Uilabel height using boundigRect - ios

Question

Hi everyone I have created a view that shows an error message. Within this view I have inserted a UILabel that shows the message. So far so good, the height of the UILabel changes based on the length of the text using text.boundingRect
My problem is that the text is shown correctly only if it does not exceed a certain number of lines, in case the text is too long it is cut and I don't understand why
In short, if the text is not very long I have no display problems otherwise if the text is very long it is cut
this is what i am using to get the height of the text.
Where am I wrong?
private func estimateTextHeight()-> CGFloat {
let text = (toastView.textLbl.text ?? "") as NSString
let attribute: [NSAttributedString.Key: Any] = [.font: toastView.textLbl.font!]
return text.boundingRect(with: .init(width: 300, height: 2000), options: .usesLineFragmentOrigin, attributes: attribute, context: nil).height
}
private func updateToast(icon: UIImage?) -> Void {
let height = estimateTextHeight()
toastView.heightAnchor.constraint(equalToConstant: height).isActive = true
}

Answer 1

To calculate label height try this:
extension String {
func height(withConstrainedWidth width: CGFloat, font: UIFont) -> CGFloat {
let constraintRect = CGSize(width: width,
height: .greatestFiniteMagnitude)
let boundingBox = self.boundingRect(with: constraintRect,
options: .usesLineFragmentOrigin,
attributes: [.font: font],
context: nil)
return ceil(boundingBox.height)
}
}