Overview

After upgrading to macOS 26, I noticed that showing a Quicklook preview in my app is very slow. Showing small text files is fine, but some other files I've tried, such as a Numbers document, take about 30 seconds (during which the indeterminate loading indicator appears) before the preview is shown. When showing the preview of an app, such as Xcode, the panel opens immediately with a placeholder image for the Xcode icon, and the actual Xcode icon is shown only after about 25 seconds. During this time many logs appear: FPItemsFromURLsWithTimeout timed out (5.000000s) for: file:///.file/id=6571367.2/ (/) FPItemsFromURLsWithTimeout timed out (5.000000s) for: file:///.file/id=6571367.23684/ (/Users) FPItemsFromURLsWithTimeout timed out (5.000000s) for: file:///.file/id=6571367.248032/ (/Users/n{9}k) FPItemsFromURLsWithTimeout timed out (5.000000s) for: file:///.file/id=6571367.248084/ (/Users/n{9}k/Downloads) Failed to add registration dmf.policy.monitor.app with error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.dmd.policy was invalidated: failed at lookup with error 159 - Sandbox restriction." UserInfo={NSDebugDescription=The connection to service named com.apple.dmd.policy was invalidated: failed at lookup with error 159 - Sandbox restriction.} Failed to register application policy monitor with identifier 69DDBDB4-0736-42FA-BA7A-C8D7EA049E29 for types {( applicationcategories, websites, categories, applications )} with error: Error Domain=NSCocoaErrorDomain Code=4099 "The connection to service named com.apple.dmd.policy was invalidated: failed at lookup with error 159 - Sandbox restriction." UserInfo={NSDebugDescription=The connection to service named com.apple.dmd.policy was invalidated: failed at lookup with error 159 - Sandbox restriction.} FPItemsFromURLsWithTimeout timed out (5.000000s) for: file:///.file/id=6571367.155797561/ (~/Downloads/X{3}e.app) It seems that Quicklook tries to access each parent directory of the previewed file, and each one fails after 5 seconds. Why is Quicklook all of a sudden so slow? It used to be almost instant in macOS 15. I created FB20268201. import Cocoa import Quartz @main class AppDelegate: NSObject, NSApplicationDelegate, QLPreviewPanelDataSource, QLPreviewPanelDelegate { var url: URL? func applicationDidFinishLaunching(_ notification: Notification) { let openPanel = NSOpenPanel() openPanel.runModal() url = openPanel.urls[0] QLPreviewPanel.shared()!.makeKeyAndOrderFront(nil) } override func acceptsPreviewPanelControl(_ panel: QLPreviewPanel!) -> Bool { return true } override func beginPreviewPanelControl(_ panel: QLPreviewPanel!) { panel.dataSource = self panel.delegate = self } override func endPreviewPanelControl(_ panel: QLPreviewPanel!) { panel.dataSource = nil panel.delegate = nil } func numberOfPreviewItems(in panel: QLPreviewPanel!) -> Int { return 1 } func previewPanel(_ panel: QLPreviewPanel!, previewItemAt index: Int) -> QLPreviewItem! { return url as? QLPreviewItem } }

We are encountering the following issue with our VoIP application for iPhone, published on the App Store, and would appreciate your guidance on possible countermeasures. The VoIP application (callee side) utilizes a Wi-Fi network. The sequence leading to the issue is as follows: VoIP App (callee): Launches iPhone (callee): Locks (e.g., by short-pressing the power button) VoIP App (callee): Transitions to a suspended state VoIP App (caller): Initiates a VoIP call VoIP App (callee): Receives a local push notification VoIP App (callee): Answers the incoming call VoIP App (callee): Executes performAnswerCallAction() After this, the VoIP App (callee) uses "NSTimer scheduledTimerWithTimeInterval" to manage internal processing timing. However, the processing sometimes takes longer than the specified waiting time. Specifically, delays of several seconds can occur. We understood that if the user is interacting with the screen and both the iPhone and the VoIP app are in an active state, the VoIP app's processing would not be delayed. However, can significant delays (several seconds) in application processing still occur even when the iPhone is in an active state (i.e., the user is interacting with the screen)?"

