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? Temporary Workaround Using -Onone resolves the issue but is not viable for production due to significant increase in app size. Any guidance would be greatly appreciated.

Each time I launch a Debug version of the app on iOS Simulator, I see the Launch Screen presented and then about a 30-second delay before the app is responsive and debug output appears in the console panel. Filed FB22345091

I’m blocked debugging a watchOS app on a physical Apple Watch. The iPhone connects to Xcode normally (wired), but the Watch either fails to connect with a tunnel timeout or disappears entirely from Xcode after I unpaired it inside Devices & Simulators. Environment Mac: macOS 26.x (Apple Silicon Mac) Xcode: 26.2 iPhone: iOS 26.1 Apple Watch Ultra: watchOS 26.2 (build 23S303) Connection: iPhone connected to Mac via USB (trusted). Watch paired to iPhone and working normally in the Watch app. Issue A (when Watch is visible in Xcode) In Xcode → Window → Devices and Simulators, the Watch shows up but is not usable and fails to connect. Error: “Previous preparation error: A connection to this device could not be established.” “Timed out while attempting to establish tunnel using negotiated network parameters.” In some attempts the Watch shows “Capacity: Unknown” / limited details, and then fails during preparation. Issue B (after unpairing Watch in Xcode only) I unpaired/removed the Watch in Xcode (Devices & Simulators). I did not unpair the Watch from the iPhone. Now: iPhone appears in Xcode and works normally for builds. Watch is still paired to the iPhone and works normally. Watch no longer appears anywhere in Xcode Devices & Simulators (no paired watch section, no watch run destination). What I’ve tried Reboots of Mac, iPhone, Watch (multiple times) Watch unlocked, awake; iPhone unlocked and close to Watch Verified Watch is paired and connected in iPhone Watch app Developer Mode enabled on iPhone and Watch Wi-Fi and Bluetooth ON (Mac/iPhone/Watch), tried toggling both Tried on home Wi-Fi and also with iPhone hotspot (same result) Resetting trust prompts / reconnecting iPhone via USB, re-trusting Mac Apple Watch: “Clear Trusted Computers” Xcode: removing/re-adding devices; clearing derived data; restarting Xcode Watch Developer networking test: Responsiveness = Medium (430 RPM) Questions 1. Is this a known issue/regression with Xcode 26.2 + watchOS 26.2 tunneling (CoreDevice / devicectl)? 2. Is there an Apple-supported way to force Xcode to re-discover a paired Watch after it was removed from Xcode Devices & Simulators (without unpairing the Watch from the iPhone)? 3. Any recommended logs or diagnostic steps I should collect (Console logs, sysdiagnose, specific Xcode/CoreDevice logs) to include in a Feedback report? If helpful, I can provide the full error text from Xcode’s Devices window and any logs you recommend. Thank you in advance,

Since 26.4 beta 3 I've been having errors after a few hours of using Claude Agent. I get an error stating that I am not authed. If I go into Xcode settings, it still shows I am signed into Claude Agent. I have click sign out and then go through the whole auth process again to start using the agent again. This is on two separate computers. Is there anything I can do to stop this behaviour and stay logged in for longer? It worked fine in 26.3.

My development work is paused as Xcode is now non-functional on my Macs. Loading any project into Xcode soon leads to a hang and Force Quit. The SDKs are listed as "status unavailable". No Simulators are available. I've tried previous versions of Xcode; removing everything and re-installing; installation from the Store and direct from the Apple Developer site. I've created a Feedback issue. This happens on both of my Mac minis. I'm running Tahoe 26.4 (25E246) on both.

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?

I am unable to install due to the following error: "can't install the software because it is not currently available from the software update server" Mac OS: Tahoe 26.1 CLI: Iterm2 Command : xcode-select --install Output: Command transitions to a GUI installer and attempts to download but fails with the attached error. As a result I am unable to proceed with installing Homebrew from CLI or downloaded pkg

