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))
}

Amazing!!.. I am done.

This returned me 11 even for couple of words.

This returned me 11 even for couple of words.

Please check the width of UILable. Let fix it. I have also been like you.

Thank you very much! You helped a lot) It works)

Code updated to Swift 5 and made as UILabel extension. Also 0 will be returned if the label doesn't have any text.

extension UILabel {
  func countLines() -> Int {
    guard let myText = self.text as NSString? else {
      return 0
    }
    // Call self.layoutIfNeeded() if your view uses auto layout
    let rect = CGSize(width: self.bounds.width, height: CGFloat.greatestFiniteMagnitude)
    let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedString.Key.font: self.font as Any], context: nil)
    return Int(ceil(CGFloat(labelSize.height) / self.font.lineHeight))
  }
}

Now you can perform something like:

class MyAwesomeViewController: UIViewController {
  @IBOutlet weak var myAwesomeLabel: UILabel!

  override func viewDidLoad() {
    if myAwesomeLabel.countLines() >= 2 {
      // Do some stuff
    }
  }
}

I have 2 lines UILabels but still this extension shows me 1 line

I have 3 lines UILabels but still this extension shows me 1 line