In TextKit 1 we have the method NSTextStorage.addLayoutManager(_:) that allows to show the same text in multiple text views. This method exists with NSLayoutManager but not with NsTextLayoutManager. Is there a way to achieve the same thing with TextKit 2?

With my continued experiments with TextKit2, I'm trying to figure out what sets the properties paragraphSeparatorRange and paragraphContentRange on a NSTextParagraph. These seem to be computed properties (or at least they cannot be directly set via public API). var paragraph = NSTextParagraph(attributedString: NSAttributedString(string: "It was the best of times.\n")) print("attributes: \(paragraph.attributedString.attributes(at: 0, effectiveRange: nil))") print("paragraphSeparatorRange: \(String(describing: paragraph.paragraphSeparatorRange))") print("paragraphContentRange: \(String(describing: paragraph.paragraphContentRange))") In the above example, both paragraphSeparatorRange and paragraphContentRange are nil. However, when using NSTextLayoutManager/NSTextContentStorage they are set. let layoutManager = NSTextLayoutManager() let container = NSTextContainer(size: NSSize(width: 400, height: 400)) layoutManager.textContainer = container let contentStorage = NSTextContentStorage() contentStorage.textStorage = NSTextStorage(string: "It was the best of times.\n") contentStorage.addTextLayoutManager(layoutManager) layoutManager.enumerateTextLayoutFragments(from: contentStorage.documentRange.location, options: .ensuresLayout) { textLayoutFragment in print("layoutFragment: \(textLayoutFragment)") print("textElement: \(String(describing: textLayoutFragment.textElement))") print("textElement.range: \(String(describing: textLayoutFragment.textElement?.elementRange))") let paragraph = textLayoutFragment.textElement as! NSTextParagraph print("paragraphContentRange: \(String(describing: paragraph.paragraphContentRange))") print("paragraphSeparatorRange: \(String(describing: paragraph.paragraphSeparatorRange))") return true } Would appreciate any ideas on how these values are computed/set. Thanks

I have been getting crash reports from users of my Mac app on Sonoma 14.0 and 14.1 when typing into an NSTextView subclass. The crash logs I have show involvement of the spell-checking system - NSTestCheckingController, NSSpellChecker, and NSCorrectionPanel. The crash is because of an exception being thrown. The throwing method is either [NSString getParagraphStart:end:contentsEnd:forRange:] or [NSTextStorage ensureAttributesAreFixedInRange:]. I have not yet reproduced the crash. I have tried modifying the reference finding process to simply link every word, via NSStringEnumerationByWords. The text view in question recognizes certain things in the entered text and adds hyperlinks to the text while the user is typing. It re-parses and re-adds the links on every key press (via overriding the didChangeText method), on a background thread. From user reports, I have learned that: The crash only occurs on macOS 14.0 and 14.1, not on previous versions The call stack always involves the spell checker, and sometimes involves adding recognized links to the text storage (the call to DispatchQueue.main.async in the code below) The crash stops happening if the user turns off the system spell checker in System Settings -> Keyboard -> Edit on an Input Source -> Correct Spelling Automatically switch The crash does not happen when there are no links in the text view. Here is the relevant code: extension NSMutableAttributedString { func batchUpdates(_ updates: () -> ()) { self.beginEditing() updates() self.endEditing() } } class MyTextView : NSTextView { func didChangeText() { super.didChangeText() findReferences() } var parseToken: CancelationToken? = nil let parseQueue = DispatchQueue(label: "com.myapp.ref_parser") private func findReferences() { guard let storage = self.textStorage else { return } self.parseToken?.requestCancel() let token = CancelationToken() self.parseToken = token let text = storage.string self.parseQueue.async { if token.cancelRequested { return } let refs = RefParser.findReferences(inText: text, cancelationToken: token) DispatchQueue.main.async { if !token.cancelRequested { storage.batchUpdates { var linkRanges: [NSRange] = [] storage.enumerateAttribute(.link, in: NSRange(location: 0, length: storage.length)) { linkValue, linkRange, stop in if let linkUrl = linkValue as? NSURL { linkRanges.append(linkRange) } } for rng in linkRanges { storage.removeAttribute(.link, range: rng) } for r in refs { storage.addAttribute(.link, value: r.url, range: r.range) } } self.verseParseToken = nil } } } } } I've filed this as FB13306015 if any engineers see this. Can anyone

