeating scheduled timer so that I can poll my sensor every minute: Timer.scheduledTimer(withTimeInterval: 1.0, repeats: true) { _ in timerVal -= 1 if timerVal == 0 { timerVal = startVal getAQI() } } This all works just fine (including when the app is in the background) ONLY when I run the app from Build and Run in Xcode on my dev iPhone as the destination. I've left the app running this way for hours in the background and with the phone locked and it works great! However, when I try to run the app purely from the app shortcut on my iPhone
Topic: Community SubTopic: Apple Developers Tags:
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Views
Activity
1d
Simulator fails to boot
Im working on my laptop with Mac OS 15.7.5 and Im using Xcode 26.0.1 and Im trying to simulate the code I've written. It only allows me to simulate on iPhone 16e but it never finishes loading, I also tried using my personal iPhone as a simulator but that doesn't work either. Could it possibly be my storage on why the simulators don't work?
Topic: Developer Tools & Services SubTopic: Xcode Tags:
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0
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0
Views
28
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Reply to Installation of XCode CLT on Tahoe 26.1
It turned out to be a Mac OS version compatibility issue. I needed to upgrade to 26.2 or higher to install XCode CLT
Topic: Developer Tools & Services SubTopic: Xcode
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CoreML MLE5ProgramLibrary AOT recompilation hangs/crashes on iOS 26.4 — C++ exception in espresso IR compiler bypasses Swift error handling
Area: CoreML / Machine Learning Describe the issue: On iOS 26.4, calling MLModel(contentsOf:configuration:) to load an .mlpackage model hangs indefinitely and eventually kills the app via watchdog. The same model loads and runs inference successfully in under 1 second on iOS 26.3.1. The hang occurs inside eort_eo_compiler_compile_from_ir_program (espresso) during on-device AOT recompilation triggered by MLE5ProgramLibraryOnDeviceAOTCompilationImpl createProgramLibraryHandleWithRespecialization:error:. A C++ exception (__cxa_throw) is thrown inside libBNNS.dylib during the exception unwind, which then hangs inside __cxxabiv1::dyn_cast_slow and __class_type_info::search_below_dst. Swift's try/catch does not catch this — the exception originates in C++ and the process hangs rather than terminating cleanly. Setting config.computeUnits = .cpuOnly does not resolve the issue. MLE5ProgramLibrary initialises as shared infrastructure regardless of compute units. Steps to reproduce: Create an app with an .mlpackage Core
Topic: Machine Learning & AI SubTopic: Core ML Tags:
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1
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0
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164
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Reply to iCloud Sync not working with iPhone, works fine for Mac.
I can confirm my App works again (iPad 26.5 beta) .✅ ⁇ I cannot confirm the apple example program works as I've run out of devices (and I'm not sure if CkSyncEngine behaves properly with sandbox users or Xcode simulation)
Topic: App & System Services SubTopic: iCloud & Data Tags:
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