Calculate preferred height of UIView

UIView.swift

extension UIView {
  func calculatePreferredHeight(preferredWidth: CGFloat? = nil) -> CGFloat {
    let width = preferredWidth ?? frame.width
    let widthConstraint = NSLayoutConstraint.constraintsWithVisualFormat("H:[view(==\(width)@999)]", options: .allZeros, metrics: nil, views: ["view": self])
    addConstraints(contraint)
    let height = systemLayoutSizeFittingSize(UILayoutFittingCompressedSize).height
    removeConstraints(constraint)
    return height
  }
}

Thank you!

Thanks, here is an updated version:

func calculatePreferredHeight(preferredWidth: CGFloat) -> CGFloat {
        let widthConstraint = NSLayoutConstraint(
            item: self,
            attribute: .width,
            relatedBy: .equal,
            toItem: nil,
            attribute: .notAnAttribute,
            multiplier: 1,
            constant: preferredWidth
        )
        addConstraint(widthConstraint)
        let height = systemLayoutSizeFitting(UIView.layoutFittingCompressedSize).height
        removeConstraint(widthConstraint)
        return height
}