一对帮助你的链接 -

http://code.tutsplus.com/tutorials/ios-sdk-working-with -uialertview-and-uialertviewdelegate - mobile-3159 [ ^ ]

https://developer.apple.com/library/ios/documentation/uikit/reference/UIAlertView_Class/UIAlertView/UIAlertView.html [ ^ ]

Couple of links to help you -
http://code.tutsplus.com/tutorials/ios-sdk-working-with-uialertview-and-uialertviewdelegate--mobile-3159[^]
https://developer.apple.com/library/ios/documentation/uikit/reference/UIAlertView_Class/UIAlertView/UIAlertView.html[^]