I have a binary executable which needs to be given Accessibility Permissions so it can inject keypresses and mouse moves. This was always possible up to macOS 15 - when the first keypress arrived the Accessibility Permissions window would open and allow me to add the executable. However this no longer works in macOS 26: the window still opens, I navigate to the executable file and select it but it doesn't appear in the list. No error message appears. I'm guessing that this may be due to some tightening of security in Tahoe but I need to figure out what to change with my executable to allow it to work.

We set the CVDisplayLink on macOS to 0 or 120, and get the following. This then clamps maximum refresh to 60Hz on the 120Hz ProMotion display on a MBP M2 Max laptop. How is this not fixed in 4 macOS releases? CoreVideo: currentVBLDelta returned 200000 for display 1 -- ignoring unreasonable value CoreVideo: [0x7fe2fb816020] Bad CurrentVBLDelta for display 1 is zero. defaulting to 60Hz.

We have a password entry field with a "show password" button. The button effectively turns the "secure text entry" textfield into a non-secure text entry field allowing the user to view what they typed in. When VoiceOver is enabled, I am not including that button in the UI; it doesn't seem to make sense to me for the following reasons. If you properly test with the screen curtain, the functionality is useless. You don't see anything. I've tried to explain this to my accessibility team. It's also quite ridiculous to offer to show a blind user their password, I'm sure they'd love to see it, but they just can't. This would almost seem insulting as well. If by toggling that button, and turning a secure text entry into a non-secure text entry, now the app is literally speaking their password aloud. This seems like a security vulnerability to me. What if someone else overhears the password spoken aloud. The accessibility team is insisting that I need to include the "show password" button when VoiceOver is enabled. This is the response I received. "functionality should be the same for VI users as for sighted users. It may happen that a VI user wants to check what is typed into password field in order to correct mistakes". Again, I don't agree with that because functionality should not be the same. Functionality should be changed and altered as necessary to make the user experience as accessible as possible. And in this scenario, to me the functionality doesn't make sense at all in a VoiceOver setting. Any thoughts on this? Am I incorrect here? Are there benefits of including a "show password" button to a user utilizing VoiceOver? What should then the functionality be? Speak the password aloud? Thanks.

Hi, I’m using Network Framework to implement a UDP client via NWConnection, and I’m looking for clarification about the correct and fully safe shutdown procedure, especially regarding resource release. I have initiated some pending receive calls on the NWConnection (using receive). After calling connection.cancel(), do we need to wait for the cancellation of these pending receives? As mentioned in this thread, NWConnection retains references to the receive closures and releases them once they are called. If a receive closure holds a reference to the NWConnection itself, do we need to wait for these closures to be called to avoid memory leaks? Or, if there are no such retained references, we don't need to wait for the cancellation of the pending I/O and cancelled state for NWConnection?