This is a tricky one. I have a shipping product which, when compiled under Xcode 14.3.1 works as expected on Sonoma. If the same project is recompiled with Xcode 15, the subclass of NSTextView will not display correctly (text is same color as background). I am also using a custom NSLayoutManager (to draw invisibles). Unfortunately, there is an intermittent aspect to this. I use this subclass in several places and it works on my setup on the main editor, but not with some customers. Then I found a different use of the same subclass that does not work for me. When it does not work, it is consistent for that user. I have manually marked the textViews as using TextKit 1, with no change. I also tried the Clips Bounds to yes, again no change. If I change the class to NSTextView, the text displays properly, but I lose existing functionality. There appears to be some undocumented behavior change in Xcode 15 (or when linking against Sonoma SDK) that for subclasses of NSTextView (stored in XIB files). I know that there is a push to move toward TextKit 2, but it seems TextKit 1 support was possibly changed as well. The text is there and I can edit it, double click, copy and paste it, it is just invisible, when compiled with Xcode 15 (also 15.1). It has to be something very subtle that the subclassed TextView from one XIB will work, but from another XIB will not. Does anyone have any insight into the potential change with TextKit 1 implementation? Thanks.

This function on NSTextLayoutManager has the following signature func enumerateTextSegments( in textRange: NSTextRange, type: NSTextLayoutManager.SegmentType, options: NSTextLayoutManager.SegmentOptions = [], using block: (NSTextRange?, CGRect, CGFloat, NSTextContainer) -> Bool ) The documentation here doesn't define what the CGRect and CGFloat passed to block are. However, looking at sample code Using TextKit2 To Interact With Text, they seem to be the frame for the textsegment and baselineposition respectively. But, the textSegmentFrame seems to start at origin.x = 5.0 when text is empty. Is this some starting offset for text segments? I don't seem to be able to find mention of this anywhere.

Returning false from NSTextContentManagerDelegate.textContentManager(_:shouldEnumerate:options:) produces huge gaps in my layout instead of showing a continuous block of text. Instead of omiting the layout of the hidden element, there is a blank space that shows that appears to have the same size in layout as the omitted text element. Why is this happening and how can I prevent this? Example:

I am working on supporting some formatted text editing in my app, and I've been experimenting with copy and paste support for formatted text. I discovered that NSAttributedString implements NSItemProviderWriting, which means I can give it to UIPasteboard via setObjects and all the built-in attributes transfer perfectly if I then paste it into another text view, or even another app that behaves itself. But if I have custom attributes in my attributed string, having their values implement Codable doesn't let them transfer across the clipboard. In my implementation of textPasteConfigurationSupporting(_: transform:), I try to get an attributed string like this: let attr = item.itemProvider.loadObject(ofClass: NSAttributedString.self) { val, err in //...handle here } I get an error like this: Error Domain=NSItemProviderErrorDomain Code=-1000 "Cannot load representation of type com.apple.uikit.attributedstring" UserInfo={NSLocalizedDescription=Cannot load representation of type com.apple.uikit.attributedstring, NSUnderlyingError=0x600003e7bea0 {Error Domain=NSCocoaErrorDomain Code=260 "The file “b036c42113e34c2f9d9af14d6fefcbd534f627d6” couldn’t be opened because there is no such file." UserInfo={NSURL=file:///Users/username/Library/Developer/CoreSimulator/Devices/86E8BDD4-B6AA-4170-B0EB-57C74EC7DDF0/data/Library/Caches/com.apple.Pasteboard/eb77e5f8f043896faf63b5041f0fbd121db984dd/b036c42113e34c2f9d9af14d6fefcbd534f627d6, NSFilePath=/Users/username/Library/Developer/CoreSimulator/Devices/86E8BDD4-B6AA-4170-B0EB-57C74EC7DDF0/data/Library/Caches/com.apple.Pasteboard/eb77e5f8f043896faf63b5041f0fbd121db984dd/b036c42113e34c2f9d9af14d6fefcbd534f627d6, NSUnderlyingError=0x600003e7ac70 {Error Domain=NSPOSIXErrorDomain Code=2 "No such file or directory"}}}} But I tried making my custom attribute values implement NSSecureCoding, and then it worked. Why is Codable conformance not enough here? Is it because the code that serializes and deserializes is still in Objective-C and isn't aware of Codable? Will this change as the open-source Foundation in Swift work continues?

I have an app that uses UITextView for some text editing. I have some custom operations I can do on the text that I want to be able to undo, and I'm representing those operations in a way that plugs into NSUndoManager nicely. For example, if I have a button that appends an emoji to the text, it looks something like this: func addEmoji() { let inserting = NSAttributedString(string: "😀") self.textStorage.append(inserting) let len = inserting.length let range = NSRange(location: self.textStorage.length - len, length: len) self.undoManager?.registerUndo(withTarget: self, handler: { view in view.textStorage.deleteCharacters(in: range) } } My goal is something like this: Type some text Press the emoji button to add the emoji Trigger undo (via gesture or keyboard shortcut) and the emoji is removed Trigger undo again and the typing from step 1 is reversed If I just type and then trigger undo, the typing is reversed as you'd expect. And if I just add the emoji and trigger undo, the emoji is removed. But if I do the sequence above, step 3 works but step 4 doesn't. The emoji is removed but the typing isn't reversed. Notably, if step 3 only changes attributes of the text, like applying a strikethrough to a selection, then the full undo chain works. I can type, apply strikethrough, undo strikethrough, and undo typing. It's almost as if changing the text invalidates the undo manager's previous operations? How do I insert my own changes into UITextView's NSUndoManager without invalidating its chain of other operations?

