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CPListItem setImage: causes 29-second main thread hang on iOS 26.4 due to CoreUI performance regression
We're experiencing a severe main thread hang (29 seconds) in our CarPlay audio app when calling [CPListItem setImage:] on iOS 26.4. This issue affects 81% of our reported hang cases, and is concentrated on iOS 26.4. Environment iOS 26.4 CarPlay Audio app Images are downloaded via SDWebImage, resized to appropriate scale, then set via [CPListItem setImage:] on the main thread Problem When multiple list item images finish downloading around the same time, each setImage: call triggers expensive synchronous CoreUI operations on the main thread. The total accumulated time causes a 29-second freeze. The entire hang occurs inside Apple frameworks — no app code is on the hot path after calling setImage:. Call Stack (simplified) [CPListItem setImage:] └─ [CPImageSet initWithImage:treatmentBlock:] (57% + 21% + 18% = 96%) └─ [UIImageAsset imageWithTraitCollection:] └─ [UIImageAsset _withLock_imageWithConfiguration:] └─ [UIImageAsset _performLookUpRegisteredObjectForTraitCollection:] └─ [UITraitCollection _enume
Topic: UI Frameworks SubTopic: UIKit
1
0
68
Apr ’26
ManipulationComponent Not Translating using indirect input
When using the new RealityKit Manipulation Component on Entities, indirect input will never translate the entity - no matter what settings are applied. Direct manipulation works as expected for both translation and rotation. Is this intended behaviour? This is different from how indirect manipulation works on Model3D. How else can we get translation from this component? visionOS 26 Beta 2 Build from macOS 26 Beta 2 and Xcode 26 Beta 2 Attached is replicable sample code, I have tried this in other projects with the same results. var body: some View { RealityView { content in // Add the initial RealityKit content if let immersiveContentEntity = try? await Entity(named: MovieFilmReel, in: reelRCPBundle) { ManipulationComponent.configureEntity(immersiveContentEntity, allowedInputTypes: .all, collisionShapes: [ShapeResource.generateBox(width: 0.2, height: 0.2, depth: 0.2)]) immersiveContentEntity.position.y = 1 immersiveContentEntity.position.z = -0.5 var mc = ManipulationComponent() mc.releaseBehavior =
17
0
3.2k
Apr ’26
Initial presentation of popover hangs when shown from a button in the toolbar
I have a simple reproducer here: struct ContentView: View { @State private var isOn = false @State private var isPresented = false var body: some View { NavigationStack { Color.blue .toolbar { ToolbarItem(placement: .topBarTrailing) { Button(Press here) { isPresented = true } .popover(isPresented: $isPresented) { Color.green .frame(idealWidth: 400, idealHeight: 500) .presentationCompactAdaptation(.popover) } } } } } } When I tap on the button in the toolbar you can see there is a hang then the popover shows. Then every time after there is no longer a hang so this seems like a bug. Any ideas? I'm using Xcode 26.3 and a iPad Pro 13-inch (M5) (26.4) simulator.
3
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198
Apr ’26
26.4 beta and RC versions are unable to be created on anything but 26.4 beta host OS
We're trying to create 26.4 beta and RC VMs on 15.x and 26.3 host OS' without success. We see Tue Mar 17 17:27:36 40 anka.log (install) 45803: failed to install macOS: Error Domain=VZErrorDomain Code=10006 Installation requires a software update. UserInfo={NSLocalizedFailure=A software update is required to complete the installation., NSLocalizedFailureReason=Installation requires a software update.} Yet, if we create it the same way on 26.4 beta host OS, it works. We've tried the usual tricks of installing latest Xcode and preparing it (accepting license, etc). But, they don't work on 26.3 and 15.x. What's the trick to get the creation of 26.4 to work on <= 26.3 host OS?
19
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900
Apr ’26
Reply to How does Associated Domains Development works on watchOS?
Thanks @kelin Yeah in Apple Watch there are still a few limitations. There is a good documentation to see the difference and how to test per device: https://developer.apple.com/documentation/xcode/allowing-apps-and-websites-to-link-to-your-content/#Support-universal-links openSystemURL(_:) in watchOS I think you finding the limitations of what app will open. I would recommend to fill an enhancement request for the watch if you want to behave like an iOS device: If you're not familiar with how to file enhancement requests, take a look at Bug Reporting: How and Why? Albert Pascual
  Worldwide Developer Relations.
