[SwiftUI] MacEditorTextView - A simple and small NSTextView wrapped by SwiftUI.

MacEditorTextView.swift

/**
 *  MacEditorTextView
 *  Copyright (c) Thiago Holanda 2020-2021
 *  https://bsky.app/profile/tholanda.com
 *  
 *  (the twitter account is now deleted, please, do not try to reach me there)
 *  https://twitter.com/tholanda 
 *
 *  MIT license
 */

import Combine
import SwiftUI

struct MacEditorTextView: NSViewRepresentable {
    @Binding var text: String
    var isEditable: Bool = true
    var font: NSFont?    = .systemFont(ofSize: 14, weight: .regular)
    
    var onEditingChanged: () -> Void       = {}
    var onCommit        : () -> Void       = {}
    var onTextChange    : (String) -> Void = { _ in }
    
    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }
    
    func makeNSView(context: Context) -> CustomTextView {
        let textView = CustomTextView(
            text: text,
            isEditable: isEditable,
            font: font
        )
        textView.delegate = context.coordinator
        
        return textView
    }
    
    func updateNSView(_ view: CustomTextView, context: Context) {
        view.text = text
        view.selectedRanges = context.coordinator.selectedRanges
    }
}

// MARK: - Preview

#if DEBUG

struct MacEditorTextView_Previews: PreviewProvider {
    static var previews: some View {
        Group {
            MacEditorTextView(
                text: .constant("{ \n    planets { \n        name \n    }\n}"),
                isEditable: true,
                font: .userFixedPitchFont(ofSize: 14)
            )
            .environment(\.colorScheme, .dark)
            .previewDisplayName("Dark Mode")
            
            MacEditorTextView(
                text: .constant("{ \n    planets { \n        name \n    }\n}"),
                isEditable: false
            )
            .environment(\.colorScheme, .light)
            .previewDisplayName("Light Mode")
        }
    }
}

#endif

// MARK: - Coordinator

extension MacEditorTextView {
    
    class Coordinator: NSObject, NSTextViewDelegate {
        var parent: MacEditorTextView
        var selectedRanges: [NSValue] = []
        
        init(_ parent: MacEditorTextView) {
            self.parent = parent
        }
        
        func textDidBeginEditing(_ notification: Notification) {
            guard let textView = notification.object as? NSTextView else {
                return
            }
            
            self.parent.text = textView.string
            self.parent.onEditingChanged()
        }
        
        func textDidChange(_ notification: Notification) {
            guard let textView = notification.object as? NSTextView else {
                return
            }
            
            self.parent.text = textView.string
            self.selectedRanges = textView.selectedRanges
        }
        
        func textDidEndEditing(_ notification: Notification) {
            guard let textView = notification.object as? NSTextView else {
                return
            }
            
            self.parent.text = textView.string
            self.parent.onCommit()
        }
    }
}

// MARK: - CustomTextView

final class CustomTextView: NSView {
    private var isEditable: Bool
    private var font: NSFont?
    
    weak var delegate: NSTextViewDelegate?
    
    var text: String {
        didSet {
            textView.string = text
        }
    }
    
    var selectedRanges: [NSValue] = [] {
        didSet {
            guard selectedRanges.count > 0 else {
                return
            }
            
            textView.selectedRanges = selectedRanges
        }
    }
    
    private lazy var scrollView: NSScrollView = {
        let scrollView = NSScrollView()
        scrollView.drawsBackground = true
        scrollView.borderType = .noBorder
        scrollView.hasVerticalScroller = true
        scrollView.hasHorizontalRuler = false
        scrollView.autoresizingMask = [.width, .height]
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        
        return scrollView
    }()
    
    private lazy var textView: NSTextView = {
        let contentSize = scrollView.contentSize
        let textStorage = NSTextStorage()
        
        
        let layoutManager = NSLayoutManager()
        textStorage.addLayoutManager(layoutManager)
        
        
        let textContainer = NSTextContainer(containerSize: scrollView.frame.size)
        textContainer.widthTracksTextView = true
        textContainer.containerSize = NSSize(
            width: contentSize.width,
            height: CGFloat.greatestFiniteMagnitude
        )
        
