My app allows to save user-selected URLs in a list and browse them with a tap. A user reported that the app often shows that when browsing their saved entry for "On My iPad", it's apparently empty (it contains no files). I saved "On My iPad" in my own list some time ago and noticed that the same issue occurs. The URL seems to be correctly resolved from the saved bookmark data, but I noticed that url.startAccessingSecurityScopedResource() returns false. The other URL I saved some time ago is iCloud Drive, which I can access without issues. If I select "On My iPad" again in a file importer, create new bookmark data from it and resolve the URL from it, access works correctly. I create bookmark data like this: let data = try url.bookmarkData(includingResourceValuesForKeys: [.localizedNameKey, .pathKey, .volumeIsLocalKey]) and resolve URLs like this: let url = try URL(resolvingBookmarkData: data, bookmarkDataIsStale: &bookmarkDataIsStale) bookmarkDataIsStale is false for both the working and not working URLs for "On My iPad". The two bookmark data are different though, even if url.path is the same. What could be the issue?

Users of my different apps started reporting an issue that could be related to the ones discussed in this other post: paths on an external volume, such as one mounted by "NTFS for Mac", or a path on a Synology volume, are "converted" to / (Macintosh HD) after going through "laundry" (creating the security-scoped bookmark, resolving the URL from it and using this new URL instead of the one returned by the open panel). Because of this issue, users of my apps are unable to select external volumes, which renders the different apps more or less useless. I've already received many emails regarding this issue in the past few days. A timely fix or suggestion for a workaround would be much appreciated, so that they don't have to wait for months before the next minor macOS release. The intention of this post is also to show users of my apps that this is a real issue. I created FB21002290 and TSI 16931637.

A user of one of my apps reported that since the update to macOS 26.1 they are no longer able to scan Macintosh HD: the app used to work, but now always reports that Macintosh HD contains a single empty file named .nofollow, or rather the path is resolved to /.nofollow. Initially I thought this could be related to resolving the file from the saved bookmark data, but even restarting the app and selecting Macintosh HD in an open panel (without resolving the bookmark data) produces the same result. The user tried another app of mine with the same issue, but said that they were able to scan Macintosh HD in other App Store apps. I never heard of this issue before and my apps have been on the App Store for many years, but it looks like I might be doing something wrong, or the APIs that I use are somehow broken. In all my apps I currently use getattrlistbulk because I need attributes that are not available as URLResourceKey in all supported operating system versions. What could be the issue? I'm on macOS 26.1 myself and never experienced it.

I regularly receive emails from my customers asking why my app, which copies files from a source folder to a destination folder, gives an error during the copy operation, usually when some kind of NAS is involved. I then ask if copying the same file works in the Finder and they usually say yes. Then it’s up to me to contact the NAS vendor and ask why their NAS doesn’t work correctly with the copyfile function which my app uses to copy files, and provide them with a sample Xcode project that reproduces the issue. It would be so much easier for me, and probably other developers as well, if my customers could test their NAS with the Finder, then if it doesn’t work, contact their NAS vendor and solve the issue, or if it works, rest assured that file copies will work for any other app that uses the same API as the Finder. I could spend my time doing much more productive and interesting work rather than checking why every other NAS doesn’t work with my app which, after all, uses the most basic file copy mechanism available on macOS. Is there any chance that in the future (hopefully sooner than later) there will be an API to copy files like the Finder with progress information, or is there a reason why this won't ever be possible? I created FB20929181.

Xcode downloaded a crash report for my app that crashed when trying to insert a String into a Set<String>. Apparently there was an assertion failure ELEMENT_TYPE_OF_SET_VIOLATES_HASHABLE_REQUIREMENTS. I assume that this assertion failure happened because the hash of the new element didn't match the hash of an equal already inserted element, but regardless, I don't understand how inserting a simple string could trigger this assertion. Here is essentially the code that leads to the crash. path is any file system directory, and basePath is a directory higher in the hierarchy, or path itself. var scanErrorPaths = Set<String>() func main() { let path = "/path/to/directory" let basePath = "/path" let fileDescriptor = open(path, O_RDONLY) if fileDescriptor < 0 { if (try? URL(fileURLWithPath: path, isDirectory: false).checkResourceIsReachable()) == true { scanErrorPaths.insert(path.relativePath(from: basePath)!) return } } extension String { func relativePath(from basePath: String) -> String? { if basePath == "" { return self } guard let index = range(of: basePath, options: .anchored)?.upperBound else { return nil } return if index == endIndex || basePath == "/" { String(self[index...]) } else if let index = self[index...].range(of: "/", options: .anchored)?.upperBound { String(self[index...]) } else { nil } } } crash.crash

