So if I have a selection in NSBrowser. I hit Option+Command+A to invoke "Deselect" the selection in the parent for the last column drops its selections, as expected. But the column doesn't drop off the browser. The delegate method (void)browser:(NSBrowser *)browser didChangeLastColumn:(NSInteger)oldLastColumn toColumn:(NSInteger)column NS_SWIFT_UI_ACTOR; Never fires (since the column isn't dropped off). But we have. dangling last column with no selection in the previous column. Now if there's enough room for me to deselect by clicking the background, the last column drops off, as expected. This seems to be fairly new? Anyone else experiencing this? These 26point updates seem to keep punching me in the face. And yes. deselect all seems somewhat broken in Column view in the Finder as well, but in a seemingly different way. In Finder it just seems to change the selection color like it deactivated the window but doesn't drop the selection. For me, the selection IS dropped but the column remains visible. Maybe they are using Cocoa bindings or something that resyncs the selection after the mess up. I dk.

I use QLThumbnailGenerator to generate icons. After updating to macOS Tahoe 26.4 the folder color preference of the user is no longer respected. It just makes the icon default 'light blue.'

So I just installed the 26.4 update and unfortunately I have to debug this newly introduced issue (that may work its way into a separate thread). In my debugging steps I'm testing something related to files and I used -activateFileViewerSelectingURLs: to show the file in Finder. Now I am off the main thread. I added this line for testing purposes and I get a crash: NSWindow should only be instantiated on the main thread!' terminating due to uncaught exception of type NSException. So apparently - NSWorkspace is calling through to NSServices APIs and for some reason the system wants to present an NSError, which is a subtopic and other bug on its own because the 'Show in Finder" functionality actually WORKS but it crashed my app! #22in +[NSAlert alertWithError:] () #23in -[NSApplication(NSErrorPresentation) presentError:] () #24 +[NSServicesMenuHandler _performServiceFromEntry:withPasteboard:withRequestor:withInvocationSourceType:withCarbonFocus:withSendTypes:withReturnTypes:canReleasePasteboardImmediately:] () #25 +[NSServicesMenuHandler _performServiceWithoutAlternatesFromEntry:withPasteboard:withRequestor:withInvocationSourceType:] () #26 +[NSServicesMenuHandler _performServiceFromEntry:withPasteboard:withRequestor:withInvocationSourceType:] () #27 [NSWorkspace activateFileViewerSelectingURLs:] What error it is trying to present.. I have no idea. I'm not sure if I actually have a code path that calls this method off the main thread but I guess I'll have to check. This clearly goes against the documentation. NSWorkspace documentation clearly states: -activateFileViewerSelectingURLs: Discussion You can safely call this method from any thread of your app. Is this new in 26.4? I'm not sure but I just noticed. I definitely use other NSWorkspace methods off the main thread in areas of my app. Like -activateFileViewerSelectingURLs: the documentation for those other methods claims you can safely call them off the main thread. So now I'm concerned.

Sort of a continuation of - https://developer.apple.com/forums/thread/813641 I've made a great effort to get NSURL -getResourceValue:forKey: calls etc off the main thread. Great progress. So now I'm working with a file on a really slow network volume I discovered a little hang and luckily enough I'm attached to the debugger so I paused that thing. I see where I'm at. It is: NSPathControl's setURL:. It goes a little something like this: in realpath$DARWIN_EXTSN () +fileSystemRealPath () +[FSNode(SandboxChecks) canAccessURL:withAuditToken:operation:] () +FSNode(SandboxChecks) canReadFromSandboxWithAuditToken:] () LaunchServices::URLPropertyProvider::prepareLocalizedNameValue () LaunchServices::URLPropertyProvider::prepareValues () prepareValuesForBitmap () FSURLCopyResourcePropertiesForKeysInternal () CFURLCopyResourcePropertiesForKeys () -[NSURL resourceValuesForKeys:error:] () in function signature specialization <Arg[1] = Dead> of Foundation._NSFileManagerBridge.displayName(atPath: Swift.String) -> Swift.String () in displayName () -[NSPathCell _autoUpdateCellContents] () -[NSPathCell setURL:] () Could maybe, NSPathControl get the display name etc. asynchronously? and maybe just stick raw path components in as a placeholder while it is reading async? Or something like that? If I can preload the resource keys it needs I would but once the NSURL asks on the main main thread I think it will just dump the cache out, per the run loop rules.