Topic: App & System Services SubTopic: General Tags:
Apr ’26
Reply to Using mTLS with YubiKey via USB-C and PIV
OK, you’re definitely on the right path here. [quote='883659022, RobJones, /thread/821896?answerId=883659022#883659022, /profile/RobJones'] it works ONLY WITH my enterprise provisioning profile. [/quote] Interesting. I didn’t expect to see a difference between team types here, because Developer Account Help > Reference > Supported capabilities (iOS) says that Keychain Sharing is available for all three team. However, I tested this and discovered a discrepancy. Specifically, I created a test project with two app targets: Individual, signed by the Individual team I use for testing (SKMME9E2Y8) PersonalTeam, signed by the Personal Team I use for testing (SKMME9E2Y8) Note Personal Team is the term that Xcode uses for Apple’s free provisioning feature. It corresponds to the Apple Developer column in the table I referenced earlier. In contrast, an Individual team is covered by the ADP column. I then added the Keychain Sharing capability to both, built them for the device, and then dumped the profiles
Topic: Privacy & Security SubTopic: General Tags:
Apr ’26
Reply to How to add icon and thumbnail image for a Screensaver ?
[quote='883691022, akadeepsh, /thread/806641?answerId=883691022#883691022, /profile/akadeepsh'] isn't there any way to add a thumbnail to replace the blue swirl galaxy? [/quote] (Negative question. Tricky!) AFAIK there’s no supported way to replace the default thumbnail. [quote='883691022, akadeepsh, /thread/806641?answerId=883691022#883691022, /profile/akadeepsh'] I haven't signed any screensaver before so i have no idea. [/quote] I presume you’re distributing it directly? If so, you’ll need to use Developer ID signing. I have a couple of key points about that: Developer ID signing identities are precious, so you need to manage them carefully. See The Care and Feeding of Developer ID. If you’re using Xcode, be aware that the organiser can only export apps. If your distribute a standalone screen saver — rather than, say, nesting it within an app — then you’ll need to manually export and re-sign the screen saver from your Xcode archive. For more on how to do that, see Creating distribution-si
Topic: App & System Services SubTopic: General Tags:
Apr ’26
Background UDP receive for lighting control (Art-Net/sACN)
I'm developing a lighting control app for iOS that receives Art-Net (UDP port 6454) and sACN (UDP port 5568) packets from a lighting console and relays commands to BLE wristbands with LEDs. This is used in live event production — the participant locks their phone while in a show and expects lighting control to continue uninterrupted. The problem UDP receive stops reliably ~30 seconds after the screen locks. I understand this is by design - iOS suspends apps in the background. However, I'm trying to understand if any supported path exists for this use case. What I've already tried UIRequiresPersistentWiFi = true - helps with Wi-Fi association but doesn't prevent app suspension Silent AVAudioEngine loop with UIBackgroundModes: audio - keeps the app alive, works in testing, but risks App Store rejection and feels like an abuse of the audio background mode NWListener (Network framework) on the UDP port - same suspension behaviour Socket rebind on applicationWillEnterForeground - recovers after resume but doesn't
1
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84
Apr ’26
First-time notarization submissions stuck "In Progress" for 24+ hours — Electron app
Hi, All notarization submissions for our new Electron macOS app have been stuck in In Progress for over 24 hours, with no logs available. Environment: Team ID: T7632V8V2D Certificate: Developer ID Application (valid, identity 83AC47F44D984509D5530439DD32729076B84982) Tool: xcrun notarytool submit (Xcode CLI) App: Electron 33, signed with hardened runtime, entitlements include allow-jit and allow-unsigned-executable-memory File: zip of .app (~236MB for arm64, ~104MB for x64) codesign --verify --deep --strict passes with no issues Apple System Status shows Developer ID Notary Service: Available Stuck submissions (all In Progress, no logs available): ea0fd8d4-1f2d-4266-aa84-aa3f3ba9a8fb (Apr 8, 09:40 UTC) dfaacdd2-1a11-4844-b8b7-b07bae809a7b (Apr 7, 16:49 UTC) 8256e1f0-e501-4423-8744-35b5b78ec87f (Apr 7, 10:32 UTC) a477d536-d84a-4c25-99ca-d125e0a22de1 (Apr 7, 09:07 UTC) This is our first time notarizing any app on this developer account. We understand first-time submissions may be routed to in-depth ana
1
0
275
Apr ’26
Paired Watch not appearing in Xcode
I managed to install watchOS 2 without having registered my Watch's UDID, but as it's part of the instructions for installing watchOS betas I thought I'd better do it now in case beta 2 bricks my Watch or something.However, the Watch isn't appearing in Xcode. I've tried both the latest public release and Xcode 7 beta, but there's no paired devices section under my iPhone when I connect it to Xcode and look in the Devices window.
