Get started with Writing Tools

func textViewWritingToolsWillBegin(_ textView: UITextView) {
    // Take necessary steps to prepare. For example, disable iCloud sync.
}

func textViewWritingToolsDidEnd(_ textView: UITextView) {
    // Take necessary steps to recover. For example, reenable iCloud sync.
}

if !textView.isWritingToolsActive {
    // Do work that needs to be avoided when Writing Tools is interacting with text view
    // For example, in the textViewDidChange callback, app may want to avoid certain things
       when Writing Tools is active
}

textView.writingToolsBehavior = .limited

textView.writingToolsBehavior = .none

textView.writingToolsAllowedInputOptions = [.plainText]

textView.writingToolsAllowedInputOptions = [.plainText, .richText, .table]

// For `WKWebView`, the `default` behavior is equivalent to `.limited`

extension WKWebViewConfiguration {
    @available(iOS 18.0, *)
    open var writingToolsBehavior: UIWritingToolsBehavior { get set }
}

extension WKWebViewConfiguration {
    @available(macOS 15.0, *)
    open var writingToolsBehavior: NSWritingToolsBehavior { get set }
}

extension WKWebView {
    /// @discussion If the Writing Tools behavior on the configuration is `.limited`, this will always be `false`.
    @available(iOS 18.0, macOS 15.0, *)
    open var isWritingToolsActive: Bool { get }
}

// Returned `NSRange`s are relative to the substring of the textView’s textStorage from `enclosingRange`
func textView(_ textView: UITextView, writingToolsIgnoredRangesIn
        enclosingRange: NSRange) -> [NSRange] {
    let text = textView.textStorage.attributedSubstring(from: enclosingRange)
    return rangesInappropriateForWritingTools(in: text)
}

protocol UITextInput {
    @available(iOS 18.0, macOS 15.0, *)
    optional var isEditable: Bool { get }
}

class CustomTextView: NSView, NSServicesMenuRequestor {
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        
        self.menu = NSMenu()
        self.menu?.addItem(NSMenuItem(title: "Custom Text View", action: nil,
            keyEquivalent: ""))
        self.menu?.addItem(NSMenuItem(title: "Copy", action: #selector(copy(_:)), 
            keyEquivalent: ""))
    }
  
    override func draw(_ dirtyRect: NSRect) {
        super.draw(dirtyRect)
        
        // Custom text drawing code...
    }
}

class CustomTextView: NSView, NSServicesMenuRequestor {
    override func validRequestor(forSendType sendType: NSPasteboard.PasteboardType?, 
                                 returnType: NSPasteboard.PasteboardType?) -> Any? {
        if sendType == .string || sendType == .rtf {
            return self
        }
        return super.validRequestor(forSendType: sendType, returnType: returnType)
    }
    
    nonisolated func writeSelection(to pboard: NSPasteboard,
                                    types: [NSPasteboard.PasteboardType]) -> Bool {
        // Write plain text and/or rich text to pasteboard
        return true
    }

    // Implement readSelection(from pboard: NSPasteboard)
       as well for editable view
}