Help Adding an Activity Indicator on a tab bar application!

please need help. have tab bar app, , need put activity indicator. doesn't work through actual view controller. little background info, have 5 view controller, each corresponding tab in tab bar. have uiwebviews , want activity indicator displayed while load. but, nothing tried works. think should put code in app delegate, code used didn't work, hope can me, or give me code app delegate activity indicator.
in advance!

 

are talking activity indicator @ top system battery/time? or centered on current view controller?

if former:

code:

  [uiapplication sharedapplication].networkactivityindicatorvisible = yes;  

if later, have more work do...

 

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