How to add image in UINavigationBar in IPhone app

One way to do this is to use UINavigationItem.titleView and UINavigationItem.rightBarButtonItem. Like this :

viewController.navigationItem.titleView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage.png"]];
UIBarButtonItem * item = [[UIBarButtonItem alloc] initWithCustomView:[[UIImageView alloc] initWithImage:[UIImage imageNamed:@"yourimage2.jpg"]]];    
viewController.navigationItem.rightBarButtonItem = item;    

Here I am using UIImageView as custom view, but it can be UIButton with custom image.