Question

I have some memory issue with my iPhone application and I have no clue what is happening.

So, I observed that the memory usage of the application is rising continuously when going from an UIViewController to another. I have used the “Mark Heap” tool from the “Allocations” instrument and it seams that the only objects that are not deallocated are my UIViewControllers.

To be more specific I have let take my two UIViewControllers. The first one is named PuzzleViewController and the second one is named Options. When the app starts, the PuzzleViewController appears. I mark a heap here, to set a baseline, and after this I press the “Options” button which will present the Options UIViewController. I go back to the first one and I mark a heap again. After repeating these steps over and over again (like 20 times or so :D) I observe that after every Heapshot I have about 22 objects remaining alive. Two of those objects are instances of my UIViewControllers.

I really don’t have any clue what is happening.

Here is how I switch to the Options UIViewController:

- (IBAction) onOptionsButton: (id) sender
{
    Options *viewController = [[Options alloc] init];
    [self presentModalViewController:viewController animated:YES];
    [viewController release];
}

And here is how I go back to the PuzzleViewController:

- (IBAction) onMainMenu:(id) sender
{   
    PuzzleViewController *modalView = [[PuzzleViewController alloc] init];
    [self presentModalViewController:modalView animated:YES];
    [modalView release];
}

My viewDidUnload functions are called properly, but no dealloc function is ever called.

Thank you,
Andrei

Answer 1

You should call dismissModalViewController, not presentModalViewController again, nor recreate your PuzzleViewController.