It’s very frustrating when in a feedback I specify that I cannot reliably reproduce it and the feedback gets closed with the message “Since this issue cannot be reproduced, this report has been closed”, e.g. FB18985938. Is Apple not interested in hearing about issues that cannot be reliably reproduced? Many issues unfortunately depend on a variety of factors and it’s often impossible for third-party developers or users to figure out how to reliably reproduce them. Usually these kind of issues get addressed by e.g. adding more logging so that the next time it happens it's easier to find out what's causing it. Then the last part of the message “Please file a new report with a sysdiagnose if you encounter this issue again” sounds like I’m being teased, because what use is a new sysdiagnose if I still cannot reproduce it reliably? It will just be closed like the last one. I created FB20595673 for this issue.

When comparing the Assets.car file of the previous and current versions of my app, compiled with Xcode 16 and 26, respectively, with the Terminal command assetutil --info MyApp.app/Contents/Resources/Assets.car I see that the new version contains many more app icons at different sizes, increasing my app's size by 1 MB (not much, but considering that the app is only 6 MB in total...): { "AssetType" : "MultiSized Image", "Name" : "AppIcon", "NameIdentifier" : 6849, "Scale" : 1, "SHA1Digest" : "9D75F76992E9E9E5531A214A4AE282EBD381F7EB903024E00FB25EB42381CC45", "SizeOnDisk" : 308, "Sizes" : [ "16x16 index:1 idiom:universal", "32x32 index:2 idiom:universal", "64x64 index:3 idiom:universal", "128x128 index:4 idiom:universal", "256x256 index:5 idiom:universal", "512x512 index:6 idiom:universal", "1024x1024 index:7 idiom:universal" ] } The previous one allowed me to add only two sizes: { "AssetType" : "MultiSized Image", "Name" : "AppIcon", "NameIdentifier" : 6849, "Scale" : 1, "SHA1Digest" : "AC782A2FFF9A4B2D563EF64DF41A179583440560F8732A176A8376B31000368E", "SizeOnDisk" : 248, "Sizes" : [ "256x256 index:1 idiom:universal", "512x512 index:2 idiom:universal" ] } Is there a way to only ship the strictly necessary app icons sizes while using Xcode 26 Icon Composer, or will all the sizes be required going forward?

I have an iOS app with a QuickLook extension. I also added Apple Vision Pro in the target's General > Supported Destinations section. About one year ago, I was able to run the app on iPhone, iPad and Apple Vision Pro Simulators. Today I tried running it again on Apple Vision Pro with Xcode 26.0.1, but Xcode shows this error: Try again later. Appex bundle at ~/Library/Developer/CoreSimulator/Devices/F6B3CCA8-82FA-485F-A306-CF85FF589096/data/Library/Caches/com.apple.mobile.installd.staging/temp.PWLT59/extracted/problem.app/PlugIns/problemQuickLook.appex with id org.example.problem.problemQuickLook specifies a value (com.apple.quicklook.preview) for the NSExtensionPointIdentifier key in the NSExtension dictionary in its Info.plist that does not correspond to a known extension point. I tried again later a couple times, even after running Clean Build Folder Immediately, without any change. I can reproduce this with a fresh Xcode project to which I add a Quick Look Preview Extension and Apple Vision Pro as a supported destination. The error doesn't happen when running on Apple Vision Pro (Designed for iPad) or iPad Pro 13-inch (M4) destinations. What is the problem? I created FB20448815.

macOS 26 sometimes draws the title bar background even when setting NSWindow.titlebarAppearsTransparent = true and I don't understand the logic behind it, or how I can turn this off. I'm trying to do something similar to Xcode's "Welcome to Xcode" window which has a left view and a right table view. In my simplified example, the window contains a label and a text view. This used to work in macOS 15, but in macOS 26 the text view is partially covered by the title bar: As soon as I remove the line scrollView.hasVerticalScroller = true, the title bar isn't drawn anymore: The title bar also isn't drawn when removing the view on the left of the text view: I created FB20341654. This may be related to this other issue: NSWindow.titlebarAppearsTransparent only works after collapsing and expanding sidebar @main class AppDelegate: NSObject, NSApplicationDelegate { func applicationDidFinishLaunching(_ aNotification: Notification) { let window = NSWindow(contentViewController: ViewController()) window.titlebarAppearsTransparent = true window.titleVisibility = .hidden window.styleMask = [.titled, .closable, .fullSizeContentView] window.makeKeyAndOrderFront(nil) } } class ViewController: NSViewController { override func loadView() { view = NSView(frame: CGRect(x: 0, y: 0, width: 400, height: 200)) let scrollView = NSScrollView() scrollView.hasVerticalScroller = true // commenting this line out solves the issue scrollView.translatesAutoresizingMaskIntoConstraints = false scrollView.automaticallyAdjustsContentInsets = false let documentView = NSTextView() documentView.string = (0..<10).map({ "\($0)" }).joined(separator: "\n") scrollView.documentView = documentView let stack = NSStackView(views: [ NSTextField(labelWithString: "asdfasdfasdfasdf"), // commenting this line out also solves the issue scrollView ]) stack.orientation = .horizontal view.addSubview(stack) NSLayoutConstraint.activate([stack.topAnchor.constraint(equalTo: view.topAnchor), stack.leadingAnchor.constraint(equalTo: view.leadingAnchor), stack.trailingAnchor.constraint(equalTo: view.trailingAnchor), stack.bottomAnchor.constraint(equalTo: view.bottomAnchor)]) } }

