Question

I need to free the view of my mainViewController I have on a navigationViewController in order to avoid the memory-warnings that I’ve been receiving.

The good practice loading the view is in the ‘loadview’ method, but when I try to dealloc the view (when I go to the next controller of the stack) doing “self.view = nil” it calls again the ‘loadview’ method so nothing happens.

I solved this problem loading the view in the ‘viewWillAppear’ method, but, my question is:

Is that procedure correct?
If not (that’s what I think) how can I release that view to free its memory?

Which is the best (or more correct) way to do it?

This is the code:

‘loadView’ without loading the view

- (void)loadView
{
    [super loadView];
    (some more code)
}

The view it is loaded here

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];

    if (!pral)
    {
        pral = [[TouchDrawView alloc] initWithFrame:[UIScreen mainScreen].bounds];
           [self setView:pral];
           [pral release];
    }
        (some more code)
}

This is the call to the next viewController of the stack

- (void)menus:(id)sender
{
    opcions *ops = [[opcions alloc] init];
    [[self navigationController] pushViewController:ops animated:YES];
    [ops release];

//Here I'm trying to free memory releasing the view
    [pral removeFromSuperview];
    pral = nil;
    self.view = nil;
}

Thanks

Answer 1

A better hook to build custom subviews is viewDidLoad.

Minimally, you should free the retained subviews (pre-ARC) in didReceiveMemoryWarning and in dealloc.

No need to release when you push to the new viewController. Your old one is still there, underneath.