In my app users register or login at a site that requires passwords at least 6 characters long. To work with that I'd like to impose that minimum in the password UITextField before the keyboard return button is enabled. Setting Auto-enable Return Key in the XIB causes the return key to be disabled until there is at least one character & (contrary to my expectations) turning that off causes the return key to be anabled even with no text.

Can anyone tell me how I can keep the return key disabled until the user has input 6 characters?