How to find out what UITextField caused a UIKeyboardWillShowNotification?

Question

I am trying to use a customized keyboard in my application, but I am hitting problems when trying to restrict it to one particular UITextField.

I based my code on this X

Answer 1

I have achieved this before by comparing the object with the UI object that I am interested in. Like this:

if(notification.object == exampleViewController.textField)
{
  ...
}