Swift Access Controls: How To Avoid The ‘Private’ Keyword Repetition

A few weeks ago, I contributed an article about Swift functions in objc.io, where I mentioned that I prefer to put all my private methods together at the bottom of my class, separated by a landmark. So I wish there was a way in Swift, like in other languages, to say that all functions below this one are private.

In response, @chromophoreapp had the following idea:

I tried this out today, and really like the result!

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {


// MARK: Private
private extension ViewController {
    func configureAppearance() {
        view.backgroundColor = UIColor.purpleColor()

This approach really reduces the noise in your ViewController, and has the added benefit of not having to write the private keyword over and over again for your private methods.

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