NSNumberFormatter problems in user interface

Hi guys.
I have number formatters applied to some text fields in my user interface. They work fine generally. The only problem is, if I put in a number, then move onto the next field, and then go back and get rid of that number, the text field requires I enter a '0' instead of being able to leave it blank.
Does anyone know of a way to get a number formatter to accept a blank?
FYI - I am setting these number formatters up in Interface Builder, and have no minimum value set.
I'd appreciate any help you could offer.
Thanks,
Ricky.

You can try overriding UITextFieldDelegate
– textField:shouldChangeCharactersInRange:replacementString:
Check if the replacement string is a space. If so, accept it and if not call super. You will need to implement this in the class that you use as the text field delegate.

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