用通知监听键盘的出现与消失，与获取键盘高度

  // let keyBoardView = UIView()

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//      let center = NotificationCenter.default

//      center.addObserver(self, selector: #selector(willShow(notic:)), name: NSNotification.Name.UIKeyboardWillShow, object: nibName)

//      center.addObserver(self, selector: #selector(willHide(notice:)), name: NSNotification.Name.UIKeyboardWillHide, object: nibName)

//      center.addObserver(gardenInfoExpandView(), selector: #selector(gardenInfoExpandView.clickRightBtn), name: NSNotification.Name.UIKeyboardWillHide, object: nibName)

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//   func willShow(notic: NSNotification){

//      if let ty = (notic.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue.height,

//         let animDur = notic.userInfo?[UIKeyboardAnimationDurationUserInfoKey] as? Double {

//         UIView.animate(withDuration: animDur, animations: { () -> Void in

//         self.keyBoardView.frame = CGRectMake(0, screenHeight() - 30 - ty, screenWidth(), 30)

//         self.keyBoardView.backgroundColor = UIColor(hex: "dededc")

//         

//         self.btn.frame = CGRectMake(screenWidth() - 90, screenHeight() - 30 - ty, 90, 30)

//         self.btn.setTitle("完成", for: .normal)

//         self.view.addSubview(self.keyBoardView)

//         self.view.addSubview(self.btn)

//         self.btn.addTarget(self, action: #selector(self.willHide), for: .touchUpInside)

//         })

//      }

//   }

//   func willHide(notice:NSNotification){

//      dismissKeyboard()

//      keyBoardView.removeFromSuperview()

//      btn.removeFromSuperview()

//   }