Text Kit 1 fallback

[emphimy]

Hi,

I am encountering a warning when navigating to a view that uses RichTextKit. Could you clarify if this is an internal issue with the library or something related to my code?

UITextView 0x11ab07000 is switching to TextKit 1 compatibility mode because its layoutManager was accessed. Break on void _UITextViewEnablingCompatibilityMode(UITextView *__strong, BOOL) to debug.

I am trying to generate content dynamically into the editor, but the editor always appears blank and fails to render the streaming data.

`
private var editor: some View {
RichTextEditor(
text: $rtContext.text,
context: rtContext.context
) { editor in
if let textView = editor as? UITextView {
logger.debug("Starting UITextView configuration")

            textView.isEditable = true
            textView.backgroundColor = .clear
            
            textView.textContainerInset = .init(top: 10, left: 10, bottom: 10, right: 10)
            textView.textContainer.lineFragmentPadding = 0
            
            if #available(iOS 16.0, *) {
                textView.textLayoutManager?.delegate = nil
            }
            
            let attributes: [NSAttributedString.Key: Any]
            if rtContext.text.length > 0 {
                attributes = rtContext.text.attributes(
                    at: 0,
                    effectiveRange: nil
                )
            } else {
                let paragraphStyle = NSMutableParagraphStyle()
                paragraphStyle.lineSpacing = 8
                attributes = [
                    .font: UIFont.preferredFont(forTextStyle: .body),
                    .foregroundColor: UIColor.label,
                    .paragraphStyle: paragraphStyle
                ]
            }
            
            textView.typingAttributes = attributes
            
            logger.debug("""
                UITextView configuration completed:
                - Text length: \(rtContext.text.length)
                - Is editable: \(textView.isEditable)
                - Attributes: \(attributes)
                """)
        }
    }
    .onAppear {
        logger.debug("RichTextEditor appeared")
    }
}

// MARK: - Body
var body: some View {
    NavigationStack {
        VStack(spacing: 0) {
            if !isFocusMode {
                toolbar
            }

            ZStack {
                VStack(spacing: 0) {
                    editor
                    .onAppear {
                        logger.debug("RichTextEditor appeared with text length: \(rtContext.text.length)")
                    }
                    .padding()
                    
                    // Add formatting toolbar at bottom
                    RichTextKeyboardToolbar(
                        context: rtContext.context,
                        leadingButtons: { _ in EmptyView() },
                        trailingButtons: { _ in EmptyView() }, 
                        formatSheet: { $0 }
                    )
                }
            }
        } `

Current streaming implementation

`.task {
guard let stream = generationStream else { return }
await MainActor.run {
isGenerating = true
let initialAttributes: [NSAttributedString.Key: Any] = [
.font: UIFont.preferredFont(forTextStyle: .body),
.foregroundColor: UIColor.label,
.paragraphStyle: {
let style = NSMutableParagraphStyle()
style.lineSpacing = 8
return style
}()
]
let initialString = NSAttributedString(string: "", attributes: initialAttributes)
rtContext.text = initialString
}

do {
    for try await text in stream {
        await MainActor.run {
            let currentAttributes = rtContext.context.attributedString.attributes(
                at: max(0, rtContext.context.attributedString.length - 1),
                effectiveRange: nil
            )
            
            let newRange = NSRange(location: rtContext.text.length, length: 0)
            let attributedString = NSAttributedString(string: text, attributes: currentAttributes)
            
            rtContext.updateAttributedText(in: newRange, with: attributedString)
        }
    }
} catch {
    // Error handling
}

}`

[danielsaidi]

Hi @emphimy

RTK is using the layout manager, but I haven't seen this warning before. Perhaps it's something new in iOS 18?