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A Summary of the WWDC25 Group Lab

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Reply to Canvas Preview: Cannot preview in this file
On my Mac mini M4 Pro, I’ve installed macOS Tahoe 26.0 and Xcode 26.0.1. The error message still appears, even when testing with the iPhone 17 Pro and iPad Pro 11-inch M4 simulators. The FB numer is: FB20362054 == PREVIEW UPDATE ERROR: GroupRecordingError Error encountered during update group #19 ================================== | FailedToLaunchAppError: Failed to launch net.thomasbayer.ChatPrototype | | ================================== | | | [Remote] JITError | | | | ================================== | | | | | [Remote] CouldNotLoadInputObjectFile: Could not load object file during preview: /Users/thomas/Library/Developer/Xcode/DerivedData/ChatPrototype-ebbbmisjgapzykawaadxudtxyjmg/Build/Intermediates.noindex/ChatPrototype.build/Debug-iphonesimulator/ChatPrototype.build/Objects-normal/arm64/ChatPrototypeApp.o | | | | | | path: /Users/thomas/Library/Developer/Xcode/DerivedData/ChatPrototype-ebbbmisjgapzykawaadxudtxyjmg/Build/Intermediates.noindex/ChatPrototype.build/Debug-iphonesimulator/ChatProt
Topic: UI Frameworks SubTopic: SwiftUI
Sep ’25
iOS 26: Interface orientation controls ignored on iPad - shouldAutorotate and supportedInterfaceOrientations not respected
Summary: On iOS 26.0, iPad apps ignore standard interface orientation controls (shouldAutorotate, supportedInterfaceOrientations, Info.plist settings) and rotate to landscape despite being configured for portrait-only. Steps to Reproduce: Create iPad app with portrait-only configuration Implement shouldAutorotate returning NO Implement supportedInterfaceOrientations returning UIInterfaceOrientationMaskPortrait Set Info.plist UISupportedInterfaceOrientations~ipad to UIInterfaceOrientationPortrait only Run on iPad with iOS 26.0 Rotate device physically Expected Result: App should remain locked in portrait orientation Actual Result: Entire app interface rotates to landscape, ignoring all orientation controls Additional Information: Same code works correctly on iOS 18.4 (stays portrait-only) Problem affects entire UI including status bar and all view controllers All standard orientation control methods are implemented correctly Issue occurs on both simulator and physical devices Code Sample: objc -(BOOL)
Topic: UI Frameworks SubTopic: UIKit
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Sep ’25
Reply to CloudKit Subscriptions Not Triggering Push Notifications - No NotificationSend Events
CloudKit Push Notifications Not Delivering - Extensive Debugging Completed Issue Summary CloudKit subscriptions are properly configured and triggering, but push notifications are never delivered to devices. After extensive debugging, I've isolated the issue to CloudKit→APNS delivery failure. Environment Xcode: 15.x iOS Target: 17.0+ watchOS Target: 10.0+ CloudKit Database: Both Public and Private Testing Devices: iPhone 15 Pro, Apple Watch Series 9 Environments Tested: Development and Production What's Working ✅ 1. CloudKit Subscriptions All 6 subscription types successfully created and visible in CloudKit Dashboard Subscriptions persist across app launches (verified in dashboard) Subscription predicates correctly configured for each record type: // Example: FriendRequest subscription NSPredicate(format: toUser == %@, userRecordID) // Example: Challenge subscription NSPredicate(format: recipientID == %@ AND status == %@, userRecordID, pending) 2. Device Registration • App successfully requests and re
Sep ’25
Consumable ticket sharing within groups
Hello, I would like to ask for your opinion on whether the following in-app purchase (IAP) specifications would comply with the App Store Review Guidelines. ■ App Overview ・The app allows users to create a “Family Group” by inviting other family members to join. ・The app provides brain-training games. The game itself is displayed via WebView. ・All purchases use in-app purchase (IAP) only. No external payments or links are provided. ■ Purchase Types (2 models) ① Group Unlimited Plan ・If one member of a family group purchases this plan, all members of the same group can play the games without limits for a certain period. ・This is based on the app’s own group-sharing mechanism, not Apple’s “Family Sharing.” We will clearly state this in the UI to avoid confusion. ② Ticket System (Consumable) ・One user in the group purchases game-play tickets. ・Other members of the same group can also consume those tickets to play. ・Tickets are only shared and consume
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Sep ’25
Consumable ticket sharing within groups
Hello, I would like to ask for your opinion on whether the following in-app purchase (IAP) specifications would comply with the App Store Review Guidelines. ■ App Overview ・The app allows users to create a “Family Group” by inviting other family members to join. ・The app provides brain-training games. The game itself is displayed via WebView. ・All purchases use in-app purchase (IAP) only. No external payments or links are provided. ■ Purchase Types (2 models) ① Group Unlimited Plan ・If one member of a family group purchases this plan, all members of the same group can play the games without limits for a certain period. ・This is based on the app’s own group-sharing mechanism, not Apple’s “Family Sharing.” We will clearly state this in the UI to avoid confusion. ② Ticket System (Consumable) ・One user in the group purchases game-play tickets. ・Other members of the same group can also consume those tickets to play. ・Tickets are only shared and consume
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Sep ’25
Reply to Shared directories as ROOTFS in Linux VM causes file permission issues