Since macOS 26 Beta 1, I notice that the window reopening behavior had changed. Say there are two desktops (spaces), one might: open an app window in desktop 1 close that window switch to desktop 2 reopen the app window (by click on dock tile, spotlight search...) Prior to macOS 26, that window will always reopen in current desktop. This is IMO the right behavior because these windows are most likely transient (message app, chat app, utilities app or note app). In macOS 26, however, will switch to desktop 1 (where the window is closed) and reopen the window in desktop 1. This is weird to me because: Window is "closed", hence it should not be attached to desktop 1 anymore, unlike minimize. Switching desktop interrupts user's current workflow. It's annoying to switch back specially when there're many desktops. This behavior is inconsistent. Some reopen in current desktop, some reopen in previous desktop. Apps like Music, Notes and Calendar reopened in previous desktop, while Mail, Messages, and Freeform reopened in current desktop. I did a little bit of experiment, and find out that apps that reopened in current desktop are most likely because they take an extra step to release the window when it's closed. I believe this is a bug, so I fire a feedback (FB18016497) back in beta 1. But I did not get any response or similar report from others, to a point that I kinda wonder if this is intended. I can easily force my app to reopen in current desktop by nullifying my window controller in windowWillClose, but this behavior essentially change how one can use the Spaces feature that I think I should bring this up to the community and see what other developers or engineers thinks about it.

I have regular NSImage from iPhone and the drawing get's extremely choppy during window resize (especially at small window sizes below 100px). When the window size is large there is no problem with drawing and CPU utilization is low. I have tried kCGImageSourceDecodeToSDR + or another NSImage from CGImage but the CPU utilization is extreme at small sizes. Non-HDR images don't have problems with drawing at small sizes. Video example: https://youtu.be/x8iAYGCyACs import AppKit import AVFoundation class ImageBackgroundView: NSView { @Invalidating(.display) var image: NSImage? = nil override var clipsToBounds: Bool { set { } get { true } } override func draw(_ dirtyRect: NSRect) { super.draw(dirtyRect) NSColor.red.setFill() dirtyRect.fill() guard let image = image else { return } // Calculate aspect-fit rect using AVFoundation let imageSize = image.size let targetRect = bounds let drawRect = AVMakeRect(aspectRatio: imageSize, insideRect: targetRect) image.draw(in: drawRect) } } Copy import Cocoa import UniformTypeIdentifiers class ViewController: NSViewController { @IBOutlet weak var imageView: ImageBackgroundView! @IBAction func buttonAction(_ sender: Any) { let panel = NSOpenPanel() panel.allowedContentTypes = NSImage.imageTypes.compactMap { UTType($0) } panel.begin { response in let nonHDROptions = [ kCGImageSourceDecodeRequest : kCGImageSourceDecodeToSDR, kCGImageSourceDecodeRequestOptions: [kCGComputeHDRStats: false] ] as CFDictionary guard response == .OK, let url = panel.url, let source = CGImageSourceCreateWithURL(url as CFURL, nil), let cgImage = CGImageSourceCreateImageAtIndex(source, 0, nonHDROptions) else { return } self.imageView.image = NSImage(cgImage: cgImage, size: NSMakeSize(CGFloat(cgImage.width), CGFloat(cgImage.height))) } } } Time profiler with HDR NSImage: Time profiler with NSImage + kCGImageSourceDecodeToSDR:

I have a textfield in accessory view of NSSavePanel. For user convenience there are default actions supported natively by macOS (such as pressing Enter, keyEquivalent). However this doesn't work for enter under Sonoma. Escape key works. Is enter keypress dangerous for malicious actors so it's not supported? I have workaround below but I am not confident if I am not violating sandbox (future proof). Original code demonstrating the issue: class ViewController: NSViewController, NSTextFieldDelegate, NSControlTextEditingDelegate { let savePanel = NSSavePanel() override func viewDidLoad() { super.viewDidLoad() let customView = NSView() let textField = NSTextField(string: "11111111") textField.delegate = self // to get focus using tab keypress savePanel.accessoryView = textField } override func viewWillAppear() { savePanel.runModal() } } Workaround: // variable set to true in delegate method controlTextDidEndEditing var didUseTextFieldWithEnterPressed = false override func performKeyEquivalent(with event: NSEvent) -> Bool { if #unavailable(macOS 14) { return super.performKeyEquivalent(with: event) } guard let panel, didUseTextFieldWithEnterPressed == true, event.type == .keyDown && (event.keyCode == UInt16(kVK_Return) || event.keyCode == UInt16(kVK_ANSI_KeypadEnter)) else { return super.performKeyEquivalent(with: event) } return panel.performKeyEquivalent(with: event) }

This is a generic, non-developer related macOS issue, but reporting here as well so it has more visibility since. It is an embarrassing bug that has not been fixed since the earliest versions of macOS Tahoe. Issue description: When Dock Magnification is enabled, the Dock Folder abruptly jumps approx. 10-15pixels down as the user moves the cursor after a brief pause). Video about the issue (see the last second of the small video and observe the entire grid popup jump abruptly): https://forums.macrumors.com/threads/macos-tahoe-26-4-release-candidate-now-available.2479503/post-34494643 Related FB: FB20761846 (opened in October, 2025) The issue is easily reproducible and confirmed by many. The lack of this issue being fixed for so long is indicative in the eyes of many of the lack of attention to details in macOS Tahoe's Glass interface.

