iPhone - Memory Management - Am I creating and releasing this variable correctly?

Question

Ok heres the situation. I have a View controller class that serves as the main view(MainView). It contains a subview that another view controller takes care of(ChangingView). Now, every four seconds, ChangingView needs to change its view. What I am currently doing goes something like this.

ChangingView = [[AnotherView alloc] initWithNibName:@"AnotherView" bundle:[NSBundle mainBundle]];
[MainView addSubview:ChangingView.view]; 

Now, after the 4 seconds is up and before the lines up there are called I do the following.

[ChangingView release];
[ChangingView.view removeFromSuperview];

What is happening is I am getting memory warnings like mad. And eventually it gives me the debug messages of "program sent '0'" or "data formatters currently unavailable". Both of which I believe mean I am out of memory. I don't think that should be happening as the amount of stuff in the views isn't multiple MB so for some reason it has to be stacking or something. If you need any clarification please ask and any help will be greatly appreciated as I am currently stumped. Thanks in advance.

Answer 1

(I had originally said no, but I missed the fact the release happened later and he was saving the view controller reference).

If you are seeing memory use climb, be sure the views you are adding as subviews are really released... this is also a time when it would be a good idea to use Instruments to try and follow what was being allocated and deallocated.

Answer 2

Something irks me about these two lines of code:

[ChangingView release];
[ChangingView.view removeFromSuperview];

I think that the very fact that you can actually access ChangingView.view after you've released without getting an EXC_BAD_ACCESS error means that you're not correctly releasing ChangingView everywhere (which, by the way, you should probably call ChangingView*Controller* so as not to confuse people whether it's a subclass of UIView or UIViewController).

Check whether ChangingView's dealloc method is actually ever called. Ever. There's not enough information or code to tell you where you're forgetting to release it, but I'm betting that's where the problem is at.