Some Macs recently received a macOS system update which disabled the simulator runtimes used by Xcode 15, including the simulators for iOS, tvOS, watchOS, and visionOS. If your Mac received this update, you will receive the following error message and will be unable to use the simulator: The com.apple.CoreSimulator.SimRuntime.iOS-17-2 simulator runtime is not available. Domain: com.apple.CoreSimulator.SimError Code: 401 Failure Reason: runtime profile not found using "System" match policy Recovery Suggestion: Download the com.apple.CoreSimulator.SimRuntime.iOS-17-2 simulator runtime from the Xcode To resume using the simulator, please reboot your Mac. After rebooting, check Xcode Preferences → Platforms to ensure that the simulator runtime you would like to use is still installed. If it is missing, use the Get button to download it again. The Xcode 15.3 Release Notes are also updated with this information.

I have submitted a feedback report regarding Xcode 27.1 RC Device Hub: iPhone Duo screen captures function only work when the device is fully closed; alternative hinge positions produce a blank display.

On Xcode 26 and earlier versions, two-finger touches were possible on Simulator by holding down the option key. On Xcode 27 with Device Hub, this is no longer possible. While the trackpad can be used for pinch and rotate gestures, two-finger taps and two-finger pans are not possible. This is a major regression that renders our app basically unusable in Device Hub. We rely on two-finger tap and pan gestures to navigate our 3D models. Not being able to do this in Device Hub and in Xcode previews would be a huge loss. Is this actually no longer supported or am I missing something?

Hi, xcodebuild -downloadPlatform iOS stays at "Preparing to download..." for the iOS 27.1 Simulator (24A94425). mobileassetd receives 0 bytes. Environment: MacBook Pro (M3), macOS 26.7.2, Xcode 27 Tried (no change): Reinstalled macOS from Recovery Safe Mode Reset Xcode preferences Network to Apple servers is OK This started in September when the iOS 27.1 beta Simulator install failed (low disk space). mobileassetd log: Failed to set xattr on '/System/Library/AssetsV2/com_apple_MobileAsset_iOSSimulatorRuntime/1d40f…asset' (errno 2) SecKeyVerifySignature failed: CSSMERR_CSP_VERIFY_FAILED GetDecryptionKey: Failed to obtain decryption key Is there a supported way to reset the MobileAsset state or install the runtime manually? Feedback: FB25345300 Thank you.

Attempting to bring up the access point yields the following error log: [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy [GameCenterOverlayService] Could not create endpoint for service name: com.apple.GameOverlayUI.dashboard-service [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy [GameCenterOverlayService] Failed to create GameOverlayUI Dashboard Remote Proxy The same code (which is a single line setting 'active' to true) works on physical devices and on the simulator in iOS 18.6 I haven't been able to find any mention of this issue online. Any suggestions or help greatly appreciated.

Xcode is completely broken since I installed Xcode 27.1 Beta for the first time. Since then every Xcode I installed is unable to properly install simulators. Even though the SDK appears as installed in settings: Device Hub doesn't show it: To fix it I have to manually add SDK image using "xcrun simctl runtime add" and then play with a couple more commands. I've just installed Xcode 27.2 with iOS 27.2 SDK and again the same problem: There is a problem with signature: Any idea how to fix it, so that I don't have to install it manually every time...?

Tried three times now and absolutely cannot get Xcode 27 to install iOS 27 Simulators. I have done a complete uninstall of Xcode (including things in ~/Library). And even purged /System/Library/AssetsV2/com_apple_MobileAsset_iOSSimulatorRuntime/ When Xcode 27 (27A266a; release version) is installed and run the first time, I'm greeted with the SDK screen. I select iOS and it downloads that runtime. I can see it in Xcode's Components panel in Settings. I only see Any iOS Device as a target device in Xcode. If I launch Device Hub, it's empty and I cannot add any devices since the Add dialog shows No Runtimes Available. Selecting "Add Platforms in Xcode" takes me back to Xcode, but I only ever see iOS 26.5 or older in the list. I've even tried the various xcrun simctl commands, but to no avail. Why is it so difficult to have a clean install of Xcode 27, have it install the iOS 27 SDK and then be able to build and run existing projects? I'm on the release version of macOS 27.0.1 though the problems persisted earlier today on macOS 27.0 as well.

