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Inconsistent VoIP Push Behavior Post Network Restoration
We are observing unexpected behavior in Apple Push Notification Service (APNS) delivery and would appreciate clarification and guidance. Below is a detailed breakdown of the scenario and related questions. Abbreviations: APNP – Apple Push Notification Provider APNS – Apple Push Notification Service Scenario: User1 is registered on iOS device1. Flight Mode is enabled on iOS device1. User2 initiates a call to User1 (Time t = 0 sec). User2 cancels the outgoing call after 5 seconds (Time t = 5 sec). Flight Mode is disabled on iOS device1 after 20 seconds (Time t = 25 sec). Observation: iOS device1 displays an incoming call notification (CallKit UI) after flight mode is turned off, despite the call being cancelled by User2. This notification disappears automatically after approximately 8–10 seconds. Logic Flow: At time t = 0, our APNP sends a VoIP push (priority) to APNS for the incoming call. Since device1 is in flight mode, APNS cannot deliver the push. At t = 25 sec, after flight mode is turned off, APNS delivers the cached VoIP push to device1. The app takes ~5 seconds to initialize (CSDK setup, SIP registration, etc.). It eventually receives a SIP NOTIFY with state="full" and empty dialog info (indicating no active call). Consequently, the CallKit incoming call is removed after ~8 seconds. Questions: → We set the apns-expiration header to 0, expecting that the VoIP push would not be delivered if the device was unreachable when the push was sent. However, APNS still delivers the push 20–30 seconds later, once the device is back online. Q. Why is the apns-expiration header not respected in this case? → Upon receiving the VoIP push, we require ~10–12 seconds to determine if a visible CallKit notification is still relevant (e.g., by completing SIP registration and checking for active dialogs). Q. Is it acceptable, per Apple guidelines, to intentionally delay showing the CallKit UI (incoming call) for 10–15 seconds after receiving the VoIP push? → Apple documentation states that the priority VoIP push channel should be used only for notifying incoming calls, while regular (non-VoIP) pushes should be used for other updates, including call cancellations. Q. What is the rationale behind discouraging the use of the priority VoIP push channel for call cancellation events? In some cases, immediate cancellation notification is as critical as the initial incoming call. Would Apple consider it acceptable to occasionally use the priority VoIP channel for rare call-cancellation scenarios without risking throttling or suspension? → In our implementation, we send an incoming call notification via the priority VoIP channel. Shortly after, we send a call cancellation notification on the regular push channel, marked with "content-available": 1. We expect this regular push to wake the app (triggering application:didReceiveRemoteNotification:fetchCompletionHandler:), but in practice the app never wakes, and our debug logs inside that delegate method never appear. Q. Under what exact conditions does a "content-available": 1 regular push fail to wake the app when it follows a VoIP push? Are there additional requirements (e.g., background modes, rate limits, power optimizations) that could prevent the delegate from being called? → According to Apple documentation: “APNs stores only one notification per bundle ID. When multiple notifications are sent to the same device for the same bundle ID, APNs keeps only the latest one.” However, in our tests: If a device is offline when APNs receives both: (a) a priority VoIP push for an incoming call, (b) a regular push for call cancellation (same bundle ID), Upon the device reconnecting, APNs still delivers the earlier VoIP push, instead of discarding it and delivering only the most recent (cancellation) notification. Q. Why doesn’t APNs replace the queued VoIP push with the newer regular push when both share the same bundle ID? Is this expected behavior due to channel type differences (VoIP vs. regular), or is there a way to ensure that the latest notification (even if regular) supersedes the earlier VoIP push? We’d appreciate your input or recommendations on handling such delayed pushes and any best practices for VoIP push expiration handling and call UI timing.
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106
Aug ’25
View lifecycle in Tabview
In TabView, when I open a view in a Tab, and I switch to another Tab, but the View lifecycle of the view in the old Tab is still not over, and the threads of some functions are still in the background. I want to completely end the View lifecycle of the View in the previously opened tab when switching Tab. How can I do it? Thank you!
