Xcode 3/Interface Builder - Adding classes to NIB file doesn't work

I'm attempting to learn Objective-C and Cocoa GUI through Apple's "Currency Convertor" tutorial. I'm currently at the "Add the ConverterController Class to Your Nib File" step, and I add ConverterController.h to the Interface Builder project (both by Read Class Files and dragging) and... nothing happens. The tutorial clearly states that the class should appear as a new icon in the MainMenu.nib window. I've tried researching this problem, and it appears to be quite common, however every fix isn't really a fix at all. They all involve using the Identity Inspector for something, which appears very complicated, and is otherwise uncovered in the tutorial. It occurs to me that anyone knowing enough to be able to use this fix wouldn't be reading this tutorial, thus making such answers moot. Any help anyone could provide on this issue would be appreciated.

The tutorial you linked to should work fine except that they've just got the illustration (Figure 5-3) in the wrong place.
The placement of that illustration implies that you should see the instance of your class in the MainMenu.nib window right after doing step 2 (where you read your class file). But that's not really true. In reality it's step 3 that gets you the blue box in the MainMenu.nib window and steps 4 and 5 that will transform it from an "Object" into a "ConverterController". Steps 3, 4 and 5 are exactly what Thomvis suggested that you do earlier.
Steve

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I want to make a thing in Interface Builder so that when I click on the About "My Application" menu in the Menu Bar at the top a new window comes up.
What I did, was made a new window (HUB) then, deselected Visible at Launch. I did all the linking stuff with applescript and when I tested (Apple - R) it showed up! Any idea why and how to fix this problem?
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bubblejelly wrote:
I want to make a thing in Interface Builder so that when I click on the About "My Application" menu in the Menu Bar at the top a new window comes up.
Umm, OK. But you should get an "About" window by default without having to do anything. Are you saying you want another window too, or a different window than the default one?
What I did, was made a new window (HUB) then, deselected Visible at Launch. I did all the linking stuff with applescript and when I tested (Apple - R) it showed up! Any idea why and how to fix this problem?
HUB? Not sure what that means.
Did you do the Apple-R in Xcode or in Interface Builder? "Test Interface" (or Apple-R) in Interface Builder is not the same as "Build and Run" (Apple-R) in Xcode. In IB if your "not visible" window is open when you do the Apple-R then it will also be open when the interface test is in progress. None of your AppleScript code gets executed when you're testing in IB.
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I had created a new project with the Tab Bar Application Template in XCode. I did not ever touch the AppDelegate classes. Everything used to work perfectly. I must have done something, but now my main view does not load when I Build & Go. Instead, the app terminates due to an uncaught exception. I even tried to undo all my changes and restore the project from a snapshot, but it still will not load. Is this simply a programming bug, or am I doing something wrong? Any help would be greatly appreciated.
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[Session started at 2009-02-04 17:53:16 -0600.]
2009-02-04 17:53:19.783 Pulse New[2457:20b] Unknown class SecondView in Interface Builder file.
2009-02-04 17:53:19.791 Pulse New[2457:20b] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason: '[<Pulse_NewAppDelegate 0x525070> setValue:forUndefinedKey:]: this class is not key value coding-compliant for the key secondView.'
2009-02-04 17:53:19.792 Pulse New[2457:20b] Stack: (
2492227851,
2497429051,
2492226609,
2444026504,
2444025070,
2444568513,
818019035,
2492181573,
818013737,
818022028,
816113908,
816149067,
2444104238,
2491730725,
2491731160,
827745792,
827745989,
816114848,
816160924
[Session started at 2009-02-04 17:53:19 -0600.]
Loading program into debugger…
GNU gdb 6.3.50-20050815 (Apple version gdb-962) (Sat Jul 26 08:14:40 UTC 2008)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "i386-apple-darwin".warning: Unable to read symbols for "/System/Library/Frameworks/UIKit.framework/UIKit" (file not found).
warning: Unable to read symbols from "UIKit" (not yet mapped into memory).
warning: Unable to read symbols for "/System/Library/Frameworks/CoreGraphics.framework/CoreGraphics" (file not found).
warning: Unable to read symbols from "CoreGraphics" (not yet mapped into memory).
Program loaded.
sharedlibrary apply-load-rules all
Attaching to program: `/Users/briancharous/Library/Application Support/iPhone Simulator/User/Applications/ECE31580-35EF-4AE2-B42B-67AEB835F808/Pulse New.app/Pulse New', process 2457.
(gdb)
Message was edited by: brian515

Hey Brian,
I had the same exact issue. I was working on a multi-view app using a tab controller and all of the sudden I get this NSUnknownKeyException. However my invalid key happens to be an outlet to a Picker contained within a subview... I deleted the XIB view which contained the picker and re-impl'd its file's owner. That didnt work.
Finally I recreated the project with the same source code and all of the sudden it worked...
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Xcode 3/Interface Builder - Adding classes to NIB file doesn't work

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