BlogPostUtils.swift

protocol HasModel {
    associatedtype Model
    var model: Model? { get set }
}

protocol HasHeight {
    static var height: CGFloat { get }
}

extension UIView {
    
    func enableConstraints() -> Self {
        return self <== {
            $0.translatesAutoresizingMaskIntoConstraints = false
        }
    }
    
    func layout(center child: UIView) -> UIView {
        child.enableConstraints()
        addSubview(child)
        NSLayoutConstraint.activate([
            centerXAnchor.constraint(equalTo: child.centerXAnchor),
            centerYAnchor.constraint(equalTo: child.centerYAnchor)
        ])
        return self
    }
    
    func layout(width: CGFloat, height: CGFloat) -> UIView {
        enableConstraints()
        NSLayoutConstraint.activate([
            widthAnchor.constraint(equalToConstant: width),
            heightAnchor.constraint(equalToConstant: height)
        ])
    }
}