Hi Laurent, Thanks for the hint. Searched and found some docs that say the same thing. http://developer.apple.com/mac/library/documentation/Cocoa/Conceptual/Garbag... Dave. On 29 Apr 2010, at 23:08, Laurent Sansonetti wrote:

Hi Dave,

Normally, you would do this in -finalize, since -dealloc will not be called under GC.

Now, I believe (this should be confirmed...) that under GC, NSNotificationCenter & friends automatically unregister observers when they get collected. This is done through the weak reference machinery. It may not be implemented for all observer pattern-based APIs though, so in some cases doing it manually in -finalize might be required...

One critical thing to keep in mind while writing a -finalize method is to avoid resurrection. The GC does not support that. Make sure you do not insert "self" anywhere it could be "referenced" by a write barrier.

HTH, Laurent

On Apr 29, 2010, at 11:33 AM, Dave Baldwin wrote:

...

A common design pattern in cocoa seems to be to have a objc method along the lines:

- (void)dealloc {

// Stop observing the tool palette. [[NSNotificationCenter defaultCenter] removeObserver:self name:SKTSelectedToolDidChangeNotification object:[SKTToolPaletteController sharedToolPaletteController]];

// Stop observing the document's canvas size. [[self document] removeObserver:self forKeyPath:SKTDocumentCanvasSizeKey];

// memory management stuff removed... }

- taken from the Sketch sample.

One way to handle this would be to add a finalizer method to act in place of the the dealloc, but is this the best or correct way to handle this?

Thanks,

Dave.

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