Getting UILabel Height by giving String, UIFont and Number of lines - swift

Question

I have found several good answers about how to calculate the height of UILabel with a given text and the UIFont:
extension String {
func heightWithConstrainedWidth(width: CGFloat, font: UIFont) -> CGFloat {
let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
let boundingBox = self.boundingRect(with: constraintRect, options: [.usesLineFragmentOrigin, .usesFontLeading], attributes: [NSAttributedStringKey.font: font], context: nil)
return boundingBox.height
}
}
However, I want to go a little bit further and calculate the height with a given text, font and number of lines. Is that even possible? So, if the height is supposed to be in 2 lines, I would like the height for 2 lines.
Thank you.

Answer 1

In Swift 5:
Rob pointed me in the right direction and I saw that the number of lines can be achieved by using the UIFont.lineHeight.
Solution for getting the right height with a given text, width and max number of lines.
func height(width: CGFloat, font: UIFont, maxLines: CGFloat = 0) -> CGFloat {
//Calculating height
let constraintRect = CGSize(width: width, height: .greatestFiniteMagnitude)
let boundingBox = self.boundingRect(with: constraintRect,
options: [.usesLineFragmentOrigin, .usesFontLeading],
attributes: [NSAttributedStringKey.font: font], context: nil)
let height = ceil(boundingBox.height)
if maxLines > 0 {
let lines = height / font.lineHeight
if lines >= maxLines {
return (boundingBox.height / lines) * maxLines
}
}
return height
}