About UIAlertView with Textfield…

If you want to add a TextField to an UIAlertView, you can use this property (alertViewStyle) for UIAlertView:

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Title"
                                                message:@"Message"
                                               delegate:self
                                      cancelButtonTitle:@"Done"
                                      otherButtonTitles:nil];
alert.alertViewStyle = UIAlertViewStylePlainTextInput;
[alert show];
[alert release];

and in .h file of it add UIAlertViewDelegate as a protocol and implement the alertView:clickedButtonAtIndex delegate method in the .m file:

-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex{
    NSLog(@"%@", [alertView textFieldAtIndex:0].text);
}

I hope, it works for you!

Note: “Available in iOS 5.0 and later”