How to customize UIAlertView? Will Apple approve it?

Question

I am using a custom UIAlertView with UITextField to get password from the user.

I have been told that this custom view may cause my App to get

Answer 1

Quoting from the class reference

The UIAlertView class is intended to be used as-is and does not support subclassing. The view hierarchy for this class is private and must not be modified.

The last sentence appears to me that they don't want developers modifying the views.

Answer 2

iOS 5 now supports this natively. Check out UIAlertView's alertViewStyle property.