presentModalViewController无法全屏显示

- (void) presentModalViewController:(UIViewController *)screen animated:(BOOL)animated {
    UIResponder *responder = self;
    while (responder && ![responder isKindOfClass:[HomeViewController class]]) {
        responder = [responder nextResponder];
    }
    [(UIViewController *)responder presentModalViewController:screen animated:YES];
}

subview

presentModelViewController

LearnITViewController *tempView = [[LearnITViewController alloc] initWithNibName:@\"LearnITViewController\" bundle:[NSBundle mainBundle]];
self.learnITViewController = tempView;
[tempView release];
[self.view addSubview:mainMenuView.view]; 

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation 
{
// Return YES for supported orientations.
return (interfaceOrientation == UIInterfaceOrientationLandscapeRight);//or left
}

LearnITViewController *learnit = [[LearnITViewController alloc] initWithNibName:@\"LearnITViewController\" bundle:nil];
self.learnitView = learnit;
[self.learnitView setsetWantsFullScreenLayout:YES];

self.learnitView.wantsFullScreenLayout = YES;
[self presentModalViewController:learnit animated:YES];    
[learnit release];

self

superview

UIViewController

LearnITViewController *learnit = [[LearnITViewController alloc] initWithNibName:@\"LearnITViewController\" bundle:nil];
self.learnitView = learnit;
[self.view.superview presentModalViewController:learnit animated:YES];    
[learnit release];