Question

I have a situation to navigate from first tab item to second tab item by a button click in first tab. how can i do that ?

Answer 1

You can call -setSelectedIndex: in your button click handler.
This would select the 3rd tab.

[tabBarController setSelectedIndex: 2];

Please note that documentation is your friend: UITabBarController Class Reference

In addition you can try this:

[tabBarController setSelectedViewController:(UIViewController *)[tabBarController.viewControllers objectAtIndex: 2]];