I'm encountering a crash issue in my macOS application when clicking on the view generated by AppKit's showDefinition(for:at) function. I'm seeking assistance to resolve this issue. **Problem Description: ** I'm developing a macOS application where I utilize the showDefinition(for:at) function provided by AppKit to display the definition view of words. However, whenever I click on this view, the application crashes abruptly. **Error Message: ** The crash log reveals the following error message: Fault: deferNSXPCInvocationOntoMainThread_block_invoke caught NSInternalInconsistencyException '_CPSSetFrontProcessWithOptions failed due to CGError -606 4294966690 fffffda2 (appIsDaemon)' Attempts Made: Tried wrapping relevant code blocks with DispatchQueue.main.async, suspecting a threading issue. Making the DefinitionWindow variable a global one to manually control its lifecycle Development Environment: macOS Version: 14.3.1 Xcode Version: 15 Below is a complete and reproducible code snippet that can be directly executed within a terminal project template. Please note that it requires Accessibility permissions to be granted in the Privacy settings. import Cocoa import SwiftUI import AppKit class AppDelegate: NSObject, NSApplicationDelegate { func applicationDidFinishLaunching(_ notification: Notification) { NSEvent.addGlobalMonitorForEvents(matching: .keyDown) { [weak self] event in guard let self = self else { return } if event.modifierFlags.contains(.command) && event.charactersIgnoringModifiers == "c" { self.ShowWordDefinition() } } NSApp.servicesProvider = self NSApp.registerServicesMenuSendTypes([.string], returnTypes: []) } func ShowWordDefinition(){ DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { let attributedString = NSAttributedString(string:NSPasteboard.general.string(forType: .string)!) let DefinitionWindow = NSWindow(contentRect: NSRect(origin: .zero, size: NSSize(width: 1, height: 1)), styleMask: [.borderless], backing: .buffered, defer: false) // on the top DefinitionWindow.level = .floating let pointInWindow = NSPoint(x:0,y:0); //default value DefinitionWindow.contentView?.showDefinition(for: attributedString, at: pointInWindow) DefinitionWindow.orderFront(nil) } } } let delegate = AppDelegate() let app = NSApplication.shared app.delegate = delegate app.run() full crash log reveals the following error message: FAULT: deferNSXPCInvocationOntoMainThread_block_invoke caught NSInternalInconsistencyException '_CPSSetFrontProcessWithOptions failed due to CGError -606 4294966690 fffffda2 (appIsDaemon)' with backtrace ( "0 CoreFoundation __exceptionPreprocess + 176", "1 libobjc.A.dylib objc_exception_throw + 60", "2 CoreFoundation +[NSException exceptionWithName:reason:userInfo:] + 0", "3 ViewBridge assertCGError + 80", "4 ViewBridge -[NSRemoteView _serviceWindowWouldActivate] + 724", "5 CoreFoundation __invoking___ + 148", "6 CoreFoundation -[NSInvocation invoke] + 428", "7 ViewBridge __deferNSXPCInvocationOntoMainThread_block_invoke + 120", "8 ViewBridge __wrapBlockWithVoucher_block_invoke + 56", "9 ViewBridge deferredBlockOpportunity_block_invoke_2 + 360", "10 CoreFoundation __CFRUNLOOP_IS_CALLING_OUT_TO_A_BLOCK__ + 28", "11 CoreFoundation __CFRunLoopDoBlocks + 356", "12 CoreFoundation __CFRunLoopRun + 2440", "13 CoreFoundation CFRunLoopRunSpecific + 608", "14 HIToolbox RunCurrentEventLoopInMode + 292", "15 HIToolbox ReceiveNextEventCommon + 648", "16 HIToolbox _BlockUntilNextEventMatchingListInModeWithFilter + 76", "17 AppKit _DPSNextEvent + 660", "18 AppKit -[NSApplication(NSEventRouting) _nextEventMatchingEventMask:untilDate:inMode:dequeue:] + 716", "19 AppKit -[NSApplication run] + 476", "20 try main + 160", "21 dyld start + 2360" ) Just a reminder, the application will crash when you click on the displayed definition window. Potential Questions and Concerns: Could there be an issue related to UI transitions or the main thread? How exactly does the showDefinition(for:at) process work internally? Maybe , the view's display level being raised when clicked caused conflict? If anyone could provide any insights or guidance on resolving this issue, it would be greatly appreciated. Thank you!