In macOS 26 I noticed there is a section Menu Bar in System Settings which allows to toggle visibility of status items created with NSStatusItem. I'm assuming this is new, since I never noticed it before. Currently my app has a menu item that allows toggling its status item, but now I wonder whether it should always create the status item and let the user control its visibility from System Settings. Theoretically, keeping this option inside the app could lead to confusion if the user has previously disabled the status item in System Settings, then perhaps forgot about it, and then tries to enable it inside the app, but apparently nothing happens because System Settings overrides the app setting. Should I remove the option inside the app? This also makes me think of login items, which can be managed both in System Settings and inside the app via SMAppService. Some users ask why my app doesn't have a launch at login option, and I tell them that System Settings already offers that functionality. Since there is SMAppService I could offer an option inside the app that is kept in sync with System Settings, but I prefer to avoid duplicating functionality, particularly if it's something that is changed once by the user and then rarely (if ever) changed afterwards. But I wonder: why can login items be controlled by an app, and the status item cannot (at least I'm not aware of an API that allows to change the option in System Settings)? If the status item can be overridden in System Settings, why do login items behave differently?

I'm using the simplified code below to create a window with 4 split view items, some of them collapsed. I would expect the title bar to be transparent since I'm using window.titlebarAppearsTransparent = true, but it seems that this particular view configuration causes the title bar to be visible until I collapse and expand the sidebar again. Removing any of the split view items, uncollapsing any of them, or changing the view of any of the view controllers, causes the title bar to be consistently visible or hidden, although I don't understand the logic, since I'm telling the window that it should be transparent. When launching the app in light mode, it's more difficult to notice the issue since the title bar background is equal to the content background and only the separator is visible (even though the code sets window.titlebarSeparatorStyle = .none): After collapsing and expanding the sidebar, the separator is gone: In dark mode the title bar is more visible: After collapsing and expanding the sidebar, the title bar background and separator are gone: I created FB20306872. @main class AppDelegate: NSObject, NSApplicationDelegate, NSToolbarDelegate { var splitViewController: NSSplitViewController! func applicationDidFinishLaunching(_ aNotification: Notification) { let splitViewItem1 = NSSplitViewItem(sidebarWithViewController: ViewController1()) let splitViewItem2 = NSSplitViewItem(viewController: ViewController2()) let splitViewItem3 = NSSplitViewItem(viewController: NSViewController()) splitViewItem3.isCollapsed = true let splitViewItem4 = NSSplitViewItem(viewController: NSViewController()) splitViewItem4.isCollapsed = true splitViewController = NSSplitViewController() splitViewController.splitViewItems = [splitViewItem1, splitViewItem2, splitViewItem3, splitViewItem4] let window = NSWindow(contentViewController: splitViewController) window.styleMask = [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView] window.titlebarAppearsTransparent = true let toolbar = NSToolbar(identifier: "") toolbar.delegate = self toolbar.displayMode = .iconOnly window.toolbar = toolbar window.titlebarSeparatorStyle = .none window.makeKeyAndOrderFront(nil) } func toolbarAllowedItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] { return [.space, .flexibleSpace, .sidebarTrackingSeparator, .init("item")] } func toolbarDefaultItemIdentifiers(_ toolbar: NSToolbar) -> [NSToolbarItem.Identifier] { return [.init("item"), .sidebarTrackingSeparator] } func toolbar(_ toolbar: NSToolbar, itemForItemIdentifier itemIdentifier: NSToolbarItem.Identifier, willBeInsertedIntoToolbar flag: Bool) -> NSToolbarItem? { switch itemIdentifier.rawValue { case "item": let item = NSToolbarItem(itemIdentifier: itemIdentifier) item.image = NSImage(systemSymbolName: "sidebar.leading", accessibilityDescription: nil) item.action = #selector(toggleSidebar(_:)) item.target = self return item default: return nil } } @objc func toggleSidebar(_ sender: Any?) { splitViewController.splitViewItems[0].animator().isCollapsed = !splitViewController.splitViewItems[0].isCollapsed } } class ViewController1: NSViewController { override func loadView() { view = NSView(frame: CGRect(x: 0, y: 0, width: 300, height: 200)) } } class ViewController2: NSViewController { override func loadView() { let textView = NSTextView() let scrollView = NSScrollView(frame: CGRect(x: 0, y: 0, width: 400, height: 200)) scrollView.hasVerticalScroller = true scrollView.documentView = textView view = scrollView } }