On 25 October 2026, signing in to an Apple Account in the Simulator (Settings > Apple Account > Sign in Manually) fails on iOS 27.0 and iOS 26.5 runtimes (Xcode 27.1, macOS 27.0.1, Apple silicon), for a new account (SMS second factor) and for an established account (trusted-device second factor). The password and second-factor steps complete; then akd logs "Will check in with IDMS" and POST gsas.apple.com/grandslam/GsService2/postdata returns HTTP 401 with ec -22411, sec -42023 ("This action cannot be completed at this time"), followed by "Failed to check in with IDMS! ... AKAuthenticationError Code=-7026". Settings then says the account or password is incorrect. The host Mac checks in with IDMS successfully, and the account works on icloud.com. I need a second account in the Simulator to test CloudKit share acceptance. Is this a known issue, and is there a workaround? Feedback: FB25318712.

Hello, Turning on iCloud Drive sync does not work in iOS 27 simulators. When I sign into an iCloud account and try to enable it by tapping the switch in the iCloud Drive settings within the iCloud account area of Settings, the switch doesn't stay on and the feature is never enabled. I don't get an error or anything telling me what's going on. Anyone else seeing this? When I create a new simulator for iPhone 26.5 it seems to work fine just as before. I've tested this with Xcode 26.6 17F113 and Xcode 27 RC 27A266a.

I am testing SFSpeechRecognizer using the en_US locale. When the iPhone Simulator’s system language is set to Japanese, SFSpeechRecognizer.isAvailable returns false for en_US, so speech recognition is unavailable. As far as I have tested, this issue does not occur on iOS Simulator 26.2 or earlier. Is this a Simulator-specific issue, or is it a behavior change that could also occur on physical devices? Has any additional setup become necessary to use speech recognition in Simulator? I then changed the iPhone Simulator’s system language to English. After doing so, SFSpeechRecognizer.isAvailable returned true for en_US. However, starting a recognition task still failed immediately with kLSRErrorDomain Code=300, “Failed to initialize recognizer.” The following error was returned: Error Domain=kLSRErrorDomain Code=300 "Failed to initialize recognizer" UserInfo={ NSLocalizedDescription=Failed to initialize recognizer, NSUnderlyingError={ Error Domain=kLSRErrorDomain Code=300 "Failed to create recognizer from=/Users/<USERNAME>/Library/Developer/CoreSimulator/Devices/<DEVICE-UUID>/data/private/var/MobileAsset/AssetsV2/com_apple_MobileAsset_UAF_Siri_Understanding/purpose_auto/ c079bfa6b8856202dc8cb2135fef3b06229ced6e.asset/AssetData/mini.json" UserInfo={ NSLocalizedDescription=Failed to create recognizer from=/Users/<USERNAME>/Library/Developer/CoreSimulator/Devices/<DEVICE-UUID>/data/private/var/MobileAsset/AssetsV2/com_apple_MobileAsset_UAF_Siri_Understanding/purpose_auto/ c079bfa6b8856202dc8cb2135fef3b06229ced6e.asset/AssetData/mini.json } } } I have not observed either of these issues on iOS Simulator 26.2 or earlier: With the Simulator language set to Japanese, the en_US recognizer does not become unavailable. When SFSpeechRecognizer.isAvailable is true, recognition does not fail with kLSRErrorDomain Code=300. Environment Xcode: 26.6 (17F113) iOS Simulator 26.5 (23F77), iPhone 17 (A3258J/A) iOS Simulator 26.4 (23E244), iPhone 17 (A3258J/A)

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

Hello, I am experiencing an issue when running an iOS application on an iOS 17.x Simulator using Xcode 27.1. The simulator becomes completely unresponsive to user input, whether my application is running or not. I cannot type anything or interact with the screen, including tapping UI elements. However, I can still switch between Light and Dark Mode, and the appearance changes accordingly. This makes it impossible to test my application on iOS 17.x using the simulator. Has anyone experienced a similar issue with Xcode 27.1 and the iOS 17.x Simulator? Is there a known workaround or configuration that could resolve this? Any help or suggestions would be appreciated. Thank you.

