So using the class constructor is pretty much the only reasonable way around this. I'm marking this reply as the correct answer. You can also avoid the crash by setting UIDesignRequiresCompatibility to YES in your Info.plist and use the pre Liquid Glass UI. maybe I'd file a bug but I don't think Apple responded to like 95% of my Catalyst bugs I reported in the past. I must have reported more than a dozen so I'm not going to be filing this one. FYI if you migrate to the group class constructor... if you have to do any per item tweaks you can apparently just dig in the subitems array right after you create the GroupItem (to set different actions on particular subitems etc.) HOPEFULLY they don't release an update that breaks that.

This API is broken in AppKit land as well. Also experienced another exception when rerunning the app... the system throws up an alert like: "App crashed while reopening windows - Do you want to reopen windows again" error. If you choose to reopen windows in the alert we get another exception: ** Assertion failure in -[UINSAppKitTerminationController launchingDidComplete], UINSAppKitTerminationController.m:71

Also I lose the ability to set the itemIdentifier property on subitems when creating the NSToolbarItemGroup with the class constructor. Presumably the subitem is still the sender when NSToolbarItem invokes its action? Being able to define itemIdentifier on subitem can sometimes be useful. I guess I can use tag instead but feels like a lot of busy work here. Err

Ya using +groupWithItemIdentifier:images:selectionMode:labels:target:action: avoids the crash. So under this API design am I permitted to do this? NSToolbarItemGroup *readStatusToolbarGroup = [NSToolbarItemGroup groupWithItemIdentifier:itemIdentifier images:@[mailOpenEnvelopeImage, mailBadgedEnvelopeImage] selectionMode:NSToolbarItemGroupSelectionModeSelectOne labels:@[@"Read",@"Unread"] target:nil action:nil]; NSUInteger i = 0; for (NSToolbarItem *aItem in readStatusToolbarGroup.subitems) { if (i == 0) { aItem.action = @selector(markRead:); aItem.toolTip = @"Tooltip for this one.."; } else if (i == 1) { aItem.action = @selector(markUnread:); aItem.toolTip = @"Tooltip for this one..."; } i++; } This API design is not very good TBH. I'm not really happy about having to rewrite the code to build four toolbar groups (I already did this work). I'd like to move forward instead of running in place all the time. BTW the appearance of the toolbar groups don't look particularly special when created via the group class constructor so I dk what's with all the system appearance talk. It isn't clear to me why the underlying implementation can't build the toolbar properly in the same way from -setSubItems: These toolbar items just get images and titles I'm not even using a custom view for the toolbar item.

This is still a thing. I have a UIToolbar with some buttons in it. They are are created in Interface Builder. One is hidden. At runtime, something happens and I set hidden = NO to show that one button that is hidden and nothing happens. I see UIToolbar is now a wrapper on top of SwiftUI on iOS 26 so while this is disappointing this type of bug isn't really shocking. @N. Holzschuch Thanks for sharing. Setting the items like it's iOS 15.0 does the trick. I tried just resetting the property with a copy of the .items array but it didn't work. Adding a dummy bar button item then removing it seems to be required.

Okay so I moved the path to Contents/Helpers. I tested in a Virtual Machine (though not a complete fresh one) but it seems the services for the app in Contents/Helpers are indeed discoverable. So over the last 8 years I either misremembered my reason for choosing Contents/Applications/ or I made a mistake or this was an issue that was resolved during that time. In any case I think the complete answer is: Use Contents/Helpers instead of Contents/Applications to get the app out of the Spotlight app launcher on Tahoe. Thanks for your help

You can quite easily see NSScrollView jitter/stall if you open a Finder window -> Icon view -> Use Groups -> yes. Make sure the folder you are viewing has a few collapsable sections. Collapse some of them. Then start vertically scrolling top to bottom. Scrolling will get interrupted often when the cursor moves over the collapsed sections. The scrollbar will freeze visible until you click somewhere and then the scrolling animation will start. You might think the horizontal scrolling of the collapsed section is colliding with the vertical scrolling and that that is causing the stutter but that's not what's happening. In my testing I can just stick a subview partially outside the bounds of the document view (but not increase the width of the document view so horizontal scrolling is not enabled) and the same stutter occurs. I went back to macOS Monterey and tried to reproduce but could not. Not sure when this bug came about. But adjusting the scroll point in a -scrollWheel: override without calling super avoids the issue and scrolling seems much more responsive. I think just calling -scrollPoint: kicks off Core Animation implicit animations(?) they seem to do a good enough job.

I could be remembering wrong and maybe just switching the path would resolve but is Spotlight indexing required to get the .app's NSServices to appear in the Services menu? Sorry for the double reply and the re-ask, but I was still wondering about this. I am planning on changing the Path to Contents/Helpers and testing in a virtual environment in case there is any caching etc. as it related to Services to see if it works. These helper apps need their Services to be discovered by the system and is core to their functionality so if that somehow requires Spotlight indexing or being registered with Launch services or whatever I can't change the path. If you have any knowledge about this that could save me some time so I don't go on a wild goose chase that would be awesome. I could be misremembering all this because of the amount of time that has passed since I set all this up but I think I changed the path to "/Contents/Applications/" because I otherwise couldn't get the Services to show up. If Services are expected to be discovered for helper apps in Contents/Helpers/ then I'll go ahead and try moving them but if you already know that that's just not going to work for my use case that would be great to know ahead of time.