I calculate cell view's width in func tableView(_ tableView: NSTableView, sizeToFitWidthOfColumn column: Int). I have a need to resize the tableview's width to just match total width of all cell views' (without scrollbars). But it seems changing tableview's width does not work: tableView.bounds.size = CGSize(width: w, height: tableView.bounds.height) I suspect that I should change its clipping view or enclosing scrollview, but don't have any idea on this. Any help?

Wanted to add some basic scripting capabilities for an AppKit Swift application on macOS. I looked at adding AppleScript support (i.e. Cocoa Scripting) and it, frankly, hurts my head. I then discovered that Swift provides for CommandLine.argc and Commandline.arguments. So, from Terminal, I can do open -a myApp --args arg1 arg2 arg3 and sure enough, MyApp starts and CommandLine.arguments contain arg1, arg2, arg3 along w/ the first entry which is the fully resolved path of the executable. Great! However, if myApp is already running when I execute open -a myApp --args arg4 CommandLine.arguments are not updated and I get the same values as when I originally started the program (i.e. arg1, arg2, arg3 and not arg4). So I added func applicationShouldHandleReopen(_ sender: NSApplication, hasVisibleWindows flag: Bool) -> Bool { parseCommandLine(); return true} to AppDelegate and while parseCommandLine is called for my second open -a command, it still points to the old CommandLine.arguments. Even tried returning false, but no difference. Is there a way for CommandLine to be refreshed if myApp is already running? Or a different way to get the same effect?

I tried many ways but it seems I just cannot get it working. // AppDelegate func applicationShouldTerminateAfterLastWindowClosed(_ sender: NSApplication) -> Bool { true // false does not work either } // MainWC func windowShouldClose(_ sender: NSWindow) -> Bool { print(#function) if sender === NSApp.mainWindow { print("is main window") sender.setIsVisible(false) return false } return true } Once I hide the main window (using setIsVisible or orderOut) the app quits; even if I return false from applicationShouldTerminateAfterLastWindowClosed, NSApp.mainWindow will become nil.

What unit does NSView.bounds/frame use? Pixel or point? How to convert between them?

I have an uncommon scenario here. outer tableview +--------------------------+ | column 1| inner tableview| +--------------------------+ Now most often the out tableview has many rows and vertical scrollbar visible. When user try to scroll vertically in the inner tableview but it has no vertical scrollbar (because it has only a few items), I want the scroll event sink into its parent view or better outer tableview, so that user does not have to move cursor to first column in outer tableview and scrolls. Is this possible?

I have a tableview with a column which has an inner tableview. I want to change height of the outer tableview to match the height of the inner tableview. outerTableView.reloadData() let range = outerTableView.rows(in: summaryTableView.superview!.visibleRect) outerTableView.noteHeightOfRows(withIndexesChanged: IndexSet(integersIn: range.lowerBound..<range.upperBound)) The above code will cause an exception: WARNING: NSTableView detected a rowView was requested from inside of the -heightOfRow delegate method. That is not supported! ( 0 CoreFoundation 0x000000019093eccc __exceptionPreprocess + 176 1 libobjc.A.dylib 0x0000000190426788 objc_exception_throw + 60 2 AppKit 0x000000019420be98 -[NSTableRowData _availableRowViewWhileUpdatingAtRow:] + 0 3 AppKit 0x000000019425a470 -[NSTableView viewAtColumn:row:makeIfNecessary:] + 32

I am no expert at coordinate systems. I am kind of aware I can use its enclosingScrollView but don't know the details. Any suggestions would be appreciated.

To me, the documentation for this method is not at all clear and needs to provide sample code. I tried searching the dev site for sample projects, but they're no longer where they lived for decades before. And where's the TextEdit sample project?! I need to override shouldCloseWindowController so I can make sure some sub-windows can be closed before closing the document's one and only window. I've done that, but then have no idea what I'm supposed to do to all the document to close. I tried this, which is what I think the NSDocument version header says to do: if ((self.windowControllers.first?.shouldCloseDocument) != nil){ self.canClose(withDelegate:delegate as Any, shouldClose:shouldCloseSelector, contextInfo:contextInfo); } But the document never gets the close() method called - only the window goes away.

