我明白了

AddViewController* firstLaunchController = [[AddViewController alloc] initWithNibName:nil bundle:nil];
UINavigationController *modalNavigationController = [[UINavigationController alloc] initWithRootViewController:firstLaunchController];
modalNavigationController.modalTransitionStyle = UIModalTransitionStyleCrossDissolve;
modalNavigationController.modalPresentationStyle = UIModalPresentationFormSheet;
[detailViewController presentModalViewController:modalNavigationController animated:YES];
[firstLaunchController release];

非常简单

谢谢大家