How to check if UILabel is truncated?

**Swift 3**

You can count the number of lines after assigning the string and compare to the max number of lines of the label.

import Foundation
import UIKit

extension UILabel {

func countLabelLines() -> Int {
// Call self.layoutIfNeeded() if your view is uses auto layout
let myText = self.text! as NSString
let attributes = [NSFontAttributeName : self.font]

let labelSize = myText.boundingRect(with: CGSize(width: self.bounds.width, height: CGFloat.greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: attributes, context: nil)
return Int(ceil(CGFloat(labelSize.height) / self.font.lineHeight))
}

func isTruncated() -> Bool {
guard numberOfLines > 0 else { return false }
return countLabelLines() > numberOfLines
}
}