The only solution i found using UIAlertView with more than one text field in iOS7 is for login only.
use this line to initialize your alertView
[alert setAlertViewStyle:UIAlertViewStyleLoginAndPasswordInput];
and this to grab the users input:
user = [alert textFieldAtIndex:0].text;
pw = [alert textFieldAtIndex:1].text
For other purposes than login view the other threads like this on: UIAlertView addSubview in iOS7
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