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.

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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]