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SwiftData document-based app crashes on undo/redo with autosaveEnabled

Overview I'm developing a document-based app for macOS using SwiftData. When I undo/redo changes using Command-Z/ Command-Shift-Z, the app randomly crashes with the following error: SwiftData/BackingData.swift:425: Fatal error: Failed to retrieve the identifier for ChildItem.parentItem from KnownKeysDictionary:KnownKeysMap: [parentItem: 2, isModified: 1, index: 0] values: [Optional(0), Optional(false), Optional(DocumentTest.ParentItem)] SwiftData._KKMDBackingData And sometimes, instead of the app crashing, my created @Model objects simply disappear. They do not reappear in the @Query on undo/redo. Both of these issues go away when I set modelContext.autosaveEnabled = false The issues are occurring with Xcode 26.4 (17E192) and macOS Tahoe 26.4 (25E246). I have modified the macOS Document App project template to showcase the issue. The project, along with a screen recording of the crash, can be downloaded from here: https://drive.google.com/drive/folders/1aDO34QleTm_rB9BuvVGjzzAP6jDXOc-o?usp=share_link

App & System Services iCloud & Data SwiftData

301

Apr ’26

DeviceActivityReport Extension not working on iOS 26.4 — Extension process never launches

Device: iPhone 15 Pro Max, iOS 26.4 Xcode: Latest version, development signing with Automatically manage signing Team: Registered Apple Developer Program (Organization) Problem DeviceActivityReport SwiftUI view renders completely blank. The Report Extension's makeConfiguration(representing:) is never called (confirmed via App Group counter that stays at 0). The DeviceActivityMonitorExtension callbacks (intervalDidStart, eventDidReachThreshold) also never fire. What works AuthorizationCenter.shared.requestAuthorization(for: .individual) → .approved DeviceActivityCenter().startMonitoring() → registers schedules successfully, center.activities returns them ManagedSettingsStore.shield.applications → blocks apps correctly from the main app process Screen Time is enabled and actively collecting data (Settings > Screen Time shows per-app usage: Clash Royale 2h 35m, etc.) App Group UserDefaults(suiteName:) read/write works from the main app What doesn't work DeviceActivityReportExtension.makeConfiguration

App & System Services General Family Controls Device Activity

262

Apr ’26

My iOS Swift application works on wide range of iPhones from iPhone X to iPhone 16 Pro Max

My iOS Swift application works without problems and tested on wide range of iPhones from iPhone X to iPhone 16 Pro Max when compiled by XCode 16.4. When compiled on Xcode 26 application it frequently crashes with 0x8BADF00D FRONTBOARD error in various places when running on iPhone 14 Plus, most often when typing or when scrolling the screen. It works without problems on iPhone 16 Pro Max independent of the version of Xcode used for compilation. I followed dozens of recommendations, introduced async/await, tasks, significantly reduced complexity of layouts, making uniform bubbles etc.etc. , tried to introduce many simplifications in the application, still I could not achieve elimination of frequent crashes on iPhone 14 Plus running iOS 26.3.1, no matter what I tried. Other than that all functionality seems to be working. This is the beginning of the Crash report: Termination Reason: Namespace FRONTBOARD, >::doDecrementSlow<(swift::PerformDeinit)1>(swift::RefCountBitsT<(sw

Developer Tools & Services Apple Developer Program

Apr ’26

Reply to iOS 26 TabBar Remove Selected Capsule

Hey Albert, Thanks for the prompt response. Here is the link to Github repo: https://github.com/VJM158/UIKitTabBar What happens when you disable Liquid Glass? Do you get the results that you want? - Yes, we get the desired result. I using Xcode 26.3 with iOS 26.2 simulator Using a fully custom view with buttons is definitely an option, but my concern is that I would lose a lot of built-in UITabBar behavior such as tapping the active tab to return to root, hidesBottomBarWhenPushed, accessibility support, badging, and other system-integrated behaviors. This is a fairly large and complex app, so I’m hesitant to replace UITabBar entirely unless that is really the only reliable path. Please let me know if my understanding is correct. I’m mainly trying to understand what the recommended path forward is here. Also, if Liquid Glass is enabled for the app, is the selected capsule in UITabBar mandatory?

UI Frameworks UIKit

Apr ’26

Reply to Xcode 26.4 rc

It seems there is no way to update the Claude binary to newer versions within Xcode. Can you please add this feature? Perhaps that would help here. The version it is currently installing is 2.1.59, the latest version is 2.1.92.

Developer Tools & Services Xcode

Apr ’26

Reply to Does your Canvas in Xcode crash all the time due to AXRemoteElement-BackgroundFetch?

