Re: applicationWillTerminate: issue
Re: applicationWillTerminate: issue
- Subject: Re: applicationWillTerminate: issue
- From: Jason Foreman <email@hidden>
- Date: Tue, 25 Aug 2009 10:46:43 -0500
On Aug 24, 2009, at 10:26 PM, Michael de Haan wrote:
-applicationWillTerminate: doesn't magically get called.
NSApplication posts this notification to the default notification
center. NSApplication also automatically signs its delegate up for
this notification.
Kyle, from the "Cocoa Fundamentals Guide": "Although you can
dynamically change the delegate, only one object can be a delegate
at a time. Thus if you want multiple objects to be informed of a
particular program event at the same time, you cannot use delegation."
So, if I understand you and the documentation correctly , even
though I had implemented the delegate of NSApplication in **both**
of my classes, **only** one of those classes will respond to
"applicationWillTerminate:" at a time. If this is indeed correct,
then I need to rethink the design of my application, and you have
already suggested how to do this.
True, only one object can be the application delegate at any one
time. However, multiple objects can be subscribed to application
notifications, and the notification will be sent to all subscribed
objects when it is posted.
You should read up on NSNotificationCenter, and on the notifications
that NSApplication posts, specifically
NSApplicationWillTerminateNotification in your case. Your second
object should not set itself as the application delegate, but rather
should subscribe to this notification and handle it accordingly.
Jason
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