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168
Jul ’25
ImageCreator fails with GenerationError Code=11 on Apple Intelligence-enabled device
When I ran the following code on a physical iPhone device that supports Apple Intelligence, I encountered the following error log. What does this internal error code mean? Image generation failed with NSError in a different domain: Error Domain=ImagePlaygroundInternal.ImageGeneration.GenerationError Code=11 “(null)”, returning a generic error instead let imageCreator = try await ImageCreator() let style = imageCreator.availableStyles.first ?? .animation let stream = imageCreator.images(for: [.text("cat")], style: style, limit: 1) for try await result in stream { // error: ImagePlayground.ImageCreator.Error.creationFailed _ = result.cgImage }
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284
Jul ’25
購入情報をサーバーで管理する場合は、アプリからサーバーに購入情報を渡す際にレシート検証する必要があるのか
アプリ内課金を実装しようとしていますが、サーバサイドのセキュリティに関してについて質問です。 StoreKit2を使えばアプリとApp Store Connect間のレシート検証は不要だが、 購入情報をサーバーで管理する場合は アプリからサーバーに購入情報を渡す際にレシート検証する必要があると考えるがその認識であっているか教えていただきたいです。
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93
May ’25
How to get a callback once a requested frameDuration change has been applied?
When changing a camera's exposure, AVFoundation provides a callback which offers the timestamp of the first frame captured with the new exposure duration: AVCaptureDevice.setExposureModeCustom(duration:, iso:, completionHandler:). I want to get a similar callback when changing frame duration. After setting AVCaptureDevice.activeVideoMinFrameDuration or AVCaptureDevice.activeVideoMinFrameDuration to a new value, how can I compute the index or the timestamp of the first camera frame which was captured using the newly set frame duration?
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522
Aug ’25
Glitching parts of screen since update to iOS 26 Developer Beta
As the title states, and it’s extremely frustrating. The floating bar that now appears above the keyboard is cool compared to the built in bar, though it seems to only work when it feels like it. Also the screen seems to have a haze around it, sometimes I cannot read whats needed because of it being blurred and it won’t allow me to navigate to certain things due to the haze being there too. Any way of rolling back my update and going back to my previous iOS?
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87
Jul ’25
How to start live activity in terminated state?
Hi everyone and Apple support, I’ve built an app that continuously runs and receives temperature data from a sensor. When a threshold is reached, I use Live Activities with the push notification flow to display alerts on the Dynamic Island. The Live Activity and push notification flow work fine in foreground and background states. However, I’m trying to support push-triggered Live Activities when the app is in the terminated state. Since my app rarely terminates, I can’t confirm if the Live Activity push token is generated in that state. It seems like it isn’t, which blocks the Live Activity from starting via push. I tried with both pushtostarttoken and pushtostarttokenupdates. None of them worked. Has anyone dealt with this or found a workaround to ensure the push token is available even when the app is terminated?
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146
Jul ’25
iOS 26 - Touch in context menu preview not working anymore
Hello, I am testing an existing app on iOS 26. It hast an UITableViewController that shows a custom context menu preview using previewForHighlightingContextMenuWithConfiguration and providing an UITargetedPreview. Something along the lines like this (shortened): public override func tableView(_ tableView: UITableView, previewForHighlightingContextMenuWithConfiguration configuration: UIContextMenuConfiguration) -> UITargetedPreview? { guard let indexPath = configuration.identifier as? NSIndexPath else { return nil } let previewTableViewCell = self.getCell(for: indexPath) var cellHeight = self.getCellHeight(for: indexPath, with: maxTextWidth) // Use the contentView of the UITableViewCell as a preview view let previewMessageView = previewTableViewCell.contentView previewMessageView.frame = CGRect(x: 0, y: 0, width: maxPreviewWidth, height: cellHeight) previewMessageView.layer.masksToBounds = true let accessoryView = ... let totalAccessoryFrameHeight = accessoryView.frame.maxY - cellHeight var containerView = UIView(frame: .init(x: 0, y: 0, width: Int(maxPreviewWidth), height: Int(cellHeight + totalAccessoryFrameHeight))) containerView.backgroundColor = .clear containerView.addSubview(previewMessageView) containerView.addSubview(accessoryView) // Create