Does "natural scrolling" system preference affect NSEvent.scrollingDeltaY? BTW, I find that "natural scrolling" on my Sonoma (Mac mini m1) stops working; turning on/off has no effect when I scroll in Finder app.

-1 I am trying to write a MacOS app which switch input methods by previously assigned shortcut(command+space in here). Switching input methods preoperly works so that the language icon at the status bar(top right) immediately changes as I put the shortcut. The problem I got in here is that the actual input method does not change. For example, if I run my app when the selected input method is Korean, then although the status bar is showing the selected input method is Japanese after command+space, what I can only type is Korean characters. However, after I change focus to another text app(e.g. from sublime text to xcode), only then the selected input method is reflected well. I am using MacOS Monterey 12.6 and Xcode 13.1. My project contains two source files. The code in the file AppDelegate.swift is as follows: import Cocoa @NSApplicationMain class AppDelegate: NSObject, NSApplicationDelegate { var switcher = Switcher() } And the code in the file Switcher.swift is as follows: import Cocoa import MASShortcut class Switcher{ var lang: Int = 0 var kr: TISInputSource? var jp: TISInputSource? var en: TISInputSource? init(){ let inputSourceNSArray = TISCreateInputSourceList(nil, false).takeRetainedValue() as NSArray let inputSourceList = inputSourceNSArray as! [TISInputSource] for inputSource in inputSourceList { if inputSource.id == "com.apple.inputmethod.Korean.2SetKorean" { self.kr = inputSource } if inputSource.id == "com.apple.inputmethod.Kotoeri.RomajiTyping.Japanese" { self.jp = inputSource } if inputSource.id == "com.apple.keylayout.ABC" { self.en = inputSource } } self.register() } func switchLang(){ self.lang = (self.lang + 1) % 3 switch lang { case 0: TISSelectInputSource(self.kr) case 1: TISSelectInputSource(self.jp) case 2: TISSelectInputSource(self.en) default: print("error") } } func register() { let langShortcut = MASShortcut(keyCode: kVK_Space, modifierFlags: [.command]) MASShortcutMonitor.shared()?.register(langShortcut, withAction: { self.switchLang() }) } } I wrote these codes by referring KAWA, but KAWA does not make this issue. I have analyzed all codes of KAWA several times, I couldn't find out why the same problem does not occur in KAWA. I am quite new to Swift, and I have no idea to approach. Could you help me....? Thank you.

Using NSMenuItem's delegate method menu(_ menu: NSMenu, willHighlight item: NSMenuItem?) should return a nil item when the mouse location is moved out of the NSMenu window or if any of the items should not be highlighted. As per Apple Developer website: Only one item per menu can be highlighted at a time. If item is nil, it means that all items in the menu are about to be unhighlighted. But, on macOS Sonoma, when moving the mouse over a .sectionHeader and/or a Separator item, willHighlight won't be called, which makes it not return any item (neither nil, nor the section header). This behavior makes it impossible to use willHighlight method to determine whether custom views should be highlighted or not. Is this a bug or expected behavior?

I have a document class that makes a main window for showing the data. Pieces of that data can be opened in separate subwindows for editing. When the user closes the main window and the document is dirty and the subwindows are dirty, I would like to present UI that asks the user if they want to save the changes in the subwindows (and possibly the main window if I decide to turn off autoSavesInPlace for the document). I've tried a number of possible methods of doing this, but always run into some roadblock: -Overriding shouldCloseWindowController:delegate:shouldCloseSelector:contextInfo: where I would go through the open subwindows and asking and tell them to do their own UI for asking if they should be saved. This is no good because everything returns back to the run loop and the doc would close, leaving the subwindows open with their Save? sheets up. -Making the subwindows inherit from NSEditor and registering them with the document. This looked like it would work, but it caused an infinite loop in my override of commitEditingWithDelegate:didCommitSelector:contextInfo: that I don't understand. I'm probably calling the didCommitSelector wrong because the docs aren't clear and provide no example. -Adding each subwindow's NSWindowController to the document's windowControllers list. I don't recall the problems this caused. Any sage advice about this? Possible examples? The Document is Swift, the subwindows are Cocoa, so examples in either language is fine.

