UiTextfield does not move up when Keyboard pops up ios 11 (Working on Previous versions)

Question

PROBLEM : not working in ios 11 (However working in ios 8)

The following code is written in Swift 2.0. But my application is too large to migrate the code at one go and to release an update.

Aim : I want to give a release with xcode 7 but i get a 'developer disk image' when debugging on ios 11. So how can i fix the bug without migrating the code

func viewDidLoad(){

    super.baseScrolllView = scrollView
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardAdjust:"), name:UIKeyboardWillShowNotification, object: nil);
    NSNotificationCenter.defaultCenter().addObserver(self, selector: Selector("keyboardAdjust:"), name:UIKeyboardWillHideNotification, object: nil);
}

Code in Base class

var keyboardIsVisible = false
var baseScrolllView: UIScrollView!
func keyboardAdjust(notification: NSNotification) {

    let info = notification.userInfo!
    let keyboardHeight:CGFloat = (info[UIKeyboardFrameEndUserInfoKey] as! NSValue).CGRectValue().size.height
    let duration:Double = info[UIKeyboardAnimationDurationUserInfoKey] as! Double

    var userInfo = notification.userInfo!
    var keyboardFrame:CGRect = (userInfo[UIKeyboardFrameBeginUserInfoKey] as! NSValue).CGRectValue()
    keyboardFrame = self.view.convertRect(keyboardFrame, fromView: nil)

    if notification.name == UIKeyboardWillShowNotification && keyboardIsVisible == false{

        keyboardIsVisible = true

        UIView.animateWithDuration(duration, animations: { ()

            var contentInset:UIEdgeInsets = self.baseScrolllView.contentInset
            contentInset.bottom = keyboardFrame.size.height
            self.baseScrolllView.contentInset = contentInset



        })


    }else {
        keyboardIsVisible = false

        UIView.animateWithDuration(duration, animations: { ()
            var contentInset:UIEdgeInsets = UIEdgeInsetsZero
            self.baseScrolllView.contentInset = contentInset
        })
    }

}

Answer 1

This is how I get the height of keyboard

@objc func keyboardWillShow(_ notification: Notification) {
    guard let userInfo = notification.userInfo, 
          let keyboardSize = (userInfo[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue, 
          let duration = userInfo[UIKeyboardAnimationDurationUserInfoKey] as? Double else { return }

    containerViewBottomConstraint.constant = keyboardSize.height
    UIView.animate(withDuration: duration) { 
        self.containerView.layoutIfNeeded()
    }
}