- (void)viewDidLoad

{

[super viewDidLoad];
self.view.backgroundColor=[UIColor grayColor];
self.navigationController.navigationItem.title=@"A";
self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(back1)];
}
-(void)back1{
B *b=[[B alloc]init];
b.view.backgroundColor=[UIColor redColor];
UINavigationController *navi=[[UINavigationController alloc]initWithRootViewController:b];
navi.viewControllers=[NSArray arrayWithObjects:b, nil];
[b release];
navi.modalTransitionStyle=UIModalTransitionStyleFlipHorizontal;
[self presentModalViewController:navi animated:YES];
[navi release];
}

 

 

 

- (void)viewDidLoad

{
[super viewDidLoad];
// Do any additional setup after loading the view.
self.navigationController.navigationItem.title=@"B";
self.navigationItem.leftBarButtonItem=[[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAction target:self action:@selector(back)];
}
-(void)back{
[self dismissModalViewControllerAnimated:YES];
}