Refresh tableView \ View

I have tab bar application and when i press on one of the tabs the开发者_如何学C ViewDidLoad called now if i moving to another tab and then return to the previous one the VewDidLoad didnt call how can i know that this window load again?

and also how can i refresh a view? for example a viewtable that i made logic changes and want to refresh the new data.

thanks.

The viewDidLoad method will just called once. The method you want is viewWillAppear, you can override that one.

To refresh a tableview you could use [tableview reloadData]