9
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11k
Apr ’26
Updating Apps on the AppStore no longer working for me.
I have been using Swift Playground to build and submit my apps to the appstore for around three years now. Recently I uploaded two of my apps but now when I submit them for approval an error is issued… “Unable to Add for Review”… (see pic attached). I don’t understand it because Playground does not use Xcode as far as I am aware? Can someone advise me what I can do to resolve this? Is it something I have to wait to be fixed by an Apple update?
10
0
525
Apr ’26
Team ID "" is not associated with an active membership
I’m blocked from building an iOS app because Apple Developer Portal says my Team ID is not associated with an active membership. On the Apple Developer portal resources page I see: “Team ID: ‘’ is not associated with an active membership.” I don’t see a Team selector in the Developer portal (only Account / Help / Sign out). The portal shows a banner “Join the Apple Developer Program”. When I click it: “Sorry, you can’t enroll at this time. Your Apple Account is already associated with the Account Holder of a membership.” In App Store Connect → Users and Access, the only user is my Apple ID and it shows: Role: Account Holder, Admin Apps: All Apps Because of this, my iOS build/signing fails (Expo/EAS build, but same in Xcode) with: Provisioning profile doesn’t support Push Notifications capability Provisioning profile doesn’t include the aps-environment entitlement I enabled Push Notifications / tried regenerating provisioning profiles, but it keeps reusing the same old App Store profile and fails. Que
2
0
160
Apr ’26
CPListItem setImage: causes 29-second main thread hang on iOS 26.4 due to CoreUI performance regression
We're experiencing a severe main thread hang (29 seconds) in our CarPlay audio app when calling [CPListItem setImage:] on iOS 26.4. This issue affects 81% of our reported hang cases, and is concentrated on iOS 26.4. Environment iOS 26.4 CarPlay Audio app Images are downloaded via SDWebImage, resized to appropriate scale, then set via [CPListItem setImage:] on the main thread Problem When multiple list item images finish downloading around the same time, each setImage: call triggers expensive synchronous CoreUI operations on the main thread. The total accumulated time causes a 29-second freeze. The entire hang occurs inside Apple frameworks — no app code is on the hot path after calling setImage:. Call Stack (simplified) [CPListItem setImage:] └─ [CPImageSet initWithImage:treatmentBlock:] (57% + 21% + 18% = 96%) └─ [UIImageAsset imageWithTraitCollection:] └─ [UIImageAsset _withLock_imageWithConfiguration:] └─ [UIImageAsset _performLookUpRegisteredObjectForTraitCollection:] └─ [UITraitCollection _enume
Topic: UI Frameworks SubTopic: UIKit
Replies
1
Boosts
0
Views
68
Activity
Apr ’26
ManipulationComponent Not Translating using indirect input
When using the new RealityKit Manipulation Component on Entities, indirect input will never translate the entity - no matter what settings are applied. Direct manipulation works as expected for both translation and rotation. Is this intended behaviour? This is different from how indirect manipulation works on Model3D. How else can we get translation from this component? visionOS 26 Beta 2 Build from macOS 26 Beta 2 and Xcode 26 Beta 2 Attached is replicable sample code, I have tried this in other projects with the same results. var body: some View { RealityView { content in // Add the initial RealityKit content if let immersiveContentEntity = try? await Entity(named: MovieFilmReel, in: reelRCPBundle) { ManipulationComponent.configureEntity(immersiveContentEntity, allowedInputTypes: .all, collisionShapes: [ShapeResource.generateBox(width: 0.2, height: 0.2, depth: 0.2)]) immersiveContentEntity.position.y = 1 immersiveContentEntity.position.z = -0.5 var mc = ManipulationComponent() mc.releaseBehavior =
Replies
17
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0
Views
3.2k
Activity
Apr ’26
Initial presentation of popover hangs when shown from a button in the toolbar
I have a simple reproducer here: struct ContentView: View { @State private var isOn = false @State private var isPresented = false var body: some View { NavigationStack { Color.blue .toolbar { ToolbarItem(placement: .topBarTrailing) { Button(Press here) { isPresented = true } .popover(isPresented: $isPresented) { Color.green .frame(idealWidth: 400, idealHeight: 500) .presentationCompactAdaptation(.popover) } } } } } } When I tap on the button in the toolbar you can see there is a hang then the popover shows. Then every time after there is no longer a hang so this seems like a bug. Any ideas? I'm using Xcode 26.3 and a iPad Pro 13-inch (M5) (26.4) simulator.
