Button disappears after animating it - ios

Question

I'm using UIView Extension for button to slide it up with keyboard.
extension UIView {
func bindToKeyboard() {
NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange(_:)), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
}
#objc func keyboardWillChange(_ notification: NSNotification) {
let duration = notification.userInfo![UIKeyboardAnimationDurationUserInfoKey] as! Double
let curve = notification.userInfo![UIKeyboardAnimationCurveUserInfoKey] as! UInt
let startingFrame = (notification.userInfo![UIKeyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
let endingFrame = (notification.userInfo![UIKeyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
let deltaY = endingFrame.origin.y - startingFrame.origin.y
let options = UIViewAnimationOptions(rawValue: curve << 16)
UIView.animate(withDuration: duration, delay: 0, options: options, animations: {
self.frame.origin.y += deltaY
self.layoutIfNeeded()
}, completion: nil)
}
}
Then in ViewController just using :
func setUpView() {
okayButton.bindToKeyboard()
self.isHeroEnabled = true
}
But the problem is when I press other button on the screen:
Save button disappears after tapping on other button, when it is in the "upper position", and appears when it's on the bottom. What am I doing wrong? How to prevent/fix it?
Edit: There is no action on any of these buttons! (+,-,save)
Thanks!

Answer 1

You don't necessarily need to update self.view . What you can do is create a IBOutlet bottom spacing for the save button.
#IBOutlet weak var saveButtonBottomSpacing: NSLayoutConstraint!
When keyboard is open, set bottom spacing constant to keyboard's height.
When keyboard is dismissed, restore the bottom spacing. May be 0 or your desired value.
You can make this changes within UIView animation block.

Answer 2

Hide (resign) your keyboard upon successful action on 'Save' button.
Here is sample code you need to update in your Save button action.
#IBAction func btnSave(sender: Any){
// add this line in your upon, successful action on save button
yourTextView.resignFirstResponder()
}