[iPhone] Force a view to pop to its root when a UITabBarController button is pressed

force-pop-to-root-tabbarcontroller-on-change.c

// This function will force a view to pop to its root when a UITabBarController button is pressed

- (void)tabBarController:(UITabBarController *)tabBarController 
 didSelectViewController:(UIViewController *)viewController {
	
	// self is Application Delegate
	[[self navigationController] popToRootViewControllerAnimated:NO];
	if ([viewController isKindOfClass:[UINavigationController class]]) {
		[(UINavigationController *)viewController popToRootViewControllerAnimated:NO];
	}
}