Same issue here. After analyzing the crash log in detail, I can confirm this is not related to our code or derived data cache. Root cause: Infinite recursion (10,915 levels deep) in -[AXElement customActions] inside AXRuntime.framework, triggered by UIAccessibilityHierarchyEncoder when PreviewShell tries to serialize the accessibility tree on the AXRemoteElement-BackgroundFetch dispatch queue. The thread stack overflows into the stack guard region, causing EXC_BAD_ACCESS (SIGBUS) / KERN_PROTECTION_FAILURE. Environment: macOS 26.5 beta (25F5042g) Xcode 26.4 (17E192) Confirmed workaround: Setting a physical iOS device as the preview destination works correctly. The bug is isolated to the simulator runtime — PreviewShell on device does not go through the affected AXRemoteElement path. I've already filed a feedback report with the full crash log attached. I'd encourage everyone affected to file their own report — the more Incident IDs Apple has, the faster this gets prioritized.

Developer Tools & Services Xcode

Apr ’26

Reply to AVPictureInPictureController with AVSampleBufferDisplayLayer: Video not scaled in PiP window on macOS

Update — Working workaround found After extensive debugging, I found a two-part workaround that gives fully functional PiP with AVSampleBufferDisplayLayer on macOS. Root cause analysis The PiP window actually contains TWO stacked rendering paths: PIPPanel (contentView: 484×272) └─ AVPictureInPictureSampleBufferDisplayLayerView (1280×720) └─ AVPictureInPictureSampleBufferDisplayLayerHostView (layer = CALayerHost, contentsScale = 1.0) ├─ AVSampleBufferDisplayLayerContentLayer (734×413) ← correctly scaled video └─ AVPictureInPictureCALayerHostView (1600×900) ← broken overlay The good path (AVSampleBufferDisplayLayerContentLayer) renders the video correctly scaled to the PiP window size. The bad path (AVPictureInPictureCALayerHostView) is drawn ON TOP and is the source of all the visual problems. Inspecting its properties reveals: hasContents = false, sublayers = 0 — it contains no actual video content backgroundColor = solid black (CGColor gray=0, alpha=1) transform = [m11=0.8, m22=0.8, m33=0.8] — Apple applies

Media Technologies General

Apr ’26

SpriteKit FPS drops significantly on iOS 26.3.1 when touching screen, even in minimal scene

Title: SpriteKit FPS drops significantly on iOS 26.3.1 when touching screen, even in a minimal scene Summary: On a real device running iOS 26.3.1, FPS drops significantly in a very simple SpriteKit scene when touching or moving a finger on the screen. This happens even with a minimal setup where update(_:), touchesBegan, and touchesMoved are not overridden. Because the issue reproduces in a minimal scene, I suspect a performance regression in SpriteKit and/or iOS rather than in app-specific logic. Environment: OS: iOS 26.3.1 Device: iPhone 12 Xcode: 26.3 Build Configuration: Release Framework: SpriteKit FPS measurement: SKView.showsFPS = true Steps to Reproduce: Present a minimal SpriteKit scene. Enable SKView.showsFPS = true. Add only a very small number of nodes to the scene. Do not override update(_:), touchesBegan, or touchesMoved. Repeatedly tap the screen or move a finger around. Actual Result: The scene stays around 60 FPS when idle. FPS drops significantly when touching or moving a finger on

Graphics & Games SpriteKit

240

Apr ’26

git ignore files not functioning

Since a combined upgrade to macOS 26.4 and Xcode 26.4 I am plagued by .DS_Store and UserInterfaceState files appearing in my repository list of uncommitted changes. This is preventing commits and merging etc. I have added the following list to both the .gitignore_global file via directly editing the file and also the Xcode>Settings>Git Settings>Ignore Files # Mac OS X .DS_Store # Xcode *.pbxuser *.mode1v3 *.mode2v3 *.perspectivev3 *.xcuserstate UserInterfaceState.xcuserstate project.xcworkspace/ xcuserdata/ # Generated files *.o *.pyc # Build directories DerivedData/ build/ # CocoaPods Pods/ # Carthage Carthage/ # Other *.swp *.lock This has been to no avail. I have raised Feedback FB22370688 for this issue. It has been marked as no similar reports which is odd because there are a lot of mentions of the .DS_Store files appearing in Git and also of problems with the ignore settings of Git. For a while, I successfully prevented the .DS_Store files from showing up as uncommitt

Developer Tools & Services Xcode Xcode

Apr ’26

Reply to Layout recursion error message

No, I don't use NSStatusBarButton in my codes, sorry. More generally, since I run Xcode on macOS 15, the number of such messages has become incredibly high... many of those logs have clearly nothing to do with what is under my control (the worse being when using UBSan and friends). This ultimately lead me to the deactivation of all logs (os_activity_mode=disable), but after that I couldn't even see some of my own logs anymore... I finally started using printf as a work around, but if someone knows a good solution to disable all system logs while keeping my own, I'm interested, thanks!

