tabbar problem!

I have two pages tabbar things webview, when I want to switch to reload it, ask how to write? The method in which the switch trigger to write in?
Each time you switch tabbar to reload the current page.
Thank you!
Reply:
tabBarController: didSelectViewController:
Reply:
Oh, I was in the page using - (void) viewWillAppear: (BOOL) animated method completed.
You say that I try!