Hello, I’m experiencing a very unusual problem when using VirtioFS with the Apple Virtualization Framework and Docker, through tools such as Lima and Tart. I’ve described the full details here: lima-vm/lima#4053 (comment), but here’s a quick summary. Steps to Reproduce Given a directory structure like this: mkdir -p local-test-dir/dir and running the following command: docker run -u $(id -u) --rm -v $PWD/dir:/mnt/dir alpine:latest sh -c ls -al /mnt the output is: total 8 drwxr-xr-x 1 root root 4096 Sep 23 22:48 . drwxr-xr-x 1 root root 4096 Sep 23 22:48 .. drwxr-xr-x 2 root root 64 Sep 19 21:34 dir # <-- INCORRECT The directory appears as root:root, which is wrong. Workaround If I add an artificial sleep of more than 0.9s before listing the directory, the issue disappears: docker run -u 501 --rm -v $PWD/dir:/mnt/dir alpine:latest sh -c sleep 0.9; ls -al /mnt Output: total 8 drwxr-xr-x 1 root root 4096 Sep 23 22:48 . drwxr-xr-x 1 root root 4096 Sep 23 22:48 .. drwxr-xr-x 2 501 root 64 Sep 19 21:34
Topic: App & System Services SubTopic: Core OS Tags:
Sep ’25
Analysis of issues on Safari with liquid glass
Hello, As previous reports have already shown, there seems to be a few issues on the latest version of Safari, mainly around: Modals taking up the full viewport Elements positioned at the bottom of the screen This also seems to affect the modals on apple.com/iphone. I've recently done an analysis of what can and can't be done in code to work with the new liquid glass UI and thought I'd share my findings here. The full write up, along with screenshots and the demos I used are available in this repository: https://github.com/stevenocchipinti/liquid-glass-spike A brief summary of the findings: The conditions for a fullscreen modal overlay element to cover the entire screen with a position: fixed; seems to be: The background must be semi-transparent Solid colours, linear-gradients, etc. don't work The container must be empty This also means the standard and ::backdrop don't seem to work. The conditions for a bottom sheet to cover the entire screen, including the area around the Safari toolbar seems to be
Topic: Safari & Web SubTopic: General Tags:
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Sep ’25
Reply to Does Apple Spatial Audio Format documentation exist
Hello @Plight , thank you for your question! First, could you please share more about what you are trying to do in your app? Its difficult to give advice on workflows without knowing exactly what kind of experience you are trying to create. Most of our existing documentation is going to be from WWDC videos, like the one you linked above, and the documentation website for specific APIs. Here's another WWDC25 video where we go over the Apple Positional Audio Codec (APAC) near the end: Learn about the Apple Projected Media Profile. It provides an example of how to author an audio file using AVAssetWriter. Davinci Resolve is currently capable of authoring ambisonic ASAF content, so I recommend investigating that tool to see if it meets your needs. Additionally, Resolve should be cabable of encoding an ASAF master wav file into APAC. The Compressor app also has this functionality. You can use the AVPlayer API to playback ASAF content in your app. This is available on a VideoMaterial for example. Please se
Sep ’25
Reply to Does Apple Spatial Audio Format documentation exist
Hello @Plight, thank you for your question! First, could you please share more about what you are trying to do in your app? Its difficult to give advice on workflows without knowing exactly what kind of experience you are trying to create. Most of our existing documentation is going to be from WWDC videos, like the one you linked above, and the documentation website for specific APIs. Here's another WWDC25 video where we go over the Apple Positional Audio Codec (APAC) near the end: Learn about the Apple Projected Media Profile. It provides an example of how to author an audio file using AVAssetWriter. Davinci Resolve is currently capable of authoring ambisonic ASAF content, so I recommend investigating that tool to see if it meets your needs. Additionally, Resolve should be cabable of encoding an ASAF master wav file into APAC. The Compressor app also has this functionality. You can use the AVPlayer API to playback ASAF content in your app. This is available on a VideoMaterial for example. Please sen
Sep ’25
Reply to NSDocument doesn't autosave last changes
In your case, the changes in your text view don't go to the undo stack Only the last changes, all previous other changes do as expected. save the document as needed That is what I'm wondering about. What is the correct way of nudging the undo mechanism so that autosaving would see the document as dirty? We already saw that simply calling updateChangeCount(_:) breaks the undo mechanism. though AppKit folks may see the current behavior, which skips the save for a clean document when terminating the app, as correct Skipping save for a clean document is correct in my opinion as well, but the problem is that the document should not be clean in this case, and the question is how it should correctly be marked as dirty without breaking the undo mechanism. The text view probably has an open undo group (waiting for more text to be inserted) that should be closed when trying to quit the app, so that the document is then correctly marked as dirty.
Topic: UI Frameworks SubTopic: AppKit Tags:
Sep ’25
Reply to AppGroups data loss after App transfer and App update.
The app group that was formerly used to store data while the app was distributed with the other developer's account will have the other developer's App ID Prefix and will not be accessible from your account. App groups you create in your account will have your account's App ID prefix and data stored using them will be private to your account.
Topic: Code Signing SubTopic: Entitlements Tags:
Sep ’25
AppGroups data loss after App transfer and App update.
Hi, I just released a new version of an app that was transferred from another developer account. The previous version of this app used the App Groups feature to store some important data, and I would like to retrieve that data. In the new version, I’m using the same bundle identifier and the same App Group ID (which has already been deleted from the original developer account). I also added the App Groups entitlement in the project settings and set the same App Group ID. However, I still cannot access the data in the App Group. From the documentation and issues I’ve found, it seems that an app should still have permission to access the same App Group after being transferred. Did I miss something? Thanks!
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Sep ’25