setting Title for navigation bar in xcode

I have created a navigation controller programmatically,

        //Creating AddViewController Object
         addViewController *addView = [[addViewController alloc]init];
         UINavigationController *addViewControl = [[UINavigationController alloc]init];
 
         [addViewControl.view addSubview:addView.view];
 
         [self presentModalViewController:addViewControl animated:YES];
 

But when i add self.title = @"Title" in addViewController class. it is not displaying.

i tried with the following,

self.navigationItem.title = @"Title";
 
 self.navigationController.navigationBar.topItem.title = @"Title";
 

But it's not displaying Title.

I think it is possible to do with setting a label. but the above one is direct method.

Any Idea..

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