If I see it correctly, it is currently not possible to validate a drop operation on a DynamicViewContent when using dropDestination? Just a simple example: Let's say I build a folder view on macOS where I can arrange folders freely. In this case I need to use DynamicViewContent.dropDestination to get an insertion index on drop. However, it seems that methods like dropConfiguration do not have any effect. Als dropDestionation(…, isTargeted:) seems not to be available. Here is my sample code: struct FolderRow: View { let folder: Folder var body: some View { DisclosureGroup(isExpanded: .constant(true)) { ForEach(folder.children) { child in FolderRow(folder: child) } .dropDestination(for: Folder.self) { item, idx in print("Dropped at \(idx)") } } label: { Label(folder.name, systemImage: "folder") .draggable(folder) .dropDestination(for: Folder.self) { items, _ in print("Dropped on Item") } } .dropConfiguration { session in DropConfiguration(operation: .move) } } } struct ContentView: View { @State private var folder: Folder = Folder.sampleData @State private var selection: Set<UUID> = [] var body: some View { NavigationSplitView { List(selection: $selection) { FolderRow(folder: folder) } } detail: { EmptyView() } } } The dropConfiguration is applied on the Label (in this case the "Move" cursor is used instead of the "Copy" cursor). Is there any way to do that or is it just an omission in Swift UI?

So I'm in the middle of an asynchronous file operation. I publish an NSProgress and it displays wonderfully in Finder. But it is a folder and while the operation is in progress the user should not be allowed to enter it, modify it, etc, while the work is being done. I want to do this to protect the user from doing something silly. But Finder does not prevent the selection with the published progress. And while it would be kind of dumb to do - the user can just go about adding/removing contents to the folder while it has progress. If I remember correctly publishing an NSProgress did use to prevent the file from being selectable in Finder until either the progress finished or my app is quit (or maybe not)? But now the user is free to select, edit, modify during progress which could cause problems if the user does something unexpectedly silly. Is there a way to mark the file 'unselectable' with the published progress? Thanks in advance.

A user of my app sent me a crash report. I have never seen one like this before. All of my app's symbols are replaced with three question marks (???) Thread 0 Crashed:: Dispatch queue: com.apple.main-thread 0 ??? 0x10844eb40 ??? 1 CoreFoundation 0x7ff80f155518 __CFNOTIFICATIONCENTER_IS_CALLING_OUT_TO_AN_OBSERVER__ + 137 and the binary image as 0x0 - 0xffffffffffffffff ??? (*) <00000000-0000-0000-0000-000000000000> ??? so I cannot find out where exactly the crash happened. What can cause this kind of crash report and can I do anything with it? crash.ips

This example application crashes when entering any text to the token field with FAULT: NSGenericException: The window has been marked as needing another Update Constraints in Window pass, but it has already had more Update Constraints in Window passes than there are views in the window. The app uses controlTextDidChange to update a live preview where it accesses the objectValue of the token field. If one character is entered, it also looks like the NSTokenFieldDelegate methods tokenField(_:styleForRepresentedObject:) tokenField(_:editingStringForRepresentedObject:) tokenField(_:representedObjectForEditing:) are called more than 10000 times until the example app crashes on macOS Tahoe 26 beta 6. I've reported this issue with beta 1 as FB18088608, but haven't heard back so far. I have multiple occurrences of this issue in my app, which is working fine on previous versions of macOS. I haven't found a workaround yet, and I’m getting anxious of this issue persisting into the official release.