a preview target which allows us to have a transparent background let previewTarget = UIPreviewTarget(container: tableView, center: ...) let previewParameter = UIPreviewParameters() // Remove the background and the drop shadow from our custom preview view previewParameter.backgroundColor = .clear previewParameter.shadowPath = UIBezierPath() return UITargetedPreview(view: containerView, parameters: previewParameter, target: previewTarget) } On iOS 18 and below this works fine and buttons that are included in the accessoryView are tapable by the user. Now on iOS 26 the preview is shown correct (although it has a bit weird shadow animation), but tapping a button of the accessoryView now closes the context menu, without triggering the touchUpInside event anymore. For me it feels like an unintended change in behavior, but maybe I am missing something? Filed FB18644353
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376
Jul ’25
Strange network information values ​​in response to DeviceInformation command on iPad
I am checking the response of DeviceInformation Command to collect network information from iPad. On iPad(iPad Pro 11, M4) devices that use WiFi without inserting Usim or Esim, network values ​​such as CurrentMCC and ICCID are received in response to the DeviceInformation command. cf.)Even though it may be garbage value, I blurred the unique information just in case. <key>ServiceSubscriptions</key> <array> <dict> <key>CarrierSettingsVersion</key> <string>61.0</string> <key>CurrentCarrierNetwork</key> <string></string> <key>CurrentMCC</key> <string>450</string> <key>CurrentMNC</key> <string>08</string> <key>EID</key> <string>blah blah</string> <key>ICCID</key> <string>blah balh</string> <key>IMEI</key> <string>blah blah</string> <key>IsDataPreferred</key> <true/> <key>IsRoaming</key> <true/> <key>IsVoicePreferred</key> <false/> <key>Label</key> <string>Provisioning</string> <key>LabelID</key> <string>00000000-0000-0000-0000-000000000000</string> <key>PhoneNumber</key> <string></string> <key>Slot</key> <string>CTSubscriptionSlotOne</string> <key>SubscriberCarrierNetwork</key> <string>iPad</string> </dict> </array> This is a bit weird. If I collect the same information from an iPhone(iPhone 15 Pro Max) that only uses wifi and does not use Usim or Esim, it does not respond with values ​​like ICCID, CurrentMCC, etc. <key>ServiceSubscriptions</key> <array> <dict> <key>IMEI</key> <string>blah blah</string> <key>Slot</key> <string>CTSubscriptionSlotOne</string> </dict> <dict> <key>EID</key> <string>blah blah</string> <key>IMEI</key> <string>blah blah</string> <key>Slot</key> <string>CTSubscriptionSlotTwo</string> </dict> </array> I'm confused by the network information collected. Is there a reason why the collected network information of iPad and iPhone are different?
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243
Jun ’25
Glitch on buttons in all types of OS of Apple ecosystem
as a beta tester I am trying to explore the OS on multiple platforms like iO, iPadOS, MacOS, WatchOS. While on trying to use beta 1 have few issues and reported to Apple with analytics as I do for better improvements. But, in beta 2 there is an issue of glitches on UI. This also tried to report. But, while am trying record screen I can not see in that video after the screen record. But, in reality I can see that glitch with eyes. as everyone know without evidence we can not report the same with tickets properly and they also can not resolve the issues. It’s affecting on all types of OS platforms of Apple buttons and search positions etc. one more thing I absorbed is while am trying use overlay player and browse the safari or any apple developer apps which are full screen the devices are freezing and not responding and after hard restart those are starting after 10mins. As per my knowledge. Those are going through the memory overflow issue.
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194
Jul ’25
Xcode Crashing When Attempting to Distribute/Validate App in Organizer
I'm attempting to distribute a proprietary application (not released to the app store), and everytime I confirm the either validate or distribute in anyway Xcode crashes with no error message. I've seen a few posts regarding the agreements, but I have the free app agreement signed so that can't be it. I haven't had a problem previously with not having the paid agreement signed, but now i'm running into this issue. I've confirmed my ad-hoc profile and cert are all good and valid, so I'm unsure what else could be causing this issue. Not even getting prompted to submit a crash report.
