getting height constraint

UIView+Constraints.swift

extension UIView {

 var heightWithConstraint: CGFloat {
        get {
            for constraint in constraints where constraint.firstAttribute == .height {
                return constraint.constant
            }
            return 0
        }
        set (newHeight){
            for constraint in constraints where constraint.firstAttribute == .height {
                constraint.constant = newHeight
            }
        }
    }
}