I’m embedding an NSTextView (TextKit 2) inside a SwiftUI app using NSViewRepresentable. I’m trying to highlight dynamic subranges (changing as the user types) by providing per-range rendering attributes via NSTextLayoutManager’s rendering-attributes mechanism. The issue: the highlight is unreliable. Often, the highlight doesn’t appear at all even though the delegate/data source is returning attributes for the expected range. Sometimes it appears once, but then it stops updating even when the underlying “highlight range” changes. This feels related to SwiftUI - AppKit layout issue when using NSViewRepresentable (as said in https://developer.apple.com/documentation/swiftui/nsviewrepresentable). What I’ve tried Updating the state that drives the highlight range and invalidating layout fragments / asking for relayout Ensuring all updates happen on the main thread. Calling setNeedsDisplay(_:) on the NSViewRepresentable’s underlying view. Toggling the SwiftUI view identity (e.g. .id(...)) to force reconstruction (works, but too expensive / loses state). Question In a SwiftUI + NSViewRepresentable setup with TextKit 2, what is the correct way to make NSTextLayoutManager re-query and redraw rendering attributes when my highlight ranges change? Is there a recommended invalidation call for TextKit 2 to trigger re-rendering of rendering attributes? Or is this a known limitation when hosting NSTextView inside SwiftUI, where rendering attributes aren’t reliably invalidated? If this approach is fragile, is there a better pattern for dynamic highlights that avoids mutating the attributed string (to prevent layout/scroll jitter)?

When I end editing pressing the escape key, the system sometimes plays NSBeep(). I noticed this with NSBrowser. Every time I press escape to end editing the system beeps. At first I thought it was somewhere in my app but I set a symbolic breakpoint and discovered it was not coming from my code. I filed FB22127038. Since then I discovered that NSBeep playing at inappropriate times is not exclusive to NSBrowser. It appears if there is a NSTableView in the window and you just press the escape key (even if you aren't editing anything) AppKit beeps. It can be traced to: #0 0x0000000199e3184c in NSBeep () #1 0x000000019aa03fac in -[NSWindow doCommandBySelector:] () #2 0x000000019ac1d01c in -[NSTableView(NSTableViewViewBased) cancelOperation:] ()

I have received a few crash reports for my app "Find Any File" with an assertion failure as follows: assertion failure: "displayTiming != ((void *)0)" -&gt; %lld Googling this turns up nothing, though. I wonder if someone has some insight into why this might happen, and how to prevent it. One reporting user suggests that it happens when my app shows a very long list of items in an NSTableView (&gt;10000 elements). I have 4 reports from 3 users, and the main thread is doing something related to the table view each time, though not the same (the few other threads are all idle): Crash 1, in macOS 14.0 (23A344: Thread 0:: Dispatch queue: com.apple.main-thread 0 libobjc.A.dylib 0x182c69400 objc_msgSend + 0 1 AppKit 0x186f15400 -[CALayer(NSViewVisibleRect) NS_viewVisibleRectDidChange] + 40 2 AppKit 0x186900e10 NSViewHierarchyInvalidateVisibleRect + 276 3 AppKit 0x186900db0 NSViewHierarchyInvalidateVisibleRect + 180 4 AppKit 0x186900db0 NSViewHierarchyInvalidateVisibleRect + 180 5 AppKit 0x186900db0 NSViewHierarchyInvalidateVisibleRect + 180 6 AppKit 0x186900db0 NSViewHierarchyInvalidateVisibleRect + 180 7 AppKit 0x186900db0 NSViewHierarchyInvalidateVisibleRect + 180 8 AppKit 0x1869990e0 -[NSView translateOriginToPoint:] + 164 9 AppKit 0x186984108 -[NSClipView _immediateScrollToPoint:] + 420 10 AppKit 0x186983eb8 -[NSClipView scrollToPoint:] + 184 11 AppKit 0x186998d80 -[NSScrollView scrollClipView:toPoint:] + 84 12 AppKit 0x1869448dc -[NSClipView _scrollTo:animateScroll:flashScrollerKnobs:] + 480 13 AppKit 0x186b65b24 __62-[NSScrollingBehaviorConcurrentVBL _stopGestureScrollTracking]_block_invoke + 192 14 AppKit 0x186e6a6e8 ___NSMainRunLoopPerformBlockInModes_block_invoke + 44 15 CoreFoundation 0x18310b8c0 __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 28 Crash 2, in macOS 14.1.1 (23B81): Thread 0:: Dispatch queue: com.apple.main-thread 0 CoreFoundation 0x18ba401f4 DYLD-STUB$$_Block_object_assign + 0 1 libsystem_blocks.dylib 0x18b506118 _call_copy_helpers_excp + 80 2 libsystem_blocks.dylib 0x18b505c68 _Block_copy + 376 3 libdispatch.dylib 0x18b641c7c _dispatch_Block_copy + 32 4 libdispatch.dylib 0x18b658df0 _dispatch_source_set_handler + 92 5 CoreFoundation 0x18b99e1e4 __CFRunLoopCopyMode + 540 6 CoreFoundation 0x18b8b7458 CFRunLoopAddObserver + 220 7 AppKit 0x18f0a687c _PerfAddRunLoopObserver + 192 8 AppKit 0x18f87cd60 -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 368 9 AppKit 0x18f323318 -[_NSScrollingConcurrentEventMonitor startMonitoring] + 380 10 AppKit 0x18f321df8 -[NSScrollingBehaviorConcurrentVBL _scrollView:trackGestureScrollWithEvent:] + 884 11 AppKit 0x18f2e67f8 -[NSScrollingBehaviorConcurrentVBL scrollView:scrollWheelWithEvent:] + 512 12 AppKit 0x18f241770 forwardMethod + 252 13 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 14 AppKit 0x18f241770 forwardMethod + 252 15 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 16 AppKit 0x18f241770 forwardMethod + 252 17 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 18 AppKit 0x18f241770 forwardMethod + 252 19 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 20 AppKit 0x18fc45880 -[NSCollectionView scrollWheel:] + 180 21 AppKit 0x18f241770 forwardMethod + 252 22 AppKit 0x18f241770 forwardMethod + 252 23 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 24 AppKit 0x18f241770 forwardMethod + 252 25 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 26 AppKit 0x18f241770 forwardMethod + 252 27 AppKit 0x18f2e62a0 -[NSView scrollWheel:] + 408 28 AppKit 0x18f1d27b0 -[NSWindow(NSEventRouting) _reallySendEvent:isDelayedEvent:] + 652 As you can see, there's no code of mine involved at the time of crash. The other (and older) reports are similar, in macOS 13.6.1 and macOS 13.1. All four happened on ARM architecture (which may not be significant due to small number of samples). Memory use of app was not critical (in one case it was about 9 GB total, in others below 4 GB). The "Binary Images" section only lists Apple libs, apart from my app's. So, there seems to be no 3rd party ext involved. I've attached a full report as well. Full report of Crash 1

