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I know memory management in iOS is tricky subject to newbies like me, but I was hoping for a clear explanation here on stackoverflow which I could not find anywhere else.
So, pretend I have a property / ivar
@property(nonatomic, retain) UIPopoverController *popOver;
which I'm allocating like this:
self.popOver = [[[UIPopoverController alloc] initWithContentViewController:popOverContent] autorelease];
Now, in my dealloc and viewDidUnload methods, I do both
// in viewDidUnload:
self.popOver = nil;
// in dealloc:
[popOver release];
Question:
Thanks in advance for your time - I'll continue reading, seriously memory management can't be that hard to wrap your head around...
860
Filters. (computing) Automatic release (of previously allocated resources)
Realloc() If you need to reallocate a memory block, you can use the realloc() function… void* realloc (void* ptr, size_t size);
-dealloc is an Objective-C selector that is sent by the Objective-C runtime to an object when the object is no longer owned by any part of the application. -release is the selector you send to an object to indicate that you are relinquishing ownership of that object.
Objective-C provides two methods of application memory management. In the method described in this guide, referred to as “manual retain-release” or MRR, you explicitly manage memory by keeping track of objects you own.
Don't be confused by the autorelease in this line:
self.popOver = [[[UIPopoverController alloc] initWithContentViewController:popOverContent] autorelease];
After this statement you effectively own the object because the property setter claimed ownership of it. The autorelease balances the alloc-init.
So... yes, you need to autorelease at allocation. If you did this (no autorelease), you would leak:
self.popOver = [[UIPopoverController alloc] initWithContentViewController:popOverContent];
Another option is to use a temporary variable instead of autorelease:
UIPopoverController *temp = [[UIPopoverController alloc] initWithContentViewController:popOverContent];
self.popOver = temp;
[temp release];
Either way you need to release the object in dealloc.
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