I have recently converted from Storyboard to XIB. Because I have a large number of views, and it is easier to work with XIBs over a git repository. (Also the app will now be available for iOS 4).
Now here is the code that I used to have, but I am wondering how I would achieve the same without Storyboard, but with XIBs:
UIStoryboard *storyboard = [UIStoryboard storyboardWithName:@"MainStoryboard" bundle:[NSBundle bundleForClass:[self class]]];
infoView *infoViewController = [storyboard instantiateViewControllerWithIdentifier:[defaults objectForKey:@"launchScreen"]];
infoViewController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
[self presentViewController:infoViewController animated:YES completion:nil];