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146
Jul ’25
Contact UISearchBar missing.
Feedback id: FB16140301 Below are the steps to reproduce the bug in Contacts app. Open Contacts app. Now search for a contact and didSelect that contact. Now slightly hold swipe right(from view's center leading position) as to pop the view but not fully swipe, now release the finger and you can see the back nav bar button missing and tapping the back button position also doesn't perform dismiss action. Now do fully swipe from left to right to dismiss(pop) current view. Here you can see the search bar missing.-> That's the bug.
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136
Jun ’25
How can you have a framework which uses a 3rd party dependency and an app that uses the framework and also the same dependency?
Is this setup possible / have a solution: There is a .xcframework F, which uses a 3rd party library, lets call it L. There is an app which uses the xcframework The app also uses L Both the app and F use SPM to integrate L F is using L for its own internal purposes. F is providing some functionality to the app. How it implements that ideally should be a black box from the app's perspective. The app also happens to use L for its own purposes. I can't get this set up working, always get warnings about duplicate symbols when running the App. This will presumably be due to the fact there are separate copies of L in both F and A. So how can that be eliminated? Can F not statically like to L and use the App's version of L at runtime? If so how can Xcode be configured so that F can actually compile? Or vice versa - can the App not statically link in its own copy of L and use that in the framework? If so, similar questions, how to configure Xcode to set this up? I can't believe this is an obscure use case, yet after days of searching and reading documentation I can't find any solution. Note that I was able to get this going when the app and the framework used Cocoapods to integrate L, but I just can't do similarly if the use of Cocoapods is replaced with SMP. When using cocoapods, within the frameworks Xcode section, the pods framework is set to Do Not Embed. This is probably the vital difference between the working Cocoapods implementation and the not working SPM solution. However, when using SPM Xcode doesn't present any option to either embed nor not embed the dependency. Why not? Can it somehow be set to not embed?
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90
Jun ’25
Live Caller ID Lookup - CipherMLError.missingSecre t Ke y error
I'm trying to implement live caller id PIR server in python and I have an issue related to evaluation key config. I don't receive the POST /key request even if I try to install the extension on new device and I had this error in device system logs: error 11:21:30.663022+0200 ciphermld requestData(byKeywords:shardIds:clientConfig:) threw an error: CipherML.CipherMLError.missingSecre t Ke y I think the reason why the evaluation key is not generated is related to this error but I'm not sure. It might be also related to HE params - I tried with the same params as in swift server example with plaintext_modulus=17 and it works, but for plaintext_modulus=65537 on the same device the system doesn't send me the evaluation key. Is there a limitation that restricts the evaluation key generation for some HE params? There is how the entire config object that I retrieve looks like: { "configs": { "Live-C aller-ID-Lookup. TestLiveCallerI D.iden tity": { "pir_config": { "encry ption_p aram eters": { "pol ynomial_deg ree": "4096", "plaint ext_mo dulus": "65537", "coeff icient_m oduli": [ "134176769", "268369921", "268361729" ], "secu rity_le vel": "SECU RITY LEVEL QUANT UM128", "h e_sc heme": "H E_SC HEM E_B F V" }, "shard_configs": [ { "num_entries": "2", "entry_size": "55991", "dimensions": [ "2", "1" ], "shard_id": "" } ], "keyword_pir_params": { "num_hash_functions": "2", "sharding_function": { "sha256": {} } }, "algorithm": "PIR _ALGO RITHM _MUL_PIR", "batch_size": "2", "evalu ation_ke config_hash": "" }, "config_id": "" } }, "key_info": [ { "timestamp": "1738660849", "key_config": { "encryp