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removeObserver:forKeyPath: when already removed

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removeObserver:forKeyPath: when already removed

Subject: removeObserver:forKeyPath: when already removed
From: James Walker <email@hidden>
Date: Wed, 11 Nov 2009 14:35:16 -0800

I had a situation where removeObserver:forKeyPath: was called twice for the same receiver (an NSUserDefaultsController), the same observer, and the same key path. It threw an NSRangeException. But the KVO docs don't say anything about removeObserver:forKeyPath: throwing an exception. Should this be considered a documentation bug, or is it a bug that -[NSUserDefaultsController removeObserver:forKeyPath:] threw an exception, or should I have just expected this due to some general principle? -- James W. Walker, Innoventive Software LLC <http://www.frameforge3d.com/> _______________________________________________

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