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Question on cocoa style: value for (id)sender parameter

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Question on cocoa style: value for (id)sender parameter

Subject: Question on cocoa style: value for (id)sender parameter
From: Matt Gillette <email@hidden>
Date: Mon, 24 Jan 2005 12:24:48 -0800

Hi,

I have a question about the difference between these two lines (I've seen both styles in tutorials):

[aSheet orderOut:NULL];
[aSheet orderOut:self];

Is there any advantage to null/nil versus self? What is the sender variable used for? I'm not just asking about orderOut, but all cocoa interface methods that take an (id)sender and seem to do nothing with it.

Thanks,
Matt

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