If you’re using UISplitViewController in your iPad/Universal apps, you probably implemented the UISplitViewControllerDelegate to add a UIBarButtonItem to the detail view controller’s toolbar to display a popover. The popover might have some extra space before the first row after you rotate the simulator or the iPad from landscape to portrait, took me a few hours to figure this out, it is because the navigation bar’s translucent property is set to YES, set it to NO before you add the button and you won’t see the extra space. Also, if you instantiate the nav bar in your NIB, leave its style asdefault in Interface Builder, otherwise the popover will be messed up on load when you launch the app in portrait orientation. Set them in code instead.

- (void)viewWillAppear:(BOOL)animated {
	[super viewWillAppear:animated];
	
	self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
	self.navigationController.navigationBar.translucent = YES;
}

#pragma mark -
#pragma mark UISplitViewControllerDelegate methods

- (void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc {
	self.navigationController.navigationBar.translucent = NO; //if I don't do this we get extra space in popover
	barButtonItem.title = @"Some Title";
	
	// Keep references to the popover controller and the popover button, and tell the detail view controller to show the button.
	self.popoverController = pc;
	self.rootPopoverButtonItem = barButtonItem;
	UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
	[detailViewController showRootPopoverButtonItem:rootPopoverButtonItem];
}

- (void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem {
	//setting it back to black translucent
	self.navigationController.navigationBar.barStyle = UIBarStyleBlack;
	self.navigationController.navigationBar.translucent = YES;
	
	// Nil out references to the popover controller and the popover button, and tell the detail view controller to hide the button.
	UIViewController <SubstitutableDetailViewController> *detailViewController = [splitViewController.viewControllers objectAtIndex:1];
	[detailViewController invalidateRootPopoverButtonItem:rootPopoverButtonItem];
	self.popoverController = nil;
	self.rootPopoverButtonItem = nil;
}