Programmatically switch UItabbarcontroller index & customize

[erritikamathur]

From a button inside first viewcontroller of UItabbarcontroller, I want to switch tabbar controller index programatically to a second tab index.i have used following code ot do this

self.tabBarController.selectedViewController = [self.tabBarController.viewControllers objectAtIndex:1];

I also want to change the text of UILabel, which is within xib of second viewcontroller. How can I do that?

When I access the selectedViewController's IBOutlet there are all null.