UIAlertViewDelegate clickedButtonAtIndex: usefulness?

Question

The UIAlertViewDelegate protocol defines two methods, alertView:clickedButtonAtIndex: and alertView:didDismissWithButtonIndex:, which seem to me to be identical in usefulness.

Why is there a clickedButtonAtIndex and a didDismissButtonWithIndex when they both do the same thing? I realize there is also a willDismissButtonWithIndex that happens before the alert view is dismissed, but is there any reason to use clickedButtonAtIndex instead of didDismissButtonWithIndex?

Answer 1

I found a more useful difference between the two:

When showing a UIAlertView, and the device goes to sleep, alertView:didDismissWithButtonAtIndex: gets called, even though the alert view is not actually dismissed. It is shown again once the device wakes up. alertView:clickedButtonAtIndex: is only called when the user clicks one of the buttons.