Summary NetworkConnection<WebSocket> in iOS 26 Network framework throws POSIXErrorCode(rawValue: 22): Invalid argument when receiving WebSocket ping (opcode 9) or pong (opcode 10) control frames. This prevents proper WebSocket keep-alive functionality. Environment iOS 26.0 (Simulator) macOS 26.1 Xcode 26.0 Note: This issue was initially discovered on iOS 26 Simulator. The same behavior was confirmed on macOS 26, suggesting a shared bug in the Network framework. The attached sample code is for macOS for easier reproduction. Description When using the new NetworkConnection<WebSocket> API introduced in iOS 26 or macOS 26, the receive() method throws EINVAL error whenever a ping or pong control frame is received from the server. This is a critical issue because: WebSocket servers commonly send ping frames to keep connections alive Clients send ping frames to verify connection health The receive callback never receives the ping/pong frame - the error occurs before the frame reaches user code Steps to Reproduce Create a WebSocket connection to any server that supports ping/pong (e.g., wss://echo.websocket.org): import Foundation import Network // MARK: - WebSocket Ping/Pong EINVAL Bug Reproduction // This sample demonstrates that NetworkConnection<WebSocket> throws EINVAL // when receiving ping or pong control frames. @main struct WebSocketPingPongBug { static func main() async { print("=== WebSocket Ping/Pong EINVAL Bug Reproduction ===\n") do { try await testPingPong() } catch { print("Test failed with error: \(error)") } } static func testPingPong() async throws { let host = "echo.websocket.org" let port: UInt16 = 443 print("Connecting to wss://\(host)...") let endpoint = NWEndpoint.hostPort( host: NWEndpoint.Host(host), port: NWEndpoint.Port(rawValue: port)! ) try await withNetworkConnection(to: endpoint, using: { WebSocket { TLS { TCP() } } }) { connection in print("Connected!\n") // Start receive loop in background let receiveTask = Task { var messageCount = 0 while !Task.isCancelled { do { let (data, metadata) = try await connection.receive() messageCount += 1 print("[\(messageCount)] Received frame - opcode: \(metadata.opcode)") if let text = String(data: data, encoding: .utf8) { print("[\(messageCount)] Content: \(text)") } else { print("[\(messageCount)] Binary data: \(data.count) bytes") } } catch let error as NWError { if case .posix(let code) = error, code == .EINVAL { print("❌ EINVAL error occurred! (POSIXErrorCode 22: Invalid argument)") print(" This is the bug - ping/pong frame caused EINVAL") // Continue to demonstrate workaround continue } print("Receive error: \(error)") break } catch { print("Receive error: \(error)") break } } } // Wait for initial message from server try await Task.sleep(for: .seconds(2)) // Test 1: Send text message (should work) print("\n--- Test 1: Sending text message ---") try await connection.send("Hello, WebSocket!") print("✅ Text message sent") try await Task.sleep(for: .seconds(1)) // Test 2: Send ping (pong response will cause EINVAL) print("\n--- Test 2: Sending ping frame ---") print("Expecting EINVAL when pong is received...") let pingMetadata = NWProtocolWebSocket.Metadata(opcode: .ping) try await connection.ping(Data()) { pingMetadata } print("✅ Ping sent, waiting for pong...") // Wait for pong response try await Task.sleep(for: .seconds(2)) // Cleanup receiveTask.cancel() print("\n=== Test Complete ===") print("If you saw 'EINVAL error occurred!' above, the bug is reproduced.") } } } The receive() call fails with error when pong arrives: ❌ EINVAL error occurred! (POSIXErrorCode 22: Invalid argument) Test Results Scenario Result Send/receive text (opcode 1) ✅ OK Client sends ping, receives pong ❌ EINVAL on pong receive Expected Behavior The receive() method should successfully return ping and pong frames, or at minimum, handle them internally without throwing an error. The autoReplyPing option should allow automatic pong responses without disrupting the receive loop. Actual Behavior When a ping or pong control frame is received: The receive() method throws NWError.posix(.EINVAL) The frame never reaches user code (no opcode check is possible) The connection remains valid, but the receive loop is interrupted Workaround Catch the EINVAL error and restart the receive loop: while !Task.isCancelled { do { let received = try await connection.receive() // Process message } catch let error as NWError { if case .posix(let code) = error, code == .EINVAL { // Control frame caused EINVAL, continue receiving continue } throw error } } This workaround allows continued operation but: Cannot distinguish between ping-related EINVAL and other EINVAL errors Cannot access the ping/pong frame content Cannot implement custom ping/pong handling Impact WebSocket connections to servers that send periodic pings will experience repeated EINVAL errors Applications must implement workarounds that may mask other legitimate errors Additional Information Packet capture confirms ping/pong frames are correctly transmitted at the network level The error occurs in the Network framework's internal processing, before reaching user code