Since I have changed of iPhone (yesterday) to run my draft application, I systematically, and instantaneously get a message "The application failed to launch.", i.e. the application successfully built and was downloaded to the new iPhone (Iphone 17 pro - iOS 26.4). I have checked that this new iPhone is well registered on my list of authorized devices. Could you help me to fix this issue ? Here is the verbose attached to the failure: The application failed to launch. Domain: com.apple.dt.CoreDeviceError Code: 10002 User Info: { BundleIdentifier = "com.laurent-guise.ble-laser"; DVTErrorCreationDateKey = "2026-03-30 07:59:46 +0000"; IDERunOperationFailingWorker = IDELaunchCoreDeviceWorker; } The request to open "com.laurent-guise.ble-laser" failed. Domain: FBSOpenApplicationServiceErrorDomain Code: 1 Failure Reason: The request was denied by service delegate (SBMainWorkspace). User Info: { BSErrorCodeDescription = RequestDenied; FBSOpenApplicationRequestID = 0x3868; } The operation couldn’t be completed. The process failed to launch. Domain: FBProcessExit Code: 64 Failure Reason: The process failed to launch. User Info: { BSErrorCodeDescription = "launch-failed"; } The operation couldn’t be completed. Launch failed. Domain: RBSRequestErrorDomain Code: 5 Failure Reason: Launch failed. Launchd job spawn failed Domain: NSPOSIXErrorDomain Code: 85 Failure Reason: Bad executable (or shared library) Event Metadata: com.apple.dt.IDERunOperationWorkerFinished : { "device_identifier" = "00008150-000E19E814A1401C"; "device_isCoreDevice" = 1; "device_model" = "iPhone18,1"; "device_osBuild" = "26.4 (23E246)"; "device_osBuild_monotonic" = 2304024600; "device_os_variant" = 1; "device_platform" = "com.apple.platform.iphoneos"; "device_platform_family" = 2; "device_reality" = 1; "device_thinningType" = "iPhone18,1"; "device_transport" = 0; "launchSession_schemeCommand" = Run; "launchSession_schemeCommand_enum" = 1; "launchSession_targetArch" = arm64; "launchSession_targetArch_enum" = 6; "operation_duration_ms" = 6590; "operation_errorCode" = 1; "operation_errorDomain" = "com.apple.dt.CoreDeviceError.10002.FBSOpenApplicationServiceErrorDomain"; "operation_errorWorker" = IDELaunchCoreDeviceWorker; "operation_error_reportable" = 1; "operation_name" = IDERunOperationWorkerGroup; "param_consoleMode" = 1; "param_debugger_attachToExtensions" = 0; "param_debugger_attachToXPC" = 1; "param_debugger_type" = 3; "param_destination_isProxy" = 0; "param_destination_platform" = "com.apple.platform.iphoneos"; "param_diag_MTE_enable" = 0; "param_diag_MainThreadChecker_stopOnIssue" = 0; "param_diag_MallocStackLogging_enableDuringAttach" = 0; "param_diag_MallocStackLogging_enableForXPC" = 1; "param_diag_allowLocationSimulation" = 1; "param_diag_checker_mtc_enable" = 1; "param_diag_checker_tpc_enable" = 1; "param_diag_gpu_frameCapture_enable" = 0; "param_diag_gpu_shaderValidation_enable" = 0; "param_diag_gpu_validation_enable" = 0; "param_diag_guardMalloc_enable" = 0; "param_diag_memoryGraphOnResourceException" = 0; "param_diag_queueDebugging_enable" = 1; "param_diag_runtimeProfile_generate" = 0; "param_diag_sanitizer_asan_enable" = 0; "param_diag_sanitizer_tsan_enable" = 0; "param_diag_sanitizer_tsan_stopOnIssue" = 0; "param_diag_sanitizer_ubsan_enable" = 0; "param_diag_sanitizer_ubsan_stopOnIssue" = 0; "param_diag_showNonLocalizedStrings" = 0; "param_diag_viewDebugging_enabled" = 1; "param_diag_viewDebugging_insertDylibOnLaunch" = 1; "param_install_style" = 2; "param_launcher_UID" = 2; "param_launcher_allowDeviceSensorReplayData" = 0; "param_launcher_kind" = 0; "param_launcher_style" = 99; "param_launcher_substyle" = 0; "param_lldbVersion_component_idx_1" = 0; "param_lldbVersion_monotonic" = 210000160004; "param_runnable_appExtensionHostRunMode" = 0; "param_runnable_productType" = "com.apple.product-type.application"; "param_testing_launchedForTesting" = 0; "param_testing_suppressSimulatorApp" = 0; "param_testing_usingCLI" = 0; "sdk_canonicalName" = "iphoneos26.4"; "sdk_osVersion" = "26.4"; "sdk_platformID" = 2; "sdk_variant" = iphoneos; "sdk_version_monotonic" = 2304023700; } System Information macOS Version 26.4 (Build 25E246) Xcode 26.4 (24909) (Build 17E192) Timestamp: 2026-03-30T09:59:46+02:00

