自定义UIMenuController

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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()  }}

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