Using Xcode 27.1 RC, the iPhone Duo simulator (Device Hub) only comes with the Settings and Safari apps. Am I missing something? Are there plans to have the usual simulator apps such as Photos, Calendar, Reminders, Maps, etc.? In these early stages it would be really nice to have some real apps to look at for examples of how some things should work/appear on the Duo in different layouts.

Where did the simulator "Slow animations" mode go? I can't find it in the Xcode 27 beta 2 "Device Hub". This feature is incredibly useful. I'm assuming it's a glitch that it's missing, or I'm just not looking in the right place.

Can I download the iOS 26 simulator runtime via a download link? The machine I need to deploy on may require an offline package installation due to firewall restrictions.

I am unable to download and install the iOS Simulator runtime in Xcode 26.6. Environment: MacBook Air with Apple silicon macOS Tahoe 26.6 Xcode 26.6 Build version 17F113 xcode-select -p: /Applications/Xcode.app/Contents/Developer xcodebuild -showsdks correctly reports: Simulator - iOS 26.5 -sdk iphonesimulator26.5 However: xcrun simctl list runtimes returns: == Runtimes == No Simulator runtime is installed. In: Xcode > Settings > Components I attempted to install: iOS 26.5.1 + iOS 26.5 Simulator but it remains at: Preparing... for a very long time without actually downloading the runtime. I also tried: xcodebuild -downloadPlatform iOS This eventually failed with: Download was cancelled exit code 70 I also tried: xcodebuild -downloadPlatform iOS -exportPath ~/Downloads/XcodePlatforms The destination directory remains at 0 bytes. Checks already completed: More than 860 GiB free disk space Mac restarted Xcode quit and reopened xcode-select points to the correct Xcode installation /etc/hosts contains no Apple blocking entries gdmf.apple.com resolves correctly HTTPS connectivity to gdmf.apple.com works Apple MobileAsset / software update services are running iOS Simulator SDK itself is installed correctly The project can compile for iphonesimulator26.5, but Simulator execution and tests are blocked because no runtime can be installed. Questions: Is this a known issue with Xcode 26.6? Is there an official alternative way to download the iOS Simulator runtime? Can I install an earlier supported iOS Simulator runtime instead? Is there a MobileAsset or Xcode cache reset procedure recommended by Apple? Thank you.

I have numerous simulator runtimes marked as "Deleting": $ xcrun simctl runtime list == Disk Images == -- iOS -- iOS 18.0 (22A3351) - 036938A4-AAF7-4671-8880-8E381770E397 (Deleting) iOS 18.0 (22A5326g) - 756A6FE1-A9C7-4A3D-A8FD-01FD7B5F84BC (Deleting) iOS 18.0 (22A5307f) - 5DB182D5-FAA1-477D-922F-CFA728C5A6FA (Deleting) iOS 18.0 (22A5346a) - C844925F-1BCA-46FD-B0B9-21587AB3EDE5 (Deleting) iOS 18.0 (22A5307f) - CC3EB15F-4EAA-4591-AE5C-2762AC17C426 (Unusable - Other Failure: Duplicate of 5E3173BD-25F7-4446-9593-B5E6330B65CE) -- tvOS -- tvOS 18.0 (22J5290l) - A7A2E335-D433-456D-AC61-D5061317A911 (Ready) -- watchOS -- watchOS 11.0 (22R5284o) - 87DB6C3E-A51E-4394-AD35-F6BDCBDEFDC9 (Ready) How to I finish deleting these runtimes? I can't re-install, because: $ simctl runtime add iOS_18_Release_Candidate_Simulator_Runtime.dmg The iOS Simulator runtime 22A3351 is not installed, installing... D: C76A5156-5225-4683-806A-FC604074F2C7 iOS (18.0 - 22A3351) (Unusable - Other Failure: Error Domain=SimDiskImageErrorDomain Code=5 "Duplicate of 036938A4-AAF7-4671-8880-8E381770E397" UserInfo={NSLocalizedDescription=Duplicate of 036938A4-AAF7-4671-8880-8E381770E397, unusableErrorDetail=}) and it's the "Deleting" runtimes aren't usable (causing things like ibtool/actool to stop working), presumably because they're "Deleting." A reboot does not fix anything.