I’m seeing a regression in Xcode 26.4 where Interface Builder will not allow connecting IBOutlets or IBActions. Symptoms: The usual gutter circle/dot does not appear next to IBOutlet / IBAction in the code editor Because of this, I cannot: drag from storyboard → code drag from code → storyboard The class is valid and already connected to the storyboard (existing outlets work) Assistant Editor opens the correct view controller file Important: The exact same project, unchanged, works perfectly in Xcode 26.3. I can create and connect outlets/actions normally there. ⸻ Environment Xcode: 26.4 macOS: 26.4 Mac Mini M4 Pro 64G Ram Project: Objective-C UIKit app using Storyboards This is a long-running, ObjC, project (not newly created) ⸻ What I’ve already tried To rule out the usual suspects: Verified View Controller Custom Class is correctly set in Identity Inspector Verified files are in the correct Target Membership Verified outlets are declared correctly in the .h file: @property (weak, nonatomic) IBOutlet UILabel *exampleLabel; Opened correct file manually (not relying on Automatic Assistant) Tried both: storyboard → code drag code → storyboard drag Tried using Connections Inspector Clean Build Folder Deleted entire DerivedData Restarted Xcode Updated macOS to 26.4 Ran: sudo xcodebuild -runFirstLaunch Confirmed required platform components installed Reopened project fresh ⸻ Observations In Xcode 26.4 the outlet “connection circles” are completely missing In Xcode 26.3 they appear immediately for the same code Existing connections still function at runtime — this is purely an Interface Builder issue ⸻ Question The gutter circles appearance has always been flaky in Xcode over the 13+ years I've been using it but now with 26.4 they have completely disappeared. Has anyone else seen this in Xcode 26.4, or found a workaround? At this point it looks like a regression in Interface Builder, but I haven’t found any mention of it yet.

After updating to Xcode 26.4 the pasteboard sharing feature in the simulators doesn't work.

Hello Xcode 26.0.1 (17A400) Missing some Metal components When building a program using Metal, it induces an unexpected error : “error: error: cannot execute tool 'metal' due to missing Metal Toolchain; use: xcodebuild -downloadComponent MetalToolchain Command CompileMetalFile failed with a nonzero exit code” Which terminates the build The fix given “xcodebuild -downloadComponent MetalToolchain” using sudo does not work Did someone find a work around or could resolve the issue? Many thanks Jean MacBook Air M4; macOS 26.0.1; Xcode 26.0.1

Device Details: MBP M2 Pro AND MBP M3 Pro macOS 26.3 (25D125) Xcode Version 26.3, 26.2, 26.1 (I reinstalled all 3 of these after the macOS update) BUG: Xcode hangs indefinitely when performing Source Control operations (Pull or Push) on a Git repository that uses SSH authentication. The same repository works correctly when performing the equivalent Git operations from the Terminal using the Git CLI. The issue appears to be specific to Xcode’s internal Source Control integration. When the operation is triggered from Xcode, the UI shows a spinning progress indicator and never completes. Terminal Git commands (git fetch, git pull, git push) complete normally using the same SSH key and repository. A hang sample taken during the issue shows the Xcode main thread blocked in Source Control authentication and fingerprint handling code paths, including: IDESourceControlUIHandler IDESourceControlFingerprintManager handleAuthenticationFailure showFingerprintAlertOnWindow This suggests Xcode may be waiting on a Source Control authentication or host fingerprint UI flow that never resolves. SSH connectivity itself is functioning correctly: ssh -T git@bitbucket.org and ssh -T git@github.com both authenticate successfully. git ls-remote, git fetch, git pull, and git push all work correctly from Terminal. No Source Control accounts are configured in Xcode Preferences. Authentication relies entirely on SSH keys. Steps to Reproduce Configure an SSH key for Git access (e.g., Bitbucket or GitHub) and confirm it works via Terminal. Clone or open an existing Git repository that uses SSH (git@host:repo.git). Open the project/workspace in Xcode. In Xcode, attempt a Source Control operation such as: Source Control → Pull Source Control → Push Observe that Xcode displays a spinning progress indicator and does not complete the operation. Logs available on this Feedback Assist ID: FB22146913

