NSTextView wrapper for SwiftUI

RichTextEditor.swift

import Combine
import SwiftUI

struct RichTextEditor: NSViewRepresentable {

    @Binding var attributedText: NSAttributedString
    @Binding var showInspector: Bool

    var activity: PassthroughSubject<Date, Never>

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeNSView(context: Context) -> NSScrollView {
        let scrollview = NSTextView.scrollableTextView()
        let textview = scrollview.documentView as! NSTextView
        textview.delegate = context.coordinator
        textview.isEditable = true
        textview.isRichText = true
        textview.allowsUndo = true
        textview.isFieldEditor = false
        textview.usesAdaptiveColorMappingForDarkAppearance = true
        textview.drawsBackground = false // true
        textview.usesRuler = false
        textview.usesFindBar = true
        textview.isIncrementalSearchingEnabled = true
        textview.isAutomaticQuoteSubstitutionEnabled = true
        textview.isAutomaticDashSubstitutionEnabled = true
        textview.usesInspectorBar = showInspector
        textview.usesFontPanel = true
        textview.importsGraphics = true
        textview.allowsImageEditing = true
        textview.isAutomaticSpellingCorrectionEnabled = true
        textview.isAutomaticDataDetectionEnabled = true
        textview.isAutomaticLinkDetectionEnabled = true
        textview.displaysLinkToolTips = true
        textview.backgroundColor = NSColor.textBackgroundColor
        textview.textContainerInset = NSSize(width: 10, height: 10)
        textview.isContinuousSpellCheckingEnabled = true
        textview.setSelectedRange(NSMakeRange(0, 0))
        return scrollview
    }

    func updateNSView(_ nsView: NSScrollView, context: Context) {
        let textview = nsView.documentView as! NSTextView

        if textview.usesInspectorBar != showInspector {
            textview.usesInspectorBar = showInspector
        }

        guard textview.attributedString() != attributedText else {
            return
        }

        guard let storage = textview.textStorage else {
            print("WARNING: Text storage is missing.")
            return
        }

        storage.setAttributedString(attributedText)
    }

    class Coordinator: NSObject, NSTextViewDelegate {
        var parent: RichTextEditor
        var affectedCharRange: NSRange?

        init(_ parent: RichTextEditor) {
            self.parent = parent
        }

        func textDidChange(_ notification: Notification) {
            guard let textview = notification.object as? NSTextView else {
                return
            }

            self.parent.activity.send(Date.now)
            self.parent.attributedText = textview.attributedString()
        }

        func textView(_ textView: NSTextView, shouldChangeTextIn affectedCharRange: NSRange, replacementString: String?) -> Bool {
            return true
        }
    }
}