Replies
3
Boosts
0
Views
198
Activity
Apr ’26
26.4 beta and RC versions are unable to be created on anything but 26.4 beta host OS
We're trying to create 26.4 beta and RC VMs on 15.x and 26.3 host OS' without success. We see Tue Mar 17 17:27:36 40 anka.log (install) 45803: failed to install macOS: Error Domain=VZErrorDomain Code=10006 Installation requires a software update. UserInfo={NSLocalizedFailure=A software update is required to complete the installation., NSLocalizedFailureReason=Installation requires a software update.} Yet, if we create it the same way on 26.4 beta host OS, it works. We've tried the usual tricks of installing latest Xcode and preparing it (accepting license, etc). But, they don't work on 26.3 and 15.x. What's the trick to get the creation of 26.4 to work on <= 26.3 host OS?
Replies
19
Boosts
0
Views
900
Activity
Apr ’26
Reply to How does Associated Domains Development works on watchOS?
Thanks @kelin Yeah in Apple Watch there are still a few limitations. There is a good documentation to see the difference and how to test per device: https://developer.apple.com/documentation/xcode/allowing-apps-and-websites-to-link-to-your-content/#Support-universal-links openSystemURL(_:) in watchOS I think you finding the limitations of what app will open. I would recommend to fill an enhancement request for the watch if you want to behave like an iOS device: If you're not familiar with how to file enhancement requests, take a look at Bug Reporting: How and Why? Albert Pascual
  Worldwide Developer Relations.
Topic: App & System Services SubTopic: General Tags:
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Activity
Apr ’26
Reply to error build: Command SwiftCompile failed with a nonzero exit code
@MMarcin Thanks for the post, this thread is 2 years old, would you mind to create a new thread and post the version of Xcode you are using as well as the errors you are getting in the console? Thanks Albert
  Worldwide Developer Relations.
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Activity
Apr ’26
Reply to Using mTLS with YubiKey via USB-C and PIV
OK, you’re definitely on the right path here. [quote='883659022, RobJones, /thread/821896?answerId=883659022#883659022, /profile/RobJones'] it works ONLY WITH my enterprise provisioning profile. [/quote] Interesting. I didn’t expect to see a difference between team types here, because Developer Account Help > Reference > Supported capabilities (iOS) says that Keychain Sharing is available for all three team. However, I tested this and discovered a discrepancy. Specifically, I created a test project with two app targets: Individual, signed by the Individual team I use for testing (SKMME9E2Y8) PersonalTeam, signed by the Personal Team I use for testing (SKMME9E2Y8) Note Personal Team is the term that Xcode uses for Apple’s free provisioning feature. It corresponds to the Apple Developer column in the table I referenced earlier. In contrast, an Individual team is covered by the ADP column. I then added the Keychain Sharing capability to both, built them for the device, and then dumped the profiles
Topic: Privacy & Security SubTopic: General Tags:
Replies
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Views
Activity
Apr ’26
Reply to How to add icon and thumbnail image for a Screensaver ?