I'd like to create a Quick Look extension for a file type for which a location or region on a Map should be shown as preview. However the MapView would only show a grid without any map. From within the MapKit delegate I can see from the "Error" parameter (a server with this domain can not be found) that this seems to be a network issue. The Quick Look extension seems to have no access to the internet and therefore the MapView can not load any map data. I've then also done some other tests via URLSession, which also only fails with connection errors. I haven't seen any limitations or restrictions mentioned in the API documentation. Is this the expected behavior? Is this a bug? Or am I missing something?

Hello Using a MacBook Pro Intel with macOS 12.7.6 Monterey, I test in Objective-C an event for the option key but it is not working - (void)keyDown:(NSEvent *)event { printf("%s %p\n", __FUNCTION__, self); BOOL altFlag = [event modifierFlags] & NSEventModifierFlagOption; if (altFlag) { // UpdateClass printf("option pressed\n"); } else { printf("option not pressed\n"); } } The same in Swift works fine override func keyDown(with event: NSEvent) { if event.modifierFlags.contains(.option) { print("option pressed") } else { print("option NOT pressed") } } The Obj-C code works fine on a MacBook Air Tahoe 26.3 Any idea why it does not work on the macOS 12.7.6 Intel? Many Thanks Jean

In this code, I use in some places required init?(coder: (NSCoder?)) { // Init some properties super.init(coder: coder!) } And in other places required init?(coder: NSCoder) { super.init(coder: coder) // Init some properties } Both seem to work. Is there a preferred one ? In which cases ? Or should I always use the second one ? And can super be called at anytime ?

In this Mac App, I have an IBOutlet (which is defined as instance of a subclass of NSView). When I connect the IBOutlet to the code, referencing as file's owner, it works OK. But if I reference to the class, it crashes, when I access a specific IBOutlet (but other IBOutlets are accessed just before it without crashing).. The IBOutlet turnPageControl is defined as instance of subclass of NSView. Note: I have implemented several init methods: override init(window: NSWindow!) { } required init?(coder: (NSCoder?)) { } // Yes, (NSCoder?) convenience init(parameters) { // loading from nib } override func windowDidLoad() { super.windowDidLoad() // Access turnpageControl I get those calls before crash: init(window:) init(parameters:) init(window:) windowDidLoad() -> crash inside on accessing the IBOutlet for turnPageControl.isHidden = true Is there any reason to this ?

I started a project targeting macOS and used Storyboard app lifecycle. I also used Xcode Previews in this project. If I: Keep the entry point of the main storyboard to a window controller. (as default setup in macOS), Turn the Xcode window into full-screen, That window controller would pop up its window every time Xcode Previews refreshes. I tested in Xcode 26.3 RC and many versions before.