本文共 1544 字，大约阅读时间需要 5 分钟。

1.注册/移除通知

override func viewDidLoad() {        super.viewDidLoad()        NotificationCenter.default.addObserver(self, selector: #selector(keyBoardWillShow(_:)), name: NSNotification.Name.UIKeyboardWillShow, object: nil)        NotificationCenter.default.addObserver(self, selector: #selector(keyBoardWillHide(_:)), name: NSNotification.Name.UIKeyboardWillHide, object: nil)    } deinit {  //移除通知  NotificationCenter.default.removeObserver(self)    } 
 
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2.实现通知中的方法

//键盘的出现    func keyBoardWillShow(_ notification: Notification){        //获取userInfo        let kbInfo = notification.userInfo        //获取键盘的size        let kbRect = (kbInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue        //键盘的y偏移量        let changeY = kbRect.origin.y - SCREEN_HEIGHT        //键盘弹出的时间        let duration = kbInfo?[UIKeyboardAnimationDurationUserInfoKey] as! Double       //界面偏移动画        UIView.animate(withDuration: duration) {            self.aTableView.transform = CGAffineTransform(translationX: 0, y: changeY)        }    }    //键盘的隐藏    func keyBoardWillHide(_ notification: Notification){        let kbInfo = notification.userInfo        let kbRect = (kbInfo?[UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue        let changeY = kbRect.origin.y        let duration = kbInfo?[UIKeyboardAnimationDurationUserInfoKey] as! Double        UIView.animate(withDuration: duration) {           self.tableViewConstraint.update(inset: 0)        }    }

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