ReactiveCocoa/ReactiveCocoa — pull request #1461 by epatey (2014-08-14 15:31:01+00:00)
Title: Add [UIAlertView rac_willDismissSignal].

I needed this in my project since `rac_buttonClickedSignal` does not fire when an `UIAlertView` is dismissed programmatically via `[UIAlertView dismissWithClickedButtonIndex:animated:]`.

The same change would likely make sense for `UIActionSheet`.