iphone - How to dismiss UIActionSheet or UIAlertView after the UIViewController popped -

in situation, when uialertview or uiactionsheet showing, due external event, supposed pop view controller, when both alert view or action sheet showing on view not destroying. showing alerts view in many places don't want make member variable , dismiss checking 1 one.

how handle case? idea appreciated.

thanx.

for alertview can use below answer

https://stackoverflow.com/a/16915501/1713478

and actionsheet use below code

[actionsheet dismisswithclickedbuttonindex:0 animated:yes];