I've been working with UITextView and TextKit 2, which became the default text engine since iOS 16, and I've encountered performance issues when handling very large text documents. Even on iPhone 14 Pro, I've noticed stuttering and frame drops when scrolling through the text view containing a large amount of text. To reproduce the issue, you can use the following code: // In iOS 16 let textView = UITextView() textView.text = "some really large string (say 1 million characters)" The scrolling performance in this scenario is not smooth. However, if you switch to TextKit 1 by accessing the layoutManager property, the performance significantly improves: // In iOS 16 let textView = UITextView() let _ = textView.layoutManager // this enables the compatibility mode textView.text = "some really large string (say 1 million characters)" With this code, scrolling remains smooth even with large text documents. It's very disappointing to see TextKit 2 performing worse than TextKit 1, even though Apple claims TextKit 2 has significantly improved performance with noncontiguous layout. Furthermore, the sample code for TextKit 2, available here, crashes when handling very large text due to excessive memory usage. Has anyone else experienced similar performance issues with TextKit 2, and are there any potential solutions or workarounds to improve the performance?

We are currently trying to adopt the newly introduced find bar in our app. The app: The app is a text editor with a main text view. However it includes nested views (for text like footnotes) that are presented as modal sheets. So you tap on the footnote within the main text, a form sheet is presented with the contents of the footnote ready to be edited. We have an existing search implementation, but are eager to move to the system-provided UI. Connecting the find bar through a custom UIFindSession with our existing implementation is working without any issues. The Problem: Searching for text does not only work in the main text view, but also nested text (like footnotes). Let's say I have a text containing the word "iPhone" both in the main text and the footnote. In our existing implementation, stepping from the search match to the next one would open the modal and highlight the match in the nested text. The keyboard would stay open. With the new UIFindInteraction this is not working however. As soon as a modal form sheet is presented, the find interaction closes. By looking at the stack trace I can see a private class called UIInputWindowController that cleans up input accessory views after the modal gets presented. I believe it is causing the find panel to give up its first responder state. I noticed that opening popovers appears to be working fine. Is there a way to alter the presentation of the nested text so that the view is either not modal or able to preserve the current find session? Or is this unsupported behavior and we should try and look for a different way? The thing that really confuses me is that this appears to work without issue in Notes.app. There the find bar is implemented as well. There are multiple views that can be presented while the find bar is open. Move Note is one of them. The view appears as a modal sheet. It keeps the find bar open and active, though its tint color matches the deactivated one of the main Notes view. The find bar is still functional with the text field being active and the overlay updating in the background. This behavior appears to be a bug in the Notes app, but is exactly what we want for our use case. I attached some images: Two are from the Notes app, two from a test project demonstrating the problem. Opening a modal view closes the find bar there.

In TextKit 1, I can override drawBackground(forGlyphRange:at:) in NSLayoutManager to do custom background drawing. However, I'm not too sure what the designated way of doing background drawing is in TextKit 2. One thing I've tried is to do custom drawing in my own CALayer that's used in the configureRenderingSurface delegate callback, but I'm unsure if we are suppose to use this API and steal the textViewportLayoutController.delegate away from _UITextLayoutcanvasView?

The way NSTextView is built it's inevitable to use NSTextStorage with TextKit2, however the NSAttributedString uses NSRange vs the TextKit2 family uses NSTextRange for text location, etc. What I struggle with is the relation between these two. I didn't find a convenient translation between these two. Is NSAttributedStrint NSRange length=1 equal to NSTextRange offset 1? I think it's not (at least it's not necessarily true for every NSTextContentManager. So my question is, given a NSTextRange, what is the corresponding NSRange in NSTextContentStorage.attributedString

I'm trying to implement custom NSTextContentManager and use it with NSTextView, however it seems that NSTextView expect NSTextContentStorage all the time. final class MyTextContentManager: NSTextContentManager { // ... } It's added to layout manager, and NSTextView instance finds it properly: let textContentManager = MyTextContentManager() textContentManager.addTextLayoutManager(textLayoutManager) however, when I use it, I see errors at: [MyTextContentManager textStorage]: unrecognized selector sent to instance 0x600003d84870 the textStorage property is part of NSTextStorageObserving, that is not NSTextContentManager interface. It looks like NSTextView is not ready to work with custom NSTextContentManager. What did I miss?