I’m currently working on a macOS application to control a USB camera’s optical zoom via a direct USB connection. My situation: I am using a USB camera that supports optical zoom. I downloaded an open-source project, CameraController. The prebuilt binary provided on GitHub works perfectly, and I can successfully control the camera’s optical zoom. However, when I build and run the same project from source in Xcode, the zoom control UI appears disabled (grayed out). The project compiles without errors. Additionally, I attempted to implement zoom control myself using the UVC protocol in Swift . However, it seems that the zoom control commands are not successfully sent or recognized by the camera. Questions: Why would the prebuilt app work, but the same source code built locally results in disabled zoom controls? Are there known limitations on sending zoom control requests via USB on macOS? Is there a recommended modern approach for controlling optical zoom programmatically via Swift? Any insights, debugging suggestions, or references would be greatly appreciated. Thanks in advance!

Hi everyone, yesterday I updated my macOS and Xcode to the latest versions and today I have the strangest thing: Canvas is always crashing whenever I click it, in any and all my Projects. The full Simulator works just fine; only the Preview Canvas crashes. All the crash reports say it's because of AXRemoteElement-BackgroundFetch, and ChatGPT says it's not because of my code. These are very simple Projects, just for experimentation. Nothing complex, just native code while I follow examples in a SwiftUI book. Anyone else having this issue? Translated Report (Full Report Below) ------------------------------------- Process: PreviewShell [2179] Path: /Volumes/VOLUME/*/PreviewShell.app/PreviewShell Identifier: com.apple.PreviewShell Version: 16.0 (23.40.29) Code Type: ARM-64 (Native) Role: Foreground Parent Process: launchd_sim [1405] Coalition: com.apple.CoreSimulator.SimDevice.E9525D59-3C07-43F9-ACC9-18CF5DD0DAA1 [1516] Responsible Process: SimulatorTrampoline [1120] User ID: 501 Date/Time: 2026-03-26 15:00:02.6060 +0200 Launch Time: 2026-03-26 14:57:33.8870 +0200 Hardware Model: Mac17,9 OS Version: macOS 26.4 (25E246) Release Type: User Crash Reporter Key: 1DC4EA68-804A-D651-804B-C2E0C13D9B87 Incident Identifier: F3F1A52F-AFF9-4470-A216-7364FCB5B7E6 Time Awake Since Boot: 1100 seconds System Integrity Protection: enabled Triggered by Thread: 4, Dispatch Queue: AXRemoteElement-BackgroundFetch Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Subtype: KERN_PROTECTION_FAILURE at 0x000000016b6bfff0 Exception Message: Could not determine thread index for stack guard region Exception Codes: 0x0000000000000002, 0x000000016b6bfff0 Termination Reason: Namespace SIGNAL, Code 10, Bus error: 10 Terminating Process: exc handler [2179]

I'm trying to download the iOS 26.2 simulator, but it fails both in Xcode and via the command line. When I run: xcodebuild -downloadPlatform iOS -buildVersion 26.2 -exportPath ~/Downloads It returns: iOS 26.2 is not available for download. I would like to know: Why iOS 26.2 simulator cannot be downloaded at the moment. Whether iOS 26.2 simulator is still available, or if it has been removed or replaced. How to properly get and install the iOS 26.2 simulator. Any official explanation or solution would be greatly appreciated. Thank you!

After updating to Xcode 26.4 (public release), I’m no longer able to paste from the Mac clipboard into the Simulator. Automatically Sync Pasteboard is on, and I have content on the clipboard, but paste doesn’t work—Cmd+V does nothing, and there’s no Paste option in the context menu. Is anyone else seeing this?

I am experiencing a UI issue after migrating my app from Xcode 16 to Xcode 26. In my implementation, I have a toolbar that contains multiple buttons along with a dropdown menu. The hierarchy for dropdown is as follows: **Toolbar → ToolbarItem → View → Menu → Picker ** Prior to Xcode 26, this setup worked smoothly in production builds. The dropdown (Menu + Picker) behaves as expected, and selecting a value triggers loading a dataset containing thousands of records on the screen. However, after upgrading to Xcode 26, I am observing an animation glitch when dismissing the dropdown after a selection is made. Specifically, the dropdown briefly shows a “capsule-like” animation artifact during dismissal, which persists for a few seconds. This visual issue is noticeable and negatively impacts the perceived performance and user experience of the app. This issue is occurring in an already released app built with Xcode 26. Questions: Is this a known issue or regression in Xcode 26 / SwiftUI Menu or Picker components? If yes, are there any known fixes or upcoming Xcode versions where this is resolved? If not, what would be the recommended approach to eliminate or minimize this animation glitch when dismissing the dropdown? Additional Context: The issue appears only after migration to Xcode 26. The dataset loaded after selection is large (thousands of records). The glitch specifically occurs during the dismissal animation of the Menu/Picker. Any guidance or workarounds would be greatly appreciated.

