StackOverflow2013

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primarykey
Id
8779397
data
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2012-01-08T17:02:28.113
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2012-01-08T17:02:28.113
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Score
7
ViewCount
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LastEditorDisplayName
text
Body
You can pass any object as the <code>object</code> of a notification, but the convention is that the <code>object</code> is the "thing that is doing the notifying" (and you put other relevant state in the <code>userInfo</code> dictionary). The reason why it's mostly <code>self</code> is because usually the object doing the notifying usually wants to reference itself. That way, for example, if you had many <code>Foo</code> objects, and one of them completed a task and sent a notification, anyone observing the notification could just look at <code>object</code> to see which <code>Foo</code> was the one in question. The observer can also choose to observe only notifications from a particular <code>Foo</code> when you follow this scheme. It's also reasonable (though less common) to use something besides "self" when posting a notification-- let's say you're sending a notification "on behalf of" another object. For example, you could be a singleton controller object that completes a <code>Bar</code> task, and you could send the notification with a reference to the particular <code>Bar</code> as the object. That makes more sense than using the singleton as the <code>object</code>, since there'd be no interesting variance there. Again, this is a (useful) convention only. When you make up your own notification, you get to define the "contract" of the notification, which is the name, what kind of object is used as the <code>object</code>, and what's in the <code>userInfo</code>.
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1. PONSNotification: does the object property have to be self?
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1. USBen Zotto
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