iOS Swift: How to check if UILabel is truncated? Calculate number of lines for UILabel

UILabelCountLines.swift

func countLabelLines(label: UILabel) -> Int {
    // Call self.layoutIfNeeded() if your view uses auto layout
    let myText = label.text! as NSString

    let rect = CGSize(width: label.bounds.width, height: CGFloat.greatestFiniteMagnitude)
    let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: label.font], context: nil)

    return Int(ceil(CGFloat(labelSize.height) / label.font.lineHeight))
}

In order to work you must call it after func viewDidLayoutSubviews() was called.
It uses the label frame. In viewDidLoad this value is still not correct which leads to you getting incorrect values.