What is the correct way to implement scrolling in a looong list that uses ScrollView and LazyVstack Imagine I have some api that returns a longs list of comments with replies The basic usecase is to scroll to the bottom(to the last comment) Most of the time this works fine But, imagine some of the comments have many replies like 35 or more (or even 300) User expands replies for the first post, then presses scroll to bottom. The scrollbar reaches the bottom and I see the blank screen. Sometimes the scrollbar may jump for a while before lazyvstack finishes loading or until I manually scroll up a bit or all the way up and down What should I do in this case? Is this the swiftui performance problem that has no cure? Abstract example: ScrollViewReader { proxy in ScrollView { LazyVStack { ForEach(comments) { comment in CommentView(comment: comment) .id("comment-\(comment.id)") } } } } struct CommentView: View { let comment: Comment @State var isExpanded = false var body: some View { VStack { Text(comment.text) if isExpanded { RepliesView(replies: comment.replies) // 35-300+ replies } } } } ... scroll proxy.scrollTo("comment-\(lastComment.id)", anchor: .bottom)

What is the reason the hand-tracking joints have these axes? I'm trying to create a virtual hands model and that's a mess.

Hi everyone, I'm currently working on a Swift Playgrounds project where I need to incorporate a Metal shader file. However, when I tried to include my shader file (PincushionShader.metal), I encountered the following error: Is it possible to use Metal shader files within Swift Playgrounds, it is really important for my swift student challenge scene? If not, are there any workarounds or recommended approaches for testing Metal shaders in a similar environment? Any guidance or suggestions would be greatly appreciated!

Hi all, when I launch my macOS app from Xcode 16 on ARM64, appKit logs me this error on the debug console: It's not legal to call -layoutSubtreeIfNeeded on a view which is already being laid out. If you are implementing the view's -layout method, you can call -[super layout] instead. Break on _NSDetectedLayoutRecursion(void) to debug. This will be logged only once. This may break in the future. _NSDetectedLayoutRecursion doesn't help a lot, giving me these assembly codes from a call to a subclassed window method that looks like this: -(void) setFrame:(NSRect)frameRect display:(BOOL)flag { if (!_frameLocked) [super setFrame:frameRect display:flag]; } I have no direct call to -layoutSubtreeIfNeeded from a -layout implementation in my codes. I have a few calls to this method from update methods, however even if I comment all of them, the error is still logged... Finally, apart from that log, I cannot observe any layout error when running the program. So I wonder if this error can be safely ignored? Thanks!

I exported some usd assets from IsaacSim but they are not showing up correctly on my Apple Vision Pro. Even though the mesh looks to be the correct color in Finder and I can see the Diffuse Color looks correct, the object is still just gray. It should be green!

Hi, This is my first time notarizing an app with Developer ID. I have submitted multiple notarization requests, and all of them have been stuck in "In Progress" status. The oldest one was submitted over 24 hours ago. Is this normal for first-time submissions? How long should I wait before contacting support? Thanks!

I am using Automatically Manage Signing And I have registered my Mac UUID in developer account, but it is still giving me these errors - Device My Mac is not registered to your team Ai Glider Inc. Devices must be registered in order to run your code, but you do not have permission to register them. Please check with your team's admin. No profiles for 'com.aiexample.sebexample' were found Xcode couldn't find any Mac App Development provisioning profiles matching 'com.aiexample.sebexample'.

using Version 26.2 (17C52) I often get "Trace file had no SwiftUI data" why so?

