https://stackoverflow.com/q/78519341/1271826

TableViewDemo.swift

import Foundation

class ViewController: NSViewController {
    private let scrollView = NSScrollView()
    private let tableView = NSTableView()
    private let arrayController = NSArrayController()
    private var observers: [NSKeyValueObservation] = []

    // Your data source array
    @objc dynamic var people: [Person] = [
        Person(name: "John", age: 25),
        Person(name: "Jane", age: 30),
        Person(name: "Alice", age: 28)
    ]

    override func viewDidLoad() {
        super.viewDidLoad()

        configure()
    }
}

private extension ViewController {
    func configure() {
        configureTableView()
        configureScrollView()
        addObservers()
    }

    func configureTableView() {
        tableView.translatesAutoresizingMaskIntoConstraints = false

        let nameColumn = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("NameColumn"))
        nameColumn.title = "Name"
        tableView.addTableColumn(nameColumn)

        let ageColumn = NSTableColumn(identifier: NSUserInterfaceItemIdentifier("AgeColumn"))
        ageColumn.title = "Age"
        tableView.addTableColumn(ageColumn)

        // Create and configure the NSArrayController
        arrayController.bind(.contentArray, to: self, withKeyPath: "people", options: nil)

        // Bind the table view to the array controller
        tableView.bind(.content, to: arrayController, withKeyPath: "arrangedObjects", options: nil)
        tableView.bind(.selectionIndexes, to: arrayController, withKeyPath: "selectionIndexes", options: nil)
        tableView.bind(.sortDescriptors, to: arrayController, withKeyPath: "sortDescriptors", options: nil)

        // Bind columns to the array controller
        nameColumn.bind(.value, to: arrayController, withKeyPath: "arrangedObjects.name", options: nil)
        ageColumn.bind(.value, to: arrayController, withKeyPath: "arrangedObjects.age", options: nil)
    }

    func configureScrollView() {
        scrollView.translatesAutoresizingMaskIntoConstraints = false
        view.addSubview(scrollView)
        // Set up constraints to ensure the table view fills the parent view
        NSLayoutConstraint.activate([
            scrollView.leadingAnchor.constraint(equalTo: view.leadingAnchor),
            scrollView.trailingAnchor.constraint(equalTo: view.trailingAnchor),
            scrollView.topAnchor.constraint(equalTo: view.topAnchor),
            scrollView.bottomAnchor.constraint(equalTo: view.bottomAnchor),
        ])

        scrollView.documentView = tableView
        scrollView.hasVerticalScroller = true
    }
    
    // for demonstration purposes, I'm just going to observe name changes

    func addObservers() {
        for person in people {
            let observer = person.observe(\.name, options: [.old, .new]) { [weak self] _, change in
                guard let self else { return }
                print(people)
            }
            observers.append(observer)
        }
    }
}

class Person: NSObject {
    @objc dynamic var name: String
    @objc dynamic var age: Int

    init(name: String, age: Int) {
        self.name = name
        self.age = age
    }
}

extension Person {
    override var description: String { "\(name) is \(age) years old" }
}