For difficult reasons I won’t get into, I ended up manually downloading the latest iOS 26 simulator runtime. I now have a file named 78756498-8AB4-4E5A-986C-7AA435758657.aar copied to my Mac. How do I get this archive installed so Xcode 26 recognizes it as a proper simulator runtime component? All searching I‘ve done for manually installing simulators references dmg files and older versions of Xcode. There’s no mention of aar files. When I tried the command: sudo xcrun simctl runtime add ./78756498-8AB4-4E5A-986C-7AA435758657.aar I get the result: An error was encountered processing the command (domain=NSPOSIXErrorDomain, code=22): Error while creating AEA backend Invalid argument I tried to use Archive Utility to open the file but that just says it is unable to expand the file. I even tried renaming the file with a dmg extension and then tried mounting the file and I get the same “AEA backend” error. My Mac doesn’t have sufficient Internet access to let me download and install this normally through Xcode. I need to find a way to get this file installed manually.

I have an iOS project based on SwiftUI in which almost all code is organised in Packages. With Xcode 26.2 and 26.3, I can preview all SwiftUI views without issues. With Xcode 26.4, the same previews don't work, in the canvas appears this error message: "Cannot preview in this file. Could not find target description for “TaskListView.swift”". The explanation is: "The list of source files that produce object files did not contain this file to be previewed. Check to make sure it is not excluded using the EXCLUDED_SOURCE_FILE_NAMES build setting." If I add a SwiftUI view to the main project files (not in a package), the preview works as expected. Is it an Xcode 26.4 regression? Or do I need to modify some configuration file?

Hello Apple Developer Community, I'm seeing a persistent crash in my iOS app reported via Firebase Crashlytics. The issue only started appearing on devices running iOS 26.3.0 and above (the crash does not occur on lower iOS versions, and it's unrelated to my app's version number). Key points: My app does NOT use any Text-to-Speech (TTS) features whatsoever. No AVSpeechSynthesizer, no Speech framework, no related APIs called from our code. My app is primarily written in Objective-C (with some Swift components possibly via dependencies). The crash stack is entirely within Apple's private TextToSpeech framework, specifically in ausdk::BufferAllocator::instance(). I suspect it might be indirectly triggered by a third-party ad SDK (e.g., Google Mobile Ads, AppLovin, etc.) that could be loading or interacting with accessibility features in the background — but this is just a hypothesis, as I have no direct evidence yet. Here is one representative crash log: Crashed: com.apple.root.user-initiated-qos.cooperative 0 TextToSpeech 0x6bb00 ausdk::BufferAllocator::instance() + 99800 1 TextToSpeech 0xf8c60 ausdk::BufferAllocator::instance() + 677688 2 TextToSpeech 0xf8c60 ausdk::BufferAllocator::instance() + 677688 3 TextToSpeech 0x1a0b9c ausdk::BufferAllocator::instance() + 1365620 4 libswift_Concurrency.dylib 0x628b4 swift::runJobInEstablishedExecutorContext(swift::Job*) + 288 5 libswift_Concurrency.dylib 0x63d28 swift_job_runImpl(swift::Job*, swift::SerialExecutorRef) + 156 6 libdispatch.dylib 0x13f48 _dispatch_root_queue_drain + 364 7 libdispatch.dylib 0x146fc _dispatch_worker_thread2 + 180 8 libsystem_pthread.dylib 0x137c _pthread_wqthread + 232 9 libsystem_pthread.dylib 0x8c0 start_wqthread + 8 The crash occurs on a background cooperative queue (Swift Concurrency). Questions: Has anyone else seen crashes inside ausdk::BufferAllocator::instance() in TextToSpeech on iOS 26.3.0+ even without using TTS in their app? Could a third-party ad SDK be causing the TextToSpeech framework to load unexpectedly (e.g., via accessibility preloading)? Is this a known bug in iOS 26's Spoken Content / Speak Selection features? Any workarounds or fixes from Apple? Any insights, similar reports (especially from Objective-C based apps), or advice would be greatly appreciated! Thanks!