tion_par ameters": { "polynomial_degree": "4096", "plaintex t_mo dulus": "65537", "coeffic ient_m oduli": [ "134176769", "268369921", "268361729" ], "secu rity_level": "SECUR ITY_LEVEL_QU ANTUM128", "he_sc heme": "HE_SC HEME_BFV" }, "gal ois_e lements": [ 20 49, 40 97 ], "has _rel in_key": true } } ] } PS evaluation key data is just a placeholder, but anyway it should be skipped cause of expired timestamp More logs: ```language default 11:21:30.535865+0200 ciphermld Running rotation task for ["Live-Caller-ID-Lookup.TestLiveCallerID.identity"] info 11:21:30.535953+0200 ciphermld Skipping groups that manage their own networking: &lt;private&gt; default 11:21:30.537007+0200 ciphermld Request to fetchConfigs has started for useCases '["Li ve-Caller-ID-Lookup.TestLiveCallerID.identity"]', userId: '&lt;private&gt;', existingConfigIds: '["id"]' default 11:21:30.542174+0200 ciphermld Request to queries-batch has started for userId: '&lt;private&gt;', length: 28350 default 11:21:30.655914+0200 ciphermld Request to fetchConfigs has finished, response length: 230 default 11:21:30.656182+0200 ciphermld Received configurations: 1 usecase(s), 1 key(s) for group 'Live-Caller-ID-Lookup.TestLiveCallerID.identity' debug 11:21:30.660868+0200 ciphermld Skipping non-active key: timestamp: 1738660849 key_config { encryption_parameters { polynomial_degree: 4096 plaintext_modulus: 65537 coefficient_moduli: [134176769, 268369921, 268361729] security_level: Quantum128 he_scheme: BFV } galois_elements: [2049, 4097] has_relin_key: true } error 11:21:30.662982+0200 ciphermld No key for use-case 'Live-Caller-ID-Lookup.TestLiveCallerID.identity' error 11:21:30.663022+0200 ciphermld requestData(byKeywords:shardIds:clientConfig:) threw an error: CipherML.CipherMLError.missingSecre t Ke y default 11:21:30.663824+0200 com.apple.CallKit.CallDirectory &lt;private&gt; XPC request complete, results(0) error:Error Domain=CipherML.CipherMLError Code=32 "missing secre t ke y" UserInfo={NSLocalizedDescription=missing secre t ke y} default 11:21:30.972372+0200 ciphermld Request to queries-batch has finished response, length: 0 default 11:21:30.974711+0200 com.apple.CallKit.CallDirectory &lt;private&gt; XPC request complete, results(1) error:(null) default 11:21:36.161964+0200 com.apple.CallKit.CallDirectory &lt;private&gt; Sending XPC request default 11:21:36.163149+0200 com.apple.CallKit.CallDirectory &lt;private&gt; Sending XPC request default 11:21:36.169931+0200 ciphermld requestData(byKeywords:shardIds:clientConfig:) method was called default 11:21:36.170448+0200 ciphermld requestData(byKeywords:shardIds:clientConfig:) method was called default 11:21:36.174001+0200 ciphermld Cached: 0 / Missing: 1 error 11:21:36.174997+0200 ciphermld No userId or secre t Ke y for use-case '.Lve-Caller-ID-Lookup.TestLiveCallerID.identity'. Running rotation task' default 11:21:36.175075+0200 ciphermld Running rotation task for ["Live-Caller-ID-Lookup.TestLiveCallerID.identity"] info 11:21:36.175240+0200 ciphermld Skipping groups that manage their own networking: &lt;private&gt; default 11:21:36.177700+0200 ciphermld Request to fetchConfigs has started for useCases '["Live-Caller-ID-Lookup.TestLiveCallerID.identity"]', userId: '&lt;private&gt;', existingConfigIds: '["id"]' default 11:21:36.179914+0200 ciphermld Request to queries-batch has started for userId: '&lt;private&gt;', length: 28350 default 11:21:36.336051+0200 ciphermld Request to fetchConfigs has finished, response length: 230 default 11:21:36.336308+0200 ciphermld Received configurations: 1 usecase(s), 1 key(s) for group 'Live-Caller-ID-Lookup.TestLiveCallerID.identity' debug 11:21:36.341522+0200 ciphermld Skipping non-active key: timestamp: 1738660849 key_config { encryption_parameters { polynomial_degree: 4096 plaintext_modulus: 65537 coefficient_moduli: [134176769, 268369921, 268361729] security_level: Quantum128 he_scheme: BFV } galois_elements: [2049, 4097] has_relin_key: true } error 11:21:36.356497+0200 ciphermld No key for use-case 'Live-Caller-ID-Lookup.TestLiveCallerID.identity' error 11:21:36.356669+0200 ciphermld requestData(byKeywords:shardIds:clientConfig:) threw an error: CipherML.CipherMLError.missingSecre t Ke y default 11:21:36.357075+0200 com.apple.CallKit.CallDirectory &lt;private&gt; XPC request complete, results(0) error:Error Domain=CipherML.CipherMLError Code=32 "missing secre t ke y" UserInfo={NSLocalizedDescription=missing secre t ke y} default 11:21:36.625701+0200 ciphermld Request to queries-batch has finished response, length: 0 default 11:21:36.626749+0200 com.apple.CallKit.CallDirectory
