Observe Text changes in UILabel in Swift

MyLabel.swift

class MyLabel: UILabel {
    var textWillChange:((_ oldText: String?)->())? = nil
    var textDidChange:((_ newText: String?)->())? = nil
    override var text: String? {
        willSet {
            if textWillChange != nil {
                textWillChange!(self.text)
            }
        }
        didSet {
            if textDidChange != nil {
                textDidChange!(self.text)
            }
        }
    }
}

ViewController.swift

override func viewDidLoad() {
super.viewDidLoad()
    //Usage:
    let label = MyLabel()
    label.textDidChange = { (text) in
        print("New Text: \(String(describing: text))")
    }
    label.textWillChange = { (text) in
        print("Old Text: \(String(describing: text))")
    }
}

Thanks for the tip !