ios 监控键盘状态

增加键盘显示和隐藏事件监听

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NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(notification:)), name: UIResponder.keyboardWillShowNotification, object: nil)           NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(notification:)), name: UIResponder.keyboardWillHideNotification, object: nil)

 

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@objc func keyboardWillShow(notification:Notification){         let userinfo:Dictionary = notification.userInfo!         let frame = (userinfo[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue         UIView.animate(withDuration: 0.4, animations: {             self.view.frame.origin.y = 0 - frame.height         })     }           @objc func keyboardWillHide(notification:Notification){         UIView.animate(withDuration: 0.4, animations: {             self.view.frame.origin.y = 0         })     }

　　删除事件监听

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1 2	NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)         NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)