func heightOfString(_ string: String, attributes: [NSAttributedString.Key: Any], fitting width: CGFloat) -> CGFloat {

    let constraintRect = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)
    let boundingRect = string.boundingRect(with: constraintRect,
                                           options: [.usesLineFragmentOrigin, .usesFontLeading],
                                           attributes: attributes,
                                           context: nil)

    return boundingRect.size.height
}

func heightOfAttributedString(_ attributedString: NSAttributedString, fitting width: CGFloat) -> CGFloat {

    let constraintRect = CGSize(width: width, height: CGFloat.greatestFiniteMagnitude)
    let boundingRect = attributedString.boundingRect(with: constraintRect,
                                           options: [.usesLineFragmentOrigin, .usesFontLeading],
                                           context: nil)

    return boundingRect.size.height
}