iOS adjusting bottom constraint constant of view when keyboard visible has a larger offset on newer model iPhones

Question

I am setting up my keyboard will show notifier, getting the keyboard height, and setting the constant value on the bottom constraint as shown here:

Notification Observer

NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillShow), name: UIResponder.keyboardWillShowNotification, object: nil)

Keyboard Will Show Function

@objc func keyboardWillShow(notification: NSNotification) {
    guard let keyboardFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
        return
    }

    _keyboardHeight = keyboardFrame.cgRectValue.height
    changeStateContainerBottomConstraint.constant = _keyboardHeight
}

However on newer models of phones the value I am getting back is placing the view higher than the top of the keyboard as shown in the screenshots below. I am hesitant to adjust the constraint with a static value as that could change in the future, or from model to model. Has anyone else come across this issue and have a solution?

iPhone SE Screenshot

iPhone 14 Pro Screenshot

Answer 1

It looks like I've found a workable solution. Just needed to find the bottom value of the safe area insets and subtract it from the returned height. Here is what keyboardWillShow looks like now

 @objc func keyboardWillShow(notification: NSNotification) {
    guard let keyboardFrame = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? NSValue else {
        return
    }

    _keyboardHeight = keyboardFrame.cgRectValue.height
    let bottom: CGFloat = UIApplication.shared.delegate?.window??.safeAreaInsets.bottom ?? 0
    changeStateContainerBottomConstraint.constant = _keyboardHeight - bottom
}

Answer 2

I would suggest you look at this framework https://github.com/hackiftekhar/IQKeyboardManager which is the most popular library to handle this kind of stuff. It's easier to use with a few lines of code like IQKeyboardManager.shared.enable = true in your AppDelegate file.