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Problem binding NSProgressIndicator maxValue to array.@count

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Problem binding NSProgressIndicator maxValue to array.@count

Subject: Problem binding NSProgressIndicator maxValue to array.@count
From: Kenny Leung <email@hidden>
Date: Wed, 23 Jan 2008 14:58:33 -0800

Hi All.

It seems natural to me to bind NSProgressIndicator's maxValue to array.@count, and to bind value to the current index as you iterate through that array. However, I'm having trouble binding maxValue to an array's @count value. When I try to run the program, I get the error:

2008-01-23 14:46:12.779 NSProgressIndicatorBindings[137] *** Uncaught exception: <NSInvalidArgumentException> [<NSCFArray 0x363e00> addObserver:forKeyPath:options:context:] is not supported. Key path: @count

I consulted the Google for an answer, and found this:

    http://www.cocoabuilder.com/archive/message/cocoa/2004/8/17/114844

which eventually points to this:

http://developer.apple.com/documentation/Cocoa/Conceptual/ KeyValueCoding/Concepts/ArrayOperators.html

and it seems that I'm doing it right.

You can find a sample project at

http://www.hexdreams.com/CodeSamples/ NSProgressIndicatorBindings.tar.gz

Has anybody run into this?

Thanks!

-Kenny

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