iOS Keyboard doesn't show up in iOS 15.4

Question

I'm new to iOS. I've just taken over for another developer. I recently realised that this is a major issue because users cannot use our app. The keyboard gets dismissed as soon as it's shown. So no one can enter anything in the text field/s. It's happening only on iOS 15.4 and 15.4.1

This is the code that moves the entire view frame up/down when the keyboard is shown/dismissed (Apart from registering the observers and stuff). This is currently used in the app for around 2 years now.

override func viewWillAppear(_ animated: Bool) {
  registerForKeyboardNotifications()
}

func registerForKeyboardNotifications() {
  // UIResponser.keyboardWillShowNotification is supplemented 
  // with UIResponser.keyboardDidShowNotification only in the second gif image below
  NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow(_:)), name: UIResponder.keyboardWillShowNotification, object: nil)
        
  NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillHide(_:)), name: UIResponder.keyboardWillHideNotification, object: nil)
        
}


@objc func keyboardWillShow(_ sender: Foundation.Notification) {
        
  let info = sender.userInfo!
        
  let keyboardFrame: CGRect = (info[UIResponder.keyboardFrameEndUserInfoKey] as! NSValue).cgRectValue
        
    UIView.animate(withDuration: 0.1, animations: { () -> Void in    
      if self.view.frame.origin.y == self.currentOrigin {
        self.view.frame.origin.y -= keyboardFrame.size.height
      }
    })
        
}
    
@objc func keyboardWillHide(_ sender: Foundation.Notification) {
        
  UIView.animate(withDuration: 0.1, animations: { () -> Void in
      self.view.frame.origin.y = self.currentOrigin
  })
        
}

override func viewWillDisappear(_ animated: Bool) {
  deregisterFromKeyboardNotifications()
}

func deregisterFromKeyboardNotifications(){
        
  NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillShowNotification, object: nil)
        
  NotificationCenter.default.removeObserver(self, name: UIResponder.keyboardWillHideNotification, object: nil)
        
}

Is there any other way to handle this for iOS 15.4? The above code is mostly what I find online but it doesn't seem to be an option.

iOS 15.4 with the above code

iOS 15.4 with the above code but the keyboardWillShow function above being triggered by the keyboardDidShow observer instead

iOS 15.4 with the above code commented out (Basically not moving the view/s up/down when detecting keyboard show/hide)

iOS 15.2 (and all lower versions) with the above code working perfectly as intended

Answer 1

Try to add constraints like this

contentView.bottomAnchor.constraint(equalTo: view.keyboardLayoutGuide.topAnchor)

or check this link

also video tutorial here