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Ninjas are deadly. Chipmunk Ninjas are just weird.
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Marc Wandschneider is a professional software developer with well over fifteen years of industry experience (yes, he really is that old). He travels the globe working on interesting projects and gives talks at conferences and trade shows whenever possible.

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My book, "Core Web Application Programming with PHP and MySQL" is now available everywhere, including

My "PHP and MySQL LiveLessons" DVD Series has just been published by Prentice-Hall, and can be purchased on Amazon, through Informit, or Safari


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GLint zeroOpacity = 0;
[[self openGLContext] setValues:&zeroOpacity forParameter:NSOpenGLCPS...
Posted to: Things I've learned about CoreImage (and Quartz, and OpenGL) in two weeks
Mar 08, 2007 | 20:07:45
Weird Cocoa Errors 101
By marcwan

The other day, I was working on JustLooking, changing the appearance and the like of a couple of dialogs. As I ran the programs and went to show the dialogs (“panels” in the local terminology), nothing would show and I’d get an error in my XCode results window:

"Unknown class 'CustomCombo' in nib file. using 'NSObject' instead."

I spent the next half hour trying to figure out why Interface Builder didn’t know about this class: it was there in the class inspector, and the ui widgets were correctly set up to use that new class, and all the hookups in the UI also seemed correct.

Well, I finally figured out: when I first developed the class, I had some errors in it, but wanted to test a few things out in my program elsewhere. So I had unchecked it in XCode, telling the IDE not to compile and link it.

Thus, when Cocoa tried to load the NIB file, it couldn’t find the definition for the class, and just put in NSObject instead.

Here’s to hoping that this blog entry saves somebody that 30 minutes I spent on that one.

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