Creating a new XIB for the iPad and adding UISplitViewControllers to each tab was too much for my lazy bones, so I decided to do it programmatically at runtime, in my app delegate. Here's what the code looks like:
// Masterful retrofit hack: Wrap the view controllers inside split view controllers if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) { NSMutableArray *controllers = [NSMutableArray arrayWithCapacity:[tabBarController.viewControllers count]]; for (UIViewController *controller in tabBarController.viewControllers) { UISplitViewController *split = [[[UISplitViewController alloc] init] autorelease]; split.tabBarItem = controller.tabBarItem; DetailViewController *detail = [[[DetailViewController alloc] init] autorelease]; // a detail view will come here UINavigationController *nav = [[[UINavigationController alloc] initWithRootViewController:detail] autorelease]; split.viewControllers = [NSArray arrayWithObjects:controller, nav, nil]; [controllers addObject:split]; } tabBarController.viewControllers = controllers; }The code is iterating over the tab bar's controllers and inserting a split view into the mix.
At the other point in our code (where we would normally push views onto the navigation controllers), we detect the presence of a split view and do the appropriate thing:
if ([self.navigationController.parentViewController isKindOfClass:[UISplitViewController class]]) { // iPad split view controller support UISplitViewController *split = (UISplitViewController *)self.navigationController.parentViewController; UINavigationController *nav = [split.viewControllers objectAtIndex:1]; DetailViewController *detail = [nav.viewControllers objectAtIndex:0]; [detail initWithModel:phoneBookModel entryAtIndex:indexPath.row]; } else { UIViewController *controller = [[DetailViewController alloc] initWithModel:phoneBookModel entryAtIndex:indexPath.row]; [self.navigationController pushViewController:controller animated:YES]; [controller release]; }