I have a fairly robust MacOS application that has an NSScrollView that contains a canvas with various subviews (including web views and text views that contain scroll views), and a couple of peer views that track items in the scroll view (eg: screen space controls). Some of these views interrupt two finger scrolling. Every scroll view, and one of the peer views (essentially a stack view with buttons in it). I have written an additional bare bones application which does roughly the same thing, and my bare bones application works perfectly: Start two-finger dragging, scroll any of these other things under the cursor, I can continue to drag (and start dragging in any of those, and they drag without interfering with the parent scroll view). I have tried everything to recreate the interruption, including drag gestures attached to these various ancillary views, and I cannot figure out why dragging some of these views under the cursor interrupts two finger drag in our application, but not in my testbed. Does anyone have suggestions for how to debug this? I can see that there is a gesture recognizer in the NSScrollView hierarchy, but I don't see it in any of my gesture recognizer handling. I have breakpoints on every variation of hit testing and mouse motion, and none of them are getting hit in unexpected ways. I'm at my wit's end. Thanks.

Specs: macOS Sonoma 14.3.1 Using NSMenu's submenus with a list of NSMenuItems (with or without custom views) will produce a hang for the first time they are presented. The larger the list, the more time the UI will be frozen before presenting the submenu. Is there something that can be done to mitigate this behavior?

Hello, When running an iPad app on Apple Silicon (M1) the expirationDate OptionKey of the UIPasteboard has no impact, i.e. the copied value is never removed from the clipboard. The following code works perfectly on iOS, however, behaves how I described above on macOS. let currentDate = Date() let expireDate = currentDate.addingTimeInterval(TimeInterval(90)) UIPasteboard.general.setItems([[UIPasteboard.typeAutomatic: myString]], options: [UIPasteboard.OptionsKey.expirationDate: expireDate]) Is this a bug? I am on Swift 5.10. Thank you!

Is there any way to keep an NSWindow always on top of other windows (inside an app)? I want to create a "preview" window for pictures and videos with it not taking up space in the main window.

Hi, I think the title says it: my application needs to obtain a list of all applications that are configured as potential editors of a certain file type, for example jpeg or tiff. I've found LSCopyAllRoleHandlersForContentType which appears to do what I need, but it is deprecated since macos 12.0. What's the modern alternative? My app is built in c++ with some objective-c. Thanks Joost

On a submenu (NSMenu), items that use custom views as part of their layout, do not call NSMenu's delegate willHighlight method. The method is called correctly when placing the same items with custom views inside the root/parent NSMenu. Steps Create a NSMenu with at least two NSMenuItem; One with a custom view and another without it. Add a submenu to the item without a custom view; make sure to set the submenu's delegate Add multiple items to the submenu; Make sure some of the items are using custom views Using one of NSMenu's delegate method, willHighlight, check if it will return an item when hovering over the custom view items inside the submenu Notice it will only return when hovering over items that do not use a custom view. Expected Result NSMenu's willHighlight method should be called and inform with item with custom view should be highlighted inside the submenu. Tests done on macOS 14.3.1 and 14.4.1. Xcode 15.2 and 15.3.

After popping up a NSMenu a few times, NSResponder's mouseExited event is called even when the cursor is inside the tracking area, returning the main app window's max X value, which makes the mouseEntered/Exited methods unusable for tracking whether or not cursor is currently inside the view's frame. Steps Create a NSMenuItem with a custom view inside Add a tracking area to the views frame Add a background color that changes on mouseEntered/Exited Open and close NSMenu a few times until the color starts flickering when moving the cursor inside the view's frame If possible, print out NSEvent's locationInWindow on both mouseEntered and Exited and see that the location for exited method is not being reported correctly, while the flickering from the bg color being set is happening. Expected Result mouseExited should only be called the cursor leaves the tracking area. locationInWindow values should not exceed the NSPopUpWindow's frame. Tested on macOS Sonoma 14.3.1 and 14.4.1; Xcode 15.2; Feedback ID https://feedbackassistant.apple.com/feedback/13698735