CodedView.swift

extension UIView {
    static func withoutConstraints() -> Self {
        let instance = self.init()
        instance.translatesAutoresizingMaskIntoConstraints = false
        return instance
    }

    func addSubviews(_ views: UIView...) {
        for view in views {
            addSubview(view)
        }
    }
}

protocol CodedView {
    func setupViews()
    func setupLayout()
}

extension CodedView where Self: UIView {
    func setup() {
        setupViews()
        setupLayout()
    }
}

// convenience 'abstract' class to reduce boilerplate in custom view classes
// similar can be done for UITableView, UICollectionView, etc
class CodedUIView: UIView, CodedView {
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) not supported")
    }

    func setupViews() {}
    func setupLayout() {}
}

class SomeView: CodedUIView {
    private let labelView = UILabel.withoutConstraints()
    private let imageView = UIImageView.withoutConstraints()

    override func setupViews() {
        addSubviews(labelView, imageView)
        setupLabel()
        setupImage()
    }

    private func setupLabel() {
        labelView.text = "Some text"
        // ...
    }


    private func setupImage() {
        imageView.image = UIImage()
        // ...
    }

    override func setupLayout() {
        labelView.trailingAnchor.constraint(equalTo: imageView.leadingAnchor, constant: 10).isActive = true
        //...
    }
}