A Mac reboot fixed it for a few images, but then it went black again.

What is Apple’s supported way to prevent outbound network access during app-hosted iOS Simulator unit tests, without disabling system services or modifying system tunnel routes? Environment: Apple silicon Mac, macOS 26.6.2 Xcode 27.0, iOS 27.0 Simulator Separate, newly created Simulator Xcode-managed local ad-hoc build 17 fictional-data tests using XCTest and Swift Testing We intend to use xcodebuild test-without-building. The test bodies exercise models and request construction without sending requests, but the app host’s startup behavior is also within our isolation requirement. Tests have not been run. During an authorized Wi-Fi-off diagnostic, we waited ten seconds and collected three samples, checking Wi-Fi power before and after each sample. All showed: Wi-Fi Off No effective network interface reported by scutil --nwi No route selected by ordinary local lookups for IPv4 and IPv6 documentation addresses Remaining interface-scoped IPv6 default entries through utun interfaces Routes selected when IPv6 lookups explicitly specified those tunnel interfaces These were routing-table queries only; no diagnostic packets were sent. Wi-Fi was restored afterward. We have not established whether the scoped routes could carry external traffic. Please advise on a supported isolation mechanism and how to validate it for the Simulator test host, including startup. We want to preserve normal macOS security/system services and avoid relying on either route-table presence or absence as proof of isolation. No real user data or credentials are needed. We can provide a redacted diagnostic summary if useful.

I’m simulating an iPhone Duo using Xcode 27.1 beta, and I’m having trouble tapping buttons placed near the top of the screen. It seems that the top ~20 pixels of the screen are not responding to taps. In my ViewController, preferredScreenEdgesDeferringSystemGestures returns .all, so system gestures should require two swipes to be triggered. However, a simple tap in this area does not seem to be recognized. This appears to happen only on iPhone Duo; taps work normally on other iPhone models. Does anyone know whether this behavior is expected to occur on the actual iPhone Duo hardware as well, or is it specific to the simulator? For reference, the buttons are positioned according to LayoutMarginsGuide with Safe Area. FB24914903 I wonder if anyone knows how to get the top margin size programmatically.

I’m seeing a reproducible iPhone Duo Simulator boot failure in Xcode 27.1. Environment Xcode 27.1 / 27A9275 macOS Tahoe 26.6.2, then 26.7.1 Apple silicon Mac iPhone Duo / V68 / iPhone19,4 iOS 27.1 Simulator Runtime builds 24A94232 and 24A94425 Failure Running: xcrun simctl bootstatus -b terminates with: Status=3, isTerminal=YES Data Migration Failed Fresh Duo devices reproduced the failure on both runtime builds. During fresh migrations, DataMigrator logged: Reporting migration failure due to migration progress window incident On one fresh-device run, all 35 recorded migration plugins completed successfully, but the aggregate migration result was false and no failed-plugin identifier was exposed. I also tested: brand-new Duo simulator data restarting the correct CoreSimulatorService explicitly selecting runtime 24A94425 updating macOS from 26.6.2 to 26.7.1 An ordinary iPhone simulator on iOS 27.0 works on the same Mac. The failure occurs before any application is installed or launched. Feedback filed: FB25221101 Has anyone else seen this with the iPhone Duo Simulator in Xcode 27.1?