UI Frameworks AppKit

Apr ’26

Has the behavior of com.apple.security.cs.allow-jit changed on ARM64 in macOS 26 Tahoe?

We're developing a Mac App Store application that embeds the V8 JavaScript engine (via Electron). The application has shipped successfully on macOS 15.x with the following entitlements: com.apple.security.app-sandbox = true com.apple.security.cs.allow-jit = true com.apple.security.cs.allow-unsigned-executable-memory = true com.apple.security.cs.disable-library-validation = true On macOS 26 Tahoe, the exact same signed binary crashes deterministically within ~1.5 seconds on Apple Silicon with EXC_BREAKPOINT (SIGTRAP), ESR 0xf2000000. The crash is in V8's background JIT compilation thread when it attempts to manage memory page protections (transitioning pages between Read-Write and Read-Execute states via mprotect). The crash does not occur in these configurations: macOS 26 + App Sandbox + Intel x86_64 — works macOS 26 + Hardened Runtime (no sandbox) + ARM64 — works macOS 15.x + App Sandbox + ARM64 — works This appears to be a regression in how the XNU kernel handles mprotect calls for sandbox

App & System Services Core OS macOS App Sandbox Apple Silicon

353

Apr ’26

AVPictureInPictureController with AVSampleBufferDisplayLayer: Video not scaled in PiP window on macOS

AVPictureInPictureController with AVSampleBufferDisplayLayer: Video not scaled in PiP window on macOS Platform: macOS 26.4 (Tahoe) Framework: AVKit / AVFoundation Xcode: 26.4 Summary When using AVPictureInPictureController with ContentSource(sampleBufferDisplayLayer:playbackDelegate:) on macOS, the video content in the PiP window is not scaled to fit — it renders at 1:1 pixel resolution, showing only the bottom-left portion of the video (zoomed/cropped). The same code works correctly on iOS. Setup let displayLayer = AVSampleBufferDisplayLayer() displayLayer.videoGravity = .resizeAspect // Host displayLayer as a sublayer of an NSView, enqueue CMSampleBuffers let source = AVPictureInPictureController.ContentSource( sampleBufferDisplayLayer: displayLayer, playbackDelegate: self ) let pip = AVPictureInPictureController(contentSource: source) pip.delegate = self The source display layer is 1280×720, matching the video stream resolution. PiP starts successfully — isPictureInPicturePossible is true, the PiP

Media Technologies General AVKit AVFoundation

261

Apr ’26

Reply to NSLocationTemporaryUsageDescriptionDictionary crashes Xcode 13

Xcode 26.4 still crashes. It's hard to believe this bug was reported so long ago, yet Xcode hasn't fixed it after so many versions 😓

Developer Tools & Services Xcode

Apr ’26

Notarization submissions stuck "In Progress" for 24+ hours - new team first submissions

Hi, I'm notarizing my Electron macOS app (DMG) for the first time with our new Developer ID, and most submissions have been stuck in In Progress for over 24 hours. Environment: Team ID: BSS9KAH6Z2 Certificate: Developer ID Application (valid until 2031) Tool: xcrun notarytool submit (Xcode CLI) App: Electron 28, signed with hardened runtime File: DMG (~131MB), 104 files inside .app What happened: Total 19 submissions over the past 24 hours Only 4 were Accepted (2 DMGs + 2 zips) The other 15 are still In Progress with no log available The 4 Accepted ones took 1~1.5 hours each codesign --verify --deep --strict passes with no issues Accepted submission log shows issues: null Apple System Status shows Developer ID Notary Service: Available What I've tried: Submitting as DMG directly Submitting as ditto zip of .app Submitting via electron-builder's built-in notarize Using both app-specific password and keychain profile auth Verified entitlements (allow-jit, disable-library-validation) Since some submissio

Code Signing Notarization Notarization Code Signing

481

Apr ’26

Reply to iOS 26 TabBar Remove Selected Capsule

Thanks for the post. Any chance you can provide a simple focused project we can download and run it to see what you are seeing? If so, please share a link to your test project. That'll help us better understand what's going on. If you're not familiar with preparing a test project, take a look at Creating a test project. What happens when you disable Liquid Glass? Do you get the results that you want? When you create a standard UIView (or SwiftUI View) that contains your custom buttons and layout and add custom view to the UITabBarController's view and anchor it to the bottom of the screen. When a user taps a button in your custom view, manually update the selected tab is when you get that result? Are you testing on iOS 26.4? What Xcode version are you using? Albert Pascual   Worldwide Developer Relations.

UI Frameworks UIKit

Apr ’26