How to get the actual key pressed in a UITextField

Hi all , now i develop a program on iphone SDK 3.0 GM.
I have an UITextField (created programmatically) and I have implemented the delegate as well as the UITextFieldTextDidChangeNotification so that I can react to changes in the text values.
However, I specifically want to know when the user presses the backspace key in the UITextField when there is currently no text in the field. I can't find where I can get a specific notification of the actual key pressed, as opposed to the resulting state of the text. I'm sure there is a way to do this...help?

I can imagine why you want to do it. I had the same problem myself and managed to circumvent it in a slightly painful way. What I did was to subclass UITextField to create a text field that always had text in it, even when it "seemed" empty. In fact the first character of the text is a space character, and then what follows is the actual text. In this way, your delegate will always get called about a backspace (when it's an attempt to delete the leading space character, obviously you should return NO in the textField: shouldChangeCharactersInRange: replacementString: method). I won't get into the details of exactly how to set everything up, like I said it is kind of elaborate and I wouldn't really recommend it unless you are desperate to have that kind of functionality.

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