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AlertController - Sample code for UIAlertController

Version 1.1   26 April 2015       Use target-action for text field changes
Version 1.0   05 September 2014   Initial version.
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Example code covering the use of UIAlertController to create alert and
action sheet views. The UIAlertController class was introduced in iOS 8
as a replacement for UIAlertView and UIActionSheet. Full details in the
following post:

http://useyourloaf.com/blog/2014/09/05/uialertcontroller-changes-in-ios-8.html