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