Keyboard Show and Hide.swift

@objc func keyboardWillShow(_ notification: Notification) {
        
    if let keyboardFrame = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        keyboardHeight = keyboardRectangle.height
    }
        
    if view.frame.origin.y == 0 {
        let animationDuration = notification.userInfo?[UIKeyboardAnimationDurationUserInfoKey]
            
        UIView.animate(withDuration: animationDuration as! TimeInterval) {
            self.view.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: (self.view.window?.frame.height)! - self.keyboardHeight)
            self.view.layoutIfNeeded()
        }
    }
}
    
@objc func keyboardWillHide(_ notification: Notification) {
        
    UIView.animate(withDuration: 0.2) {
        self.view.frame = CGRect(x: 0, y: 0, width: self.view.frame.width, height: UIScreen.main.bounds.height)
        self.view.layoutIfNeeded()
    }
}