Why is Instruments marking memory leaks on UIColor and NSArray?

Question

Hello,

I couldn't realize why this code is being marked as having memory leaks:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {    

    MenuViewController *menuView = [[MenuViewController alloc] initWithNibName:@"MenuView" bundle:[NSBundle mainBundle]];
    navigationController = [[UINavigationController alloc] initWithRootViewController:menuView];
    navigationController.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"livreto-verso-horizontal.png"]]; // memory leak here 47,1%
    [menuView release];
    BilheteViewController *rightView = [[BilheteViewController alloc] initWithNibName:@"BilheteView" bundle: [NSBundle mainBundle]];
    spliViewController.viewControllers = [NSArray arrayWithObjects:navigationController, rightView, nil]; // memory leak here 52,9%
    [window addSubview:spliViewController.view];

    [window makeKeyAndVisible];

    [rightView release];

    return YES;
}

Just the lines marked with problems:

navigationController.view.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"livreto-verso-horizontal.png"]]

and

spliViewController.viewControllers = [NSArray arrayWithObjects:navigationController, rightView, nil];

How do I solve this leaks?

Update 1

App Delegate's dealloc method, both navigationController and spliViewController are being released:

- (void)dealloc {
    [navigationController release];
    [spliViewController release];
    [window release];
    [super dealloc];
}

Answer 1

Is it possible the only references to the objects you're seeing leaking are in other objects which are also leaking?

For example, you allocate a navigation controller here:

navigationController = [[UINavigationController alloc] initWithRootViewController:menuView];

The UIColor will be retained by that navigationController when you assign it to backgroundColor.

Are you releasing the reference to that navigationController somewhere?

Answer 2

The leaks tool shows you where something that is leaking, was allocated.

So what it's saying is, after you assigned these values they were never released - which seems like it means your navigation controller is not being released when it should be.