.swift

extension UIView {

func addToParent(view :UIView) -> UIView {
        view.addSubview(self)
        return self
}
    
func bottomMargin(from view: UIView, margin :CGFloat) -> UIView {
    
    self.bottomAnchor.constraint(equalTo: view.bottomAnchor, constant: margin).isActive = true
    return self
}

func centerX(in view: UIView) -> UIView {
    self.centerXAnchor.constraint(equalTo: view.centerXAnchor).isActive = true
    return self
}

func setWidth(width :CGFloat) -> UIView {
    
    self.widthAnchor.constraint(equalToConstant: width).isActive = true
    return self
}

func setHeight(height : CGFloat) -> UIView {
    self.heightAnchor.constraint(equalToConstant: height).isActive = true
    return self
}

}