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246
Feb ’25
VoiceOver Headings Accessibility Rotor with SwiftUI on iOS
Hi, On iOS, I'd like to mark views that are inside a LazyVStack as headers for VoiceOver (make them appear in the headings rotor). In a VStack, you just have add .accessibilityAddTraits(.isHeader) to your header view. However, if your view is in a LazyVStack, that won't work if the view is not visible. As its name implies, LazyVStack is lazy so that makes sense. There is very little information online about system rotors, but it seems you are supposed to use .accessibilityRotor() with the headings system rotor (.accessibilityRotor(.headings)) outside of the LazyVStack. Something like the following. .accessibilityRotor(.headings) { ForEach(entries) { entry in // entry.id must be the same as the id of the SwiftUI view it is about AccessibilityRotorEntry(entry.name, id: entry.id) } } It kinds of work, but only kind of. When using .accessibilityAddTraits(.isHeader) in a VStack, the view is in the headings rotor as soon as you change screen. However, when using .accessibilityRotor(.headings), the headers (headings?) are not in the headings rotor at the time the screen appears. You have to move the accessibility focus inside the screen before your headers show up. I'm a beginner in regards to VoiceOver, so I don't know how a blind user used to VoiceOver would perceive this, but it feels to me that having to move the focus before the headers are in the headings rotor would mean some users would miss them. So my question is: is there a way to have headers inside a LazyVStack (and are not necessarily visible at first) to be in the headings rotor as soon as the screen appears? (be it using .accessibilityRotor(.headings) or anything else) The "SwiftUI Accessibility: Beyond the basics" talk from WWDC 2021 mentions custom rotors, not system rotors, but that should be close enough. It mentions that for accessibilityRotor to work properly it has to be applied on an accessibility container, so just in case I tried to move my .accessibilityRotor(.headings) to multiple places, with and without the accessibilityElement(children: .contain) modifier, but that did not seem to change the behavior (and I could not understand why accessibilityRotor could not automatically make the view it is applied on an accessibility container if needed). Also, a related question: when using .accessibilityRotor(.headings) on a screen, is it fine to mix uses of .accessibilityRotor(.headings) and .accessibilityRotor(.headings)? In a screen with multiple type of contents (something like ScrollView { VStack { MyHeader(); LazyVStack { /* some content */ }; LazyVStack { /* something else */ } } }), having to declare all headers in one place would make code reusability harder. Thanks
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104
Jun ’25
Reality Composer Pro Performance on iOS
I need help to wrap my head around this... If I import the Reality Composer Pro package and load it into an ARView, I will see 1.3gb of memory usage and about 180-220% cpu usage. The frames will start at around 60fps, and then eventually drop to around 30fps. If I export the usdz from Reality Composer Pro and load that into the same ARView, I will see about 1gb of memory usage and around 150% cpu usage; fps holds longer at 60 but eventually drops. If I load that same usdz into a QuickLook view, I will see about 55mb of memory usage, 9-11% cpu, and the frames stay locked at 116fps. The only thing I notice is the button I have is slightly less responsive, but it all still works fine. I don't understand. How can I make the ARView work as efficiently as QuickLook?
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270
Mar ’25