How to organize a swift file

DetailViewController.swift

// From Jared Sinclair's blog: http://blog.jaredsinclair.com/post/152672541355/how-i-organize-a-swift-file

import UIKit
import CoreData

class DetailViewController: UIViewController {

    // MARK: Internal Properties

    weak var delegate: DetailViewControllerDelegate?

    // MARK: UIViewController Properties

    override var preferredFocusEnvironments: [UIFocusEnvironment] { }

    // MARK: IBOutlets

    @IBOutlet private weak var textView: UITextView!
    @IBOutlet private weak var resetButton: UIButton!

    // MARK: Private Properties

    private var item: Item!
    private var persistentContainer: NSPersistentContainer!
    private var networkClient: NetworkClient!

    // MARK: Init / Deinit

    static func make(item: Item, persistentContainer: NSPersistentContainer, networkClient: NetworkClient) -> DetailViewController { }

    // MARK: Public Methods

    func refreshItem() { }

    // MARK: UIViewController Methods

    override func viewDidLoad() { }

    override func traitCollectionDidChange(_ previousTraitCollection: UITraitCollection?) { }

    // MARK: IBActions

    @IBAction private func resetButtonTapped(_ sender: UIButton) { }

    // MARK: Private Methods

    private func resetText() { }
}