iOS swift 5: Swift UIView畫面觸發 OnClick事件

 當點選畫面上任何位置(不包含其他物件的地方),
 就會觸發 checkAction()

 解決方案來源:
  UIView touch event in controller

  myView 指的是 
  @IBOutlet var myView: UIView

let gesture = UITapGestureRecognizer(target: self, action:  #selector(self.checkAction))
self.myView.addGestureRecognizer(gesture)

@objc func checkAction(sender : UITapGestureRecognizer) {
    // Do what you want
}