So I had to pepper a few of these around: // NSButton image scaling changed in 26.1 with certain SF symbols? if (@available(macOS 26.1, *)) { // looks better on 26.1 button.imageScaling = NSImageScaleProportionallyDown; } else { // looks better on 26.0. button.imageScaling = NSImageScaleProportionallyUpOrDown; } And one of these for a symbol image... NSImageSymbolScale symbolScale; if (@available(macOS 26.1, *)) { // large is too big on on 26.1 so let's go down to medium symbolScale = NSImageSymbolScaleMedium; } else { // need large on 26.0 symbolScale = NSImageSymbolScaleLarge; } NSImage *symbol = // make image with symbolScale and use it in a NSButton

I filed: FB21013306

I just ran into an issue where NSScrollView got stuck mid scroll. I answered in another thread here: https://developer.apple.com/forums/thread/748826?answerId=865833022#865833022 My simple override of scrollWheel: fixed the issue for me but I do lose the "rubber band" bounce back effect shouldn't be too hard to implement it but I'd rather not right now. I'll give up the rubber band bounce back in exchange for having a scroll view that doesn't freeze mid-scroll. I tried overriding +isCompatibleWithResponsiveScrolling and returning NO but it was never called on my NSScrollView subclass for some reason.

I'm not sure if our issues are exactly the same but in my case when scrolling gets stuck the scroll bar also remains visible like it's paused until I mouse click and the scroll position jumps for all the skipped frames. I dk if they are pausing a private CADisplayLink or something erroneously. Something not nice is going on with NSScrollView here! A subview sticking out partially on a horizontal edge slightly seems to trigger it for me. So regardless of whether or not I have subviews sticking out on the right or left edge of the scroll view it seems I can achieve "butter vertical scrolling" simply by overriding -scrollWheel: in the 'document view' subclass and moving the scroll point myself without calling super.... -(void)scrollWheel:(NSEvent*)event { CGFloat deltaY = (event.hasPreciseScrollingDeltas) ? event.scrollingDeltaY : event.scrollingDeltaY * self.enclosingScrollView.verticalLineScroll; NSRect currentVisibleRect = self.visibleRect; CGPoint scrollPoint = currentVisibleRect.origin; scrollPoint.y = scrollPoint.y - deltaY; [self scrollPoint:scrollPoint]; } I wish I didn't spend half a day on this!!!!

so it looks like if one subview of the document view extends past its NSMaxX(self.bounds) even partially two finger drag scrolling can stutter when scrolling is initiated from around this area of the scroll view. I don't want to widen the document view because I actually don't want horizontal scrolling in this case

Did you ever find a solution to this? I'm running into an issue where two finger scrolling on a Magic Trackpad can occasionally be interrupted. In my case the documentView is only scrollable vertically. But there is a situation (intentionally) where some subviews of the document view are positioned outside of the visible region on the x-axis (say extended a bit beyond NSMaxX of the visibleRect or before before NSMinX, not too many views though). We can call this a "row" of subviews. When the mouse is hovered over this row on the Y-axis (with the views off screen) when vertical scrolling first starts scrolling can be interrupted. I tried all sorts of things like setting clipsToBounds YES on the a bunch parent views and even the document view itself thinking drawing outside the visible area has something to do with this laggy scroll. This only occurs with two finger drag on a Magic Trackpad (not sure about Magic Mouse because I don't have one) but I have a non-Apple scroll wheel mouse and vertical scrolling never seems to be interrupted. At first I though my -scrollWheel override did it so I took it out and it but the problem still occurs.

Fixing the header view frames like this seems to work. NSSet <NSIndexPath*> *theIndexPaths = [collectionView indexPathsForVisibleSupplementaryElementsOfKind:NSCollectionElementKindSectionHeader]; for (NSIndexPath *aIndexPath in theIndexPaths) { NSView *headerView = [collectionView supplementaryViewForElementKind:NSCollectionElementKindSectionHeader atIndexPath:aIndexPath]; NSView *headerViewSuperview = headerView.superview; NSCollectionViewLayoutAttributes *headerLayoutAttributes = [collectionView layoutAttributesForSupplementaryElementOfKind:NSCollectionElementKindSectionHeader atIndexPath:aIndexPath]; if (headerView != nil && headerViewSuperview != nil && headerLayoutAttributes != nil) { NSRect headerViewRect = headerView.frame; NSRect targetRect = [headerViewSuperview convertRect:headerLayoutAttributes.frame fromView:collectionView]; if (!NSEqualRects(targetRect, headerViewRect)) { headerView.frame = targetRect; } else { // frame okay } } else { os_log_fault(OS_LOG_DEFAULT, "Header view in visible region not properly set up."); } } I'll probably wrap it in a category method