        layoutManager.addTextContainer(textContainer)
        
        
        let textView                     = NSTextView(frame: .zero, textContainer: textContainer)
        textView.autoresizingMask        = .width
        textView.backgroundColor         = NSColor.textBackgroundColor
        textView.delegate                = self.delegate
        textView.drawsBackground         = true
        textView.font                    = self.font
        textView.isEditable              = self.isEditable
        textView.isHorizontallyResizable = false
        textView.isVerticallyResizable   = true
        textView.maxSize                 = NSSize(width: CGFloat.greatestFiniteMagnitude, height: CGFloat.greatestFiniteMagnitude)
        textView.minSize                 = NSSize(width: 0, height: contentSize.height)
        textView.textColor               = NSColor.labelColor
        textView.allowsUndo              = true
        
        return textView
    }()
    
    // MARK: - Init
    init(text: String, isEditable: Bool, font: NSFont?) {
        self.font       = font
        self.isEditable = isEditable
        self.text       = text
        
        super.init(frame: .zero)
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    // MARK: - Life cycle
    
    override func viewWillDraw() {
        super.viewWillDraw()
        
        setupScrollViewConstraints()
        setupTextView()
    }
    
    func setupScrollViewConstraints() {
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        
        addSubview(scrollView)
        
        NSLayoutConstraint.activate([
            scrollView.topAnchor.constraint(equalTo: topAnchor),
            scrollView.trailingAnchor.constraint(equalTo: trailingAnchor),
            scrollView.bottomAnchor.constraint(equalTo: bottomAnchor),
            scrollView.leadingAnchor.constraint(equalTo: leadingAnchor)
        ])
    }
    
    func setupTextView() {
        scrollView.documentView = textView
    }
}

Using ContentQueryView.swift

/**
 *  MacEditorTextView
 *  Copyright (c) Thiago Holanda 2020-2021
 *  https://bsky.app/profile/tholanda.com
 *  
 *  (the twitter account is now deleted, please, do not try to reach me there)
 *  https://twitter.com/tholanda 
 *
 *  MIT license
 */

import SwiftUI
import Combine

struct ContentQueryView: View {

    @State private var queryText = "{ \n    planets { \n        name \n    }\n}"
    @State private var responseJSONText = "{ \"name\": \"Earth\"}"
    
    var body: some View {
        let queryTextView = MacEditorTextView(
            text: $queryText,
            isEditable: false,
            font: .systemFont(ofSize: 14, weight: .regular)
        )
        .frame(minWidth: 300,
               maxWidth: .infinity,
               minHeight: 300,
               maxHeight: .infinity)
        
        let responseTextView = MacEditorTextView(
            text: $responseJSONText,
            isEditable: false,
            font: .userFixedPitchFont(ofSize: 14)
        )
        .frame(minWidth: 300,
               maxWidth: .infinity,
               minHeight: 300,
               maxHeight: .infinity)
        
        return HSplitView {
            queryTextView
            responseTextView
        }
    }
}

Hi @unnamedd , after many attempts I created it from scratch looking at WWDC2021 videos. Here's an extremely simple implementation that supports .focused in case it make it easier for you to enhance this one.

Thank you for this! I loved the simplicity of yours!
I have combined your implementation with the MacEditorTextView for the extra functions, along with a couple of other changes. One of them being the ability to add a placeholder text to the scrollview, and another being a working onSubmit function.

It is found here in case anyone can find the alterations beneficial.

@unnamedd Find bar is not working, Could you please help fixing it.
I added below line of code for NSTextView.

textView.usesFindBar = true
textView.usesFindPanel = false
textView.isIncrementalSearchingEnabled = true

This lines works when i add textview using storyboard but not working when using this for SwiftUI

Hi @RizwanaDesai,
unfortunately I don't see why it is not working for you, in any case, I am working with a friend to create a package of this humble gist in order to make it better and easier to use.

I will give a check on the problem you've reported, but you can do that too, since the code is all exposed here and there's no hidden magic being done. I would of course highly appreciate if you post here a possible solution you may find (in case you find a fix before me).

Sure @unnamedd .