为什么我在底部视图和键盘之间获得额外空间而键盘快速向上移动

如何解决为什么我在底部视图和键盘之间获得额外空间而键盘快速向上移动

对于我已经给出的底视图

 bottom = leading  = trialing = 0,height = 100

并且我已经给了底部视图 NSLayoutConstraint 以在键盘出现时向上移动

 @IBOutlet weak var viewbottomConstraint: NSLayoutConstraint!

代码：

super.viewDidLoad()
    messageTextfield.delegate = self
    NotificationCenter.default.addobserver(self,selector: #selector(handleKeyboardNotification),name: UIResponder.keyboardWillShowNotification,object: nil)
    
    NotificationCenter.default.addobserver(self,name: UIResponder.keyboardWillHideNotification,object: nil)
 
}

    @objc func handleKeyboardNotification(_ notification: Notification) {

    if let userInfo = notification.userInfo {
        
        let keyboardFrame = (userInfo[UIResponder.keyboardFrameEndUserInfoKey] as AnyObject).cgRectValue
        
        let isKeyboardShowing = notification.name == UIResponder.keyboardWillShowNotification
        viewbottomConstraint?.constant = isKeyboardShowing ? keyboardFrame!.height : 0

        UIView.animate(withDuration: 0.5,animations: { () -> Void in
            self.view.layoutIfNeeded()

        })
    }
}

override func viewWilldisappear(_ animated: Bool) {
    NotificationCenter.default.removeObserver(self)
}
override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    self.bottomContainerView.superview?.setNeedsLayout()
}

然后 o/p 如下所示：gap b/w keyboard and bottomview

OP img