On Jun 4, 2010, at 13:03, Brad Stone wrote:
> How do I create the callback method? I don't understand what the signature
> is telling me. I have
> canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo: in my
> NSDocument and I want to set up the callback method. When I create a method
> as below it never fires. I must just not be reading it correctly.
>
> - (void)document:(NSDocument *)doc shouldClose:(BOOL)shouldClose
> contextInfo:(void *)contextInfo {
> NSLog(@"hey, it finally worked!");
> }
>
> What exactly should the method be in my NSDocument?
It's a bit confusing, because your 'canCloseDocumentWithDelegate...' is an
override. That means a delegate selector is being passed *in* to this method,
and it's not your selector. There's no direct way to substitute your
'document:shouldClose:...' method for the supplied one.
But there is a solution. Look in the Leopard AppKit Developer Release Note:
http://developer.apple.com/mac/library/releasenotes/Cocoa/AppKitOlderNotes.html
in the section with the following title:
Advice for Overriders of Methods that Follow the
delegate:didSomethingSelector:contextInfo: Pattern
This explains what you need to do to get your method to be called.
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