CopyableLabel - a typical UILabel with "Copy" functionality.

CopyableLabel.swift

import UIKit

class CopyableLabel: UILabel {
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        userInteractionEnabled = true
        addGestureRecognizer(UILongPressGestureRecognizer(target: self, action: #selector(CopyableLabel.showMenu(_:))))
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    func showMenu(sender: AnyObject?) {
        becomeFirstResponder()
        let menuController = UIMenuController.sharedMenuController()
        if !menuController.menuVisible {
            menuController.setTargetRect(bounds, inView: self)
            menuController.setMenuVisible(true, animated: true)
        }
    }
    
    override func copy(sender: AnyObject?) {
        let pasteBoard = UIPasteboard.generalPasteboard()
        pasteBoard.string = text
        let menuController = UIMenuController.sharedMenuController()
        menuController.setMenuVisible(false, animated: true)
    }
    
    override func canBecomeFirstResponder() -> Bool {
        return true
    }
    
    override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
        return action == #selector(NSObject.copy(_:))
    }
}