Re: NSNotificationCenter not always working?
Re: NSNotificationCenter not always working?
- Subject: Re: NSNotificationCenter not always working?
- From: Matt Neuburg <email@hidden>
- Date: Fri, 19 Nov 2010 12:16:13 -0800
> Date: Fri, 19 Nov 2010 11:58:35 -0800
> From: Laurent Daudelin <email@hidden>
> Subject: NSNotificationCenter not always working?
>
> Is there a way to debug why the same "postNotificationName:object:userInfo:" would not work the second time it's called?
In a word - no. This is one of the worst aspects of NSNotificationCenter; I have complained about it many times, filed bugs, etc., and I suggest you do the same. In particular we need a way to ask the center what's registered with it, and for what.
The last time I had a problem such as you describe, it turned out that my own code, far off in a different file, was unregistering me - so, the second time the notification was posted, I was no longer an observer. This was discovered essentially by simple reading all my code really carefully. In fact, by the time I figured it out, I had actually stopped using notifications in that project, because they were so hard to debug.
I complained about this and did receive an interesting suggestion about breakpoints; but this is not as good as a simple ability to query the notification center would be.
<http://www.cocoabuilder.com/archive/cocoa/157926-how-to-debug-notification-that-never-received.html>
And of course a tiny misspelling in the name of a notification will get you too. This can be largely avoided by using a #define but people are often lazy about that.
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