self.navigationController.tabBarController.selectedIndex not working

Question

I have a UITabBarController which containing 4 different UIViewControllers.

On first tab there is a UINavigationViewController

Answer 1

we should put follow section in viewDidAppear.

    - (void)viewDidAppear:(BOOL)animated
{
NSArray *ary = [self.tabBarController viewControllers];
    UIViewController *vc = ary[3];
    [self.tabBarController setSelectedIndex:3];
    [self.tabBarController setSelectedViewController:vc];
}