I've seen a lot of answers out on SO detailing how to accept user input on an UIAlertView, but I was wondering if doing so violates Apple's iOS Human Interface Guidelines.
According to the section on Alerts,
Avoid creating unnecessary alerts... [alerts] are usually unnecessary if they... [a]sk for confirmation of user-initiated actions. To get confirmation for an action the user initiated, even a potentially risky action such as deleting a contact, you should use an action sheet.
However, I wish to use a Alert view to prompt the user to input a password, much like Apple does when a user purchases an app from App Store.
I'd appreciate any input!
As Apple does this in many locations, I don't think it violates the HIG. I can also say this with confidence because of something I learned at WWDC. I would advise you to look on the Apple Developer site under the prerelease documentation for iOS 5 on UIAlertView (unfortunately I can't say more on here since it is under NDA).