I am requesting assistance with an issue involving my Advanced App Clip Experience, which has remained in the “Received” state for more than few months, preventing the App Clip from becoming available when invoked via QR code. App Details App Name: Yellow Label Verification App Store Bundle ID: com.acviss.demoindia App Clip Bundle ID: com.acviss.demoindia.Clip Team ID: F2RLQ4VV59 App Version (Live): 1.4 Domain: acviss.com Issue Summary My Advanced App Clip Experience is stuck in the “Received” status. The “Publish” and “Build Assignment” options never appear, even though: The updated AASA file is correctly published at: https://acviss.com/.well-known/apple-app-site-association It contains the correct appclips → appID and paths entries It is served with the correct application/json content type Domain validation in App Store Connect shows Validated The App Clip build is already approved and live on the App Store Safari-based App Clip invocation works as expected Despite this, the Advanced App Clip Experience has not transitioned from “Received” to “Processing” or “Published.” Because of this, QR-based invocation consistently shows “App Clip Unavailable”, indicating that the App Clip Experience has not yet been activated on Apple’s backend. Reproduction Steps Publish correct AASA file with appclips array and paths Validate domain (shows green “Validated” in App Store Connect) Open the Advanced App Clip Experience in App Store Connect Status stays as Received “Build Assignment” or “Publish” buttons never appear QR scanning of the App Clip URL continues to show App Clip Unavailable Request Could you please check the backend processing of my App Clip Experience and manually trigger the sync or processing It appears that the App Clip Experience is not being processed even though all configuration, AASA, and domain validations are correct. I would greatly appreciate your assistance in resolving this so the App Clip can be invoked successfully via QR. Thank you very much for your help and support.

In the verifyReceipt API response, there is a "is_trial_period" field. As detailed in WWDC 2023 the verifyReceipt is deprecated, how to fetch the fact that the subscription is during the free trial period via recommended App Store server APIs?

Problem Description: In a SwiftUI application, I've wrapped UIKit's UIPageViewController using UIViewControllerRepresentable, naming the wrapped class PagedInfiniteScrollView. This component causes navigation bar elements (title and buttons) to disappear. This issue only occurs in Low Power Mode on a physical device. Steps to Reproduce: Enable Low Power Mode on a physical device and open the app's home page. From the home page, open a detail sheet containing PagedInfiniteScrollView. This detail page include a navigation title and a toolbar button in the top-right corner. PagedInfiniteScrollView supports horizontal swiping to switch pages. Tap the toolbar button in the top-right corner of the detail page to open an edit sheet. Without making any changes, close the edit sheet and return to the detail page. On the detail page, swipe left and right on the PagedInfiniteScrollView. Expected Result: When swiping the PagedInfiniteScrollView, the navigation title and top-right toolbar button of the detail page should remain visible. Actual Result: When swiping the PagedInfiniteScrollView, the navigation title and top-right toolbar button of the detail page disappear. import SwiftUI @main struct CalendarApp: App { var body: some Scene { WindowGroup { ContentView() } } } import SwiftUI struct ContentView: View { @State private var showDetailSheet = false @State private var currentPage: Int = 0 var body: some View { NavigationStack { Button { showDetailSheet = true } label: { Text("show Calendar sheet") } .sheet(isPresented: $showDetailSheet) { DetailSheet(currentPage: $currentPage) } } } } struct DetailSheet: View { @Binding var currentPage: Int @State private var showEditSheet = false var body: some View { NavigationStack { PagedInfiniteScrollView(content: { pageIndex in Text("\(pageIndex)") .frame(width: 200, height: 200) .background(Color.blue) }, currentPage: $currentPage) .sheet(isPresented: $showEditSheet, content: { Text("edit") }) .navigationTitle("Detail") .navigationBarTitleDisplayMode(.inline) .toolbar { ToolbarItemGroup(placement: .topBarTrailing) { Button { showEditSheet = true } label: { Text("Edit") } } } } } } import SwiftUI import UIKit struct PagedInfiniteScrollView<Content: View>: UIViewControllerRepresentable { typealias UIViewControllerType = UIPageViewController let content: (Int) -> Content @Binding var currentPage: Int func makeCoordinator() -> Coordinator { Coordinator(self) } func makeUIViewController(context: Context) -> UIPageViewController { let pageViewController = UIPageViewController(transitionStyle: .scroll, navigationOrientation: .horizontal) pageViewController.dataSource = context.coordinator pageViewController.delegate = context.coordinator let initialViewController = UIHostingController(rootView: IdentifiableContent(index: currentPage, content: { content(currentPage) })) pageViewController.setViewControllers([initialViewController], direction: .forward, animated: false, completion: nil) return pageViewController } func updateUIViewController(_ uiViewController: UIPageViewController, context: Context) { let currentViewController = uiViewController.viewControllers?.first as? UIHostingController<IdentifiableContent<Content>> let currentIndex = currentViewController?.rootView.index ?? 0 if currentPage != currentIndex { let direction: UIPageViewController.NavigationDirection = currentPage > currentIndex ? .forward : .reverse let newViewController = UIHostingController(rootView: IdentifiableContent(index: currentPage, content: { content(currentPage) })) uiViewController.setViewControllers([newViewController], direction: direction, animated: true, completion: nil) } } class Coordinator: NSObject, UIPageViewControllerDataSource, UIPageViewControllerDelegate { var parent: PagedInfiniteScrollView init(_ parent: PagedInfiniteScrollView) { self.parent = parent } func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? { guard let currentView = viewController as? UIHostingController<IdentifiableContent<Content>>, let currentIndex = currentView.rootView.index as Int? else { return nil } let previousIndex = currentIndex - 1 return UIHostingController(rootView: IdentifiableContent(index: previousIndex, content: { parent.content(previousIndex) })) } func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? { guard let currentView = viewController as? UIHostingController<IdentifiableContent<Content>>, let currentIndex = currentView.rootView.index as Int? else { return nil } let nextIndex = currentIndex + 1 return UIHostingController(rootView: IdentifiableContent(index: nextIndex, content: { parent.content(nextIndex) })) } func pageViewController(_ pageViewController: UIPageViewController, didFinishAnimating finished: Bool, previousViewControllers: [UIViewController], transitionCompleted completed: Bool) { if completed, let currentView = pageViewController.viewControllers?.first as? UIHostingController<IdentifiableContent<Content>>, let currentIndex = currentView.rootView.index as Int? { parent.currentPage = currentIndex } } } } extension PagedInfiniteScrollView { struct IdentifiableContent<Content: View>: View { let index: Int let content: Content init(index: Int, @ViewBuilder content: () -> Content) { self.index = index self.content = content() } var body: some View { content } } }

