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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?
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.