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长按复制，粘贴，这个大多数情况会在文本控件中起作用，我们也可以通过UIMenuController 自定义一些需要的操作，这里，介绍一种通用的方法，添加自定义的“举报”行为。

//长按举报
class ReportLabel: UILabel {

  override init(frame: CGRect) {
    super.init(frame: frame)

    let longPress = UILongPressGestureRecognizer(target: self, action: #selector(ReportLabel.showMenu(_:)))
    self.addGestureRecognizer(longPress)
  }

  required init?(coder aDecoder: NSCoder) {
    fatalError("init(coder:) has not been implemented")
  }

  //需要重写以下两个方法
  override func canBecomeFirstResponder() -> Bool {
    return true
  }

  override func canPerformAction(action: Selector, withSender sender: AnyObject?) -> Bool {
    if action == #selector(CommentCell.report(_:)) {
      return true
    }
    return false
  }

  //实现举报的方法
  func report (sender: UIMenuController) {
  }

  //自定义UIMenuController
  func showMenu(gestureRecognizer: UILongPressGestureRecognizer) {
    self.becomeFirstResponder()

    let touchPoint = gestureRecognizer.locationInView(self)
    let touchArea = CGRect(origin: touchPoint, size: CGSize.zero)

    let reportMenuItem = UIMenuItem(title: "举报", action: #selector(ReportLabel.report(_:)))
    let customMenuController = UIMenuController.sharedMenuController()
    customMenuController.menuItems = [reportMenuItem]
    customMenuController.arrowDirection = .Default
    customMenuController.setMenuVisible(true, animated: true)
    customMenuController.setTargetRect(touchArea, inView: gestureRecognizer.view!)
    customMenuController.update()
  }
}