Keyboard (numpad) toolbar working but not showing - ios

Question

I tried to add a toolbar for my UITextFiled, the keyboard is set to numpad. It is working but the button is not showing. I created an extension for my UITextfield
extension UITextField {
/// Adding a done button on the keyboard
func addDoneButtonOnKeyboard() {
let doneToolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
doneToolbar.barStyle = .default
let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let done = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(self.doneButtonAction))
let items = [flexSpace, done]
doneToolbar.items = items
doneToolbar.sizeToFit()
self.inputAccessoryView = doneToolbar
}
/// Done button callback
#objc func doneButtonAction() {
self.resignFirstResponder()
}
}
and then I am calling this extension like this
private lazy var fromInputField: CoinpassInput = {
let input = CoinpassInput()
input.keyboardType = .decimalPad
input.addTarget(self, action: #selector(fromInputFieldDidChange), for: .editingChanged)
input.addDoneButtonOnKeyboard()
return input
}()
the toolbar is showing and working but the 'done; button is not showing. If I click on the right corner of the toolbar. the keyboard will hide. I dont know what I am missing why the button is not showing.

Answer 1

Try this code, with slight modifications:
func addDoneButtonOnKeyboard() {
let doneToolbar = UIToolbar(frame: CGRect(x: 0, y: 0, width: UIScreen.main.bounds.width, height: 50))
doneToolbar.barStyle = .default
doneToolbar.barTintColor = .red
let flexSpace = UIBarButtonItem(barButtonSystemItem: .flexibleSpace, target: nil, action: nil)
let done = UIBarButtonItem(title: "Done", style: .done, target: self, action: #selector(self.doneButtonAction))
done.tintColor = .yellow
doneToolbar.setItems([flexSpace,done], animated: false)
doneToolbar.isUserInteractionEnabled = true
self.inputAccessoryView = doneToolbar
}