[quote='883691022, akadeepsh, /thread/806641?answerId=883691022#883691022, /profile/akadeepsh'] isn't there any way to add a thumbnail to replace the blue swirl galaxy? [/quote] (Negative question. Tricky!) AFAIK there’s no supported way to replace the default thumbnail. [quote='883691022, akadeepsh, /thread/806641?answerId=883691022#883691022, /profile/akadeepsh'] I haven't signed any screensaver before so i have no idea. [/quote] I presume you’re distributing it directly? If so, you’ll need to use Developer ID signing. I have a couple of key points about that: Developer ID signing identities are precious, so you need to manage them carefully. See The Care and Feeding of Developer ID. If you’re using Xcode, be aware that the organiser can only export apps. If your distribute a standalone screen saver — rather than, say, nesting it within an app — then you’ll need to manually export and re-sign the screen saver from your Xcode archive. For more on how to do that, see Creating distribution-si
Topic: App & System Services SubTopic: General Tags:
Replies
Boosts
Views
Activity
Apr ’26
Background UDP receive for lighting control (Art-Net/sACN)
I'm developing a lighting control app for iOS that receives Art-Net (UDP port 6454) and sACN (UDP port 5568) packets from a lighting console and relays commands to BLE wristbands with LEDs. This is used in live event production — the participant locks their phone while in a show and expects lighting control to continue uninterrupted. The problem UDP receive stops reliably ~30 seconds after the screen locks. I understand this is by design - iOS suspends apps in the background. However, I'm trying to understand if any supported path exists for this use case. What I've already tried UIRequiresPersistentWiFi = true - helps with Wi-Fi association but doesn't prevent app suspension Silent AVAudioEngine loop with UIBackgroundModes: audio - keeps the app alive, works in testing, but risks App Store rejection and feels like an abuse of the audio background mode NWListener (Network framework) on the UDP port - same suspension behaviour Socket rebind on applicationWillEnterForeground - recovers after resume but doesn't
Replies
1
Boosts
0
Views
84
Activity
Apr ’26
First-time notarization submissions stuck "In Progress" for 24+ hours — Electron app
Hi, All notarization submissions for our new Electron macOS app have been stuck in In Progress for over 24 hours, with no logs available. Environment: Team ID: T7632V8V2D Certificate: Developer ID Application (valid, identity 83AC47F44D984509D5530439DD32729076B84982) Tool: xcrun notarytool submit (Xcode CLI) App: Electron 33, signed with hardened runtime, entitlements include allow-jit and allow-unsigned-executable-memory File: zip of .app (~236MB for arm64, ~104MB for x64) codesign --verify --deep --strict passes with no issues Apple System Status shows Developer ID Notary Service: Available Stuck submissions (all In Progress, no logs available): ea0fd8d4-1f2d-4266-aa84-aa3f3ba9a8fb (Apr 8, 09:40 UTC) dfaacdd2-1a11-4844-b8b7-b07bae809a7b (Apr 7, 16:49 UTC) 8256e1f0-e501-4423-8744-35b5b78ec87f (Apr 7, 10:32 UTC) a477d536-d84a-4c25-99ca-d125e0a22de1 (Apr 7, 09:07 UTC) This is our first time notarizing any app on this developer account. We understand first-time submissions may be routed to in-depth ana
Replies
1
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0
Views
275
Activity
Apr ’26
Paired Watch not appearing in Xcode
I managed to install watchOS 2 without having registered my Watch's UDID, but as it's part of the instructions for installing watchOS betas I thought I'd better do it now in case beta 2 bricks my Watch or something.However, the Watch isn't appearing in Xcode. I've tried both the latest public release and Xcode 7 beta, but there's no paired devices section under my iPhone when I connect it to Xcode and look in the Devices window.
Replies
9
Boosts
0
Views
11k
Activity
Apr ’26
Reply to Paired Watch not appearing in Xcode
It is useful to re-pair the watch after it has been unpaired. After I did this operation, it could be displayed in Xcode.
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Activity
Apr ’26
Updating Apps on the AppStore no longer working for me.
I have been using Swift Playground to build and submit my apps to the appstore for around three years now. Recently I uploaded two of my apps but now when I submit them for approval an error is issued… “Unable to Add for Review”… (see pic attached). I don’t understand it because Playground does not use Xcode as far as I am aware? Can someone advise me what I can do to resolve this? Is it something I have to wait to be fixed by an Apple update?
Replies
10
Boosts
0
Views
525
Activity
Apr ’26
Reply to Xcode 26.4 rc
Same here, Xcode Version 26.4 (17E192) Very frustrating experience. Submitted: FB22452094
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Activity
Apr ’26
Team ID "" is not associated with an active membership
I’m blocked from building an iOS app because Apple Developer Portal says my Team ID is not associated with an active membership. On the Apple Developer portal resources page I see: “Team ID: ‘’ is not associated with an active membership.” I don’t see a Team selector in the Developer portal (only Account / Help / Sign out). The portal shows a banner “Join the Apple Developer Program”. When I click it: “Sorry, you can’t enroll at this time. Your Apple Account is already associated with the Account Holder of a membership.” In App Store Connect → Users and Access, the only user is my Apple ID and it shows: Role: Account Holder, Admin Apps: All Apps Because of this, my iOS build/signing fails (Expo/EAS build, but same in Xcode) with: Provisioning profile doesn’t support Push Notifications capability Provisioning profile doesn’t include the aps-environment entitlement I enabled Push Notifications / tried regenerating provisioning profiles, but it keeps reusing the same old App Store profile and fails. Que
Replies
2
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0
Views
160
Activity
Apr ’26