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.

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

Hi, I’m testing the new NowPlaying framework on iOS 27 using Xcode 27 and an iPhone 17 Simulator, and I’m seeing some behavior that I’m trying to determine is a Simulator issue or something incorrect in my implementation. I have a local AVPlayer playing an MP3 and a MediaSession conforming to MediaSessionRepresentable. The session publishes MusicContent with static artwork, AnimatedArtwork using the .tall aspect ratio, a MediaPlaybackSnapshot, and commands for play, pause, previous, next, and seek. The strange behavior is: I start playback and call requestToBecomeApplicationPrimary(). It succeeds and isApplicationPrimary becomes true, but isSystemPrimary remains false. I lock the Simulator for the first time. There is no Now Playing UI or metadata. I unlock it and return to the app. After recreating/re-registering the MediaSession and calling requestToBecomeApplicationPrimary() again, isSystemPrimary sometimes becomes true. When I lock the Simulator a second time, the Now Playing UI finally appears and the animated 3:4 artwork works correctly. However, the Lock Screen card still does not show the expected play/pause/previous/next buttons. It only shows the title, artist, progress bar, and volume control, despite those commands being included in commands. When the second session succeeds, the framework also starts requesting the artwork as expected: applicationPrimary: true systemPrimary: true Animated preview requested: (1206, 1608) ratio: tall Static artwork requested Animated video requested: (1206, 1608) ratio: tall Calling requestToBecomeSystemPrimary() directly has also consistently returned: internalFailure Playback itself continues correctly throughout all of this. So I’m trying to understand whether anyone else is seeing similar behavior with the iOS 27 Simulator: MediaSession becoming application-primary but not system-primary on the initial playback Now Playing metadata only appearing after a lock/unlock/re-registration cycle media commands being supplied but playback buttons missing from the Lock Screen requestToBecomeSystemPrimary() returning internalFailure I have not yet tested the same build on a physical iOS 27 device, so I’m particularly interested in whether this is currently a known Simulator limitation/bug or whether there is another step required when publishing a local playback MediaSession. Thanks!

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 have just updated to Xcode 27 to support this version, however... my app is a navigation app with CarPlay support... The I/O > External Displays option through the Simulator helps a lot when testing it, but I’ve noticed it is now gone Why? Who thought this was a good idea? Some of us support apps that are beyond a simple ToDo app So now I have to go back to the previous version of Xcode, or what?

The iOS 17 simulator does not respond at all when I try to interact with it. The simulator is not frozen as I can still control appearance and launch apps via the right sidebar. Things like the home button and clicking on the screen simply don’t work. I am using Xcode 27 beta 6. Feedback ID: FB24674634

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?

Hello all, Yesterday, I found out that there's 60GB's of old simulator volumes on my mac in /Library/Developer/CoreSimulator/Volumes/. When I try to delete those through Xcode Settings -> Components under Other Installed Platforms, it looks like they are deleted, but after restarting my Mac, they simply return. I tried the solution proposed here (which is to delete the dmg files in /Library/Developer/CoreSimulator/Images/), but in my case, there are no dmg files in there. So it looks like they were properly deleted, unlike those in /Library/Developer/CoreSimulator/Volumes/. I could obviously try to delete the dmg files in /Library/Developer/CoreSimulator/Volumes/, but that doesn't work according to a post on reddit that I'm not allowed to show here (It's called 'Deleted 240GB of Xcode simulators multiple times but they keep remounting - how do I permanently remove them?') And I wonder if it's a safe thing to do. Do you have any suggestions for how to remove the old volumes correctly and permanently?

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.

For the life of me, I cannot find how to bring up the Siri Remote in the Apple TV Simulator in Xcode 27 Device Hub (Beta). Is it no longer available? I have always seem to have had issues using the computer's keyboard for navigating my tvOS apps. Maybe it's me, but the Siri Remote always worked perfectly fine. I hope the remote will make a reappearance in the next beta... ?

Dear Apple Developer Community, Our app monitors a user-defined region by using startMonitoring on an instance of CLLocationManager. While it works as intended on a real device, starting with Xcode 27, this method invocation always results in >locationManager ... monitoringDidFailFor< being called. The error code is always kCLErrorDomain Code=5 but this only occurs within iOS 27 simulators. It works perfectly in iOS 26 simulators. Additionally, CLLocationManager.isMonitoringAvailable(for: CLCircularRegion.self) always returns false on these iOS 27 simulators. This issue blocks parts of our automated system tests. Is it a bug or on purpose? Thank you in advance.