I noticed that when I have a fullscreen window in macOS 26, sidebars look like they are cut off at the top: they suddenly stop where the title bar/toolbar would appear when moving the mouse to the top of the screen, leaving a wide empty gap. Am I the only one who finds this ugly? Is this intended, or is there a workaround? This is how it looks in fullscreen (the sidebar borders are not easy to distinguish, look for the drop shadow): And this when moving the mouse to the top screen border to show the menu bar: I created FB20291636. @main class AppDelegate: NSObject, NSApplicationDelegate, NSWindowDelegate { func applicationDidFinishLaunching(_ aNotification: Notification) { let splitViewController = NSSplitViewController() splitViewController.addSplitViewItem(NSSplitViewItem(sidebarWithViewController: ViewController())) splitViewController.addSplitViewItem(NSSplitViewItem(viewController: ViewController())) let window = NSWindow(contentViewController: splitViewController) window.styleMask = [.titled, .closable, .miniaturizable, .resizable, .fullSizeContentView] window.toolbar = NSToolbar() window.delegate = self window.makeKeyAndOrderFront(nil) } func window(_ window: NSWindow, willUseFullScreenPresentationOptions proposedOptions: NSApplication.PresentationOptions = []) -> NSApplication.PresentationOptions { return [.autoHideToolbar, .autoHideMenuBar, .fullScreen] } } class ViewController: NSViewController { override func loadView() { let stack = NSStackView(views: [ NSTextField(labelWithString: "asdf") ]) stack.orientation = .vertical stack.alignment = .leading view = stack view.frame = CGRect(x: 0, y: 0, width: 300, height: 300) } }

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 } }

While preparing automated screenshots with Xcode UI tests for the iOS 26 release, I noticed that this simple line of code app.buttons["myTabItem"].tap() doesn't always work, both on iPhone and iPad Simulator. In fact, it rarely works. Even when repeating the same test, mostly it fails on that line, but a few times it works and I can see the tab item change in the simulator. My main view looks like this: TabView { MyTab1() .tag(tag1) .tabItem { Label("label1", systemImage: "image1") } MyTab2() .tag(tag2) .tabItem { Label("label2", systemImage: "image2") .accessibilityIdentifier("myTabItem") } The error I get is Failed to tap "myTabItem" Button: No matches found for Elements matching predicate '"myTabItem" IN identifiers' from input In the given list of buttons, I see the tab items with their labels, but none of them seem to have an identifier, while other buttons have the correct identifier. I wonder how this can only sometimes work. I tried isolating the issue by iteratively commenting out parts of the SwiftUI code, but unfortunately the behaviour seems erratic. When a change results in the issue not happening anymore, undoing the last X changes often causes the issue to stay away, even with configurations that previously had the issue. I've already spent almost a whole day trying to find the root cause, but with such apparently random behaviour it has proven impossible. Of course, I cannot reproduce the issue with a fresh test project, so the only way to reproduce it with 95% probability is running my original project. Has anyone had the same issue, or does anyone know how I could debug this to find out what causes my UI test to not be able to tap another tab item?

In the past I was always able to install every major macOS version on an external drive so that I can test my apps. But now I'm unable to install macOS Tahoe 26 on an external drive. Actually, as far as I'm aware, there are not even official links to macOS 26 installers, but only instructions on how to update to macOS 26 from an existing macOS installation. So I thought I'd install macOS 15 on a separate drive and then update to macOS 26, but whenever I run the macOS 15 installer, tell it to install on the external drive, and reboot after the setup process completes, my MacBook just boots into my main macOS partition as if nothing happened. 3 months ago I somehow managed to install macOS Tahoe beta 1 on an external drive, I don't remember how (but I don't think it was anything crazy); booting into that beta 1 partition and trying to update doesn't work either, as my MacBook again boots into my main macOS partition. I already asked help about the update problem one month ago here, but nobody replied. Could someone at Apple please provide instructions on how one is supposed to install macOS 26 on an external drive (if possible before it becomes available to the public)? Are we supposed to buy a separate Mac for every macOS version that we want to test our apps on?