With the RC version of macOS 26, an issue persists when you try to create a bookmark with security scope for the root folder "/". This leads to an error "The file couldn’t be opened.". However, you can create bookmark for /Applications, /System, /Users... This is quite annoying for one of my app because a user can create a cartography of his disk usage, and the access to the root folder "/" is the only way to do so! Is there a workaround? PS: reported the issue with ID FB20186406 let openPanel = NSOpenPanel() openPanel.canChooseDirectories = true openPanel.canChooseFiles = false openPanel.beginSheetModal(for: self.view.window!) { (result) in guard result == .OK, let folderURL = openPanel.url else { return } openPanel.close() do { let data = try folderURL.bookmarkData(options: .withSecurityScope, includingResourceValuesForKeys: nil, relativeTo: nil) print("Bookmark data was created for \(folderURL.path)") } catch (let error) { print("Error creating bookmark for \(folderURL.path), with error: \(error.localizedDescription)") } }

One screen in my app uses a navigation bar with some buttons added to the titleView and some buttons added as a customView of a single rightBarButtonItem. In iOS 26 (beta 9), if I switch to the home screen and back again, the titleView and rightBarButtonItem disappear and an overflow button (three dots) appears instead. Nothing happens when I click the overflow button. Here's a screen capture: https://youtu.be/tthRnMz98kA This also happens when I switch to another app, when I rotate the device or when I resize the app window. In all cases, there is enough room to show all the buttons, but they still disappear. I overrode the viewWillTransition function in my view controller and logged when that runs. I can see that if I switch to the home screen and back again before that runs (within one or two seconds), there's no problem. But once that runs, the navigation bar items disappear and the overflow button appears. I have not done anything to set up the overflow button and don't have any need to use it. The documentation about it isn't very detailed, but it seems like it shouldn't be used unless I add it. This wasn't a problem in iOS 18 or earlier iOS versions. Does anyone know how to stop this? BTW, I'm using Swift, but not SwiftUI.