I have an orphaned asset folder taking up 9.13GB located at: /System/Library/AssetsV2/com_apple_MobileAsset_iOSSimulatorRuntime/c0d3fd05106683ba0b3680d4d1afec65f098d700.asset It contains SimulatorRuntimeAsset version 18.5 (Build 22F77). Active Version: My current Xcode setup is using version 26.2 (Build 23C54). I checked the plist files in the directory and found what seems to be the cause of the issue: The "Never Collected" Flag: The Info.plist inside the orphaned asset folder explicitly sets the garbage collection behavior to "NeverCollected": <key>__AssetDefaultGarbageCollectionBehavior</key> <string>NeverCollected</string> The Catalog Mismatch: The master catalog file (com_apple_MobileAsset_iOSSimulatorRuntime.xml) in the parent directory only lists the new version (26.2). Because the old version (18.5) is missing from this XML, Xcode and mobileassetd seem to have lost track of it entirely. What I Have Tried (All Failed) Xcode Components: The version 18.5 does not appear in Settings -> Components, so I cannot delete it via the GUI. Simctl: xcrun simctl list runtimes does not list this version. Running xcrun simctl runtime delete 22F77 fails with: "No runtime disk images or bundles found matching '22F77'." Manual Deletion: sudo rm -rf [path] fails with "Operation not permitted", presumably because /System/Library/AssetsV2 is SIP-protected. Third-party Tools: Apps like DevCleaner do not detect this runtime (likely because they only scan ~/Library or /Library, not /System/Library). Has anyone found a way to force the system (perhaps via mobileassetd or a specific xcrun flag) to re-evaluate this folder and respect a deletion request? I am trying to avoid booting into Recovery Mode just to delete a cache file. Any insights on how AssetsV2 handles these "orphaned" files would be appreciated.

I'm trying to test the new “Describe a Shortcut” feature in iOS 27 using an iPhone 17 Simulator. When I open Shortcuts and tap “Describe a Shortcut”, it stays on: “Preparing support for describe a shortcut” and the text field remains disabled. I cannot enter anything or create the shortcut. My setup: Mac: MacBook Pro macOS: 27 Xcode: 26.5 (17F42) Simulator: iPhone 17 iOS: 27 I also have a physical iPhone 14 Pro, but I understand that it doesn't support Apple Intelligence, so I'm trying to test this using the iPhone 17 Simulator. Do I need to enable/download anything for Apple Intelligence on the Mac or Simulator? Or is “Describe a Shortcut” currently unsupported/not working in the iOS 27 Simulator? Any guidance on the correct setup would be appreciated.

Hello. Is there a possibility to disable saving password to account functionality in iOS Simulator ? (It breaks an automation tests) Thanks

Not able to copy anything from device hub

We are planning to upgrade our CI setup to run on Xcode 27, but we want to run tests on several older iOS simulator runtimes: 26, 18, 17… With Xcode 26.6, we had no trouble installing the needed runtimes by running: $ xcodebuild -downloadPlatform iOS -buildVersion 18.6 $ xcodebuild -downloadPlatform iOS -buildVersion 17.5 $ xcodebuild -downloadPlatform iOS -buildVersion 16.4 When using Xcode 27.0 (27A266a), however, the command fails to work for any runtime older than iOS 26.0: $ xcodebuild -downloadPlatform iOS -buildVersion 18.6 Finding content... iOS 18.6 is not available for download. At the same time, the runtimes can be installed just fine by using the "Add Platforms…" dialog from the Components pane in Xcode settings. Unfortunately, that's not an option in a headless CI machine. The same issue also reproduces in the beta versions 27.1 (27A9269) and 27.2 (27B5019j), and regardless of macOS version (26.7 or 27.0). Any idea how to work around the issue? I wonder if's a broken backend configuration or a regression in Xcode 27? Posted as FB24836279.

Anyone know if it is possible to run our app from Xcode 26.3, in an iOS 27 simulator? I see several are listed in the simulator-selection menu but thus far no luck building for them. Background: Trying to see what our app looks like in iOS 27 even before scene delegate migration is complete.

I feel I'm missing something really obvious, but how are files copied to simulators in Device Hub now? From my MacOS Finder, there's no share with simulator option and drag and drop is ignored. What am I missing?

Hi. Today we upgraded to Xcode 27 and installed the iOS 27 runtime component. Now storyboards cannot be opened. Xcode only displays "Loading iOS 27.0..." Besides, we cannot create simulators either. iOS 27 runtime appears missing even though it is installed. We tried removing and reinstalling the runtime but it didn't work. Right now all development came to a halt. Please help.

Xcode version 26.6 (17F113) MyOwnKeyboard-PAD app looks OK using simulator iPad Air 11-inch(M4). It automatically reformats to all orientations using only left and right landscape selected in General, Deployment Info. The submitted app 1.9 (4) had the portrait checked which was an error. I tried to update to version to 1.10 without portrait and upside down, but Validation states it must have all orientations needed. I tried setting all orientations and the simulator cuts off the sides. I am using a new mini M4 with Tahoe 26.6.2 Converted from an older developer mini using Migration Assistant. After conversion Xcode could not find xcspace files and apps locked up. I had to create new apps with different bundles which got conflicted in AppConnects causing rejects. When new versions are submitted, old versions cannot be removed because of submission states. Causing similar binaries, design and scam. I got trapped in the process! I have replied to AppConnect ref. binaries, design and scam. I hope someone can straighten this mess out. The good new is the free MyOwnKeyboard-PHONE analytics look OK with 4,000 impressions and 38 downloads and 172 product page reviews. It's a start! Thank you. Charlie Coupe Designer/Coder 2026sep16

Tried to execute our XCUITest test suite with XCode 27b6. The test plan is set to run in parallel. When executing tests locally with XCode 26, I can see the clone simulators executing the test (which is useful for debugging the test). With XCode 27b6 and Device Hub, I do not see the clone simulators executing, nor do I see a setting or menu item in Device Hub to show those clone simulators. There is no equivalent to the "Show Parallel Testing Devices" menu item in the XCode 26 sim. Am I missing something or is this a regression in XCode 27?