Interface Designer: "Reading Class File" fails

Question

I'm just trying the Apple Cocoa Tutorial (ConcurrencyConverter). I have a problem at the point where you shall load the class file "ConverterController.h" into the Interface Designer. It always fails with the error "Parsed 1 source file, but no buttons were found...".
Even when I copy and paste the header file from the tutorial it doesn't work. It looks like this:
#import <Cocoa/Cocoa.h>
@interface ConverterController : NSObject {
IBOutlet NSTextField *amountField;
IBOutlet NSTextField *dollarField;
IBOutlet NSTextField *rateField;
- (IBAction)convert:(id)sender;
@end
I have no idea what to do now, can you help me?

Answer 1

digitalformula wrote:
Your note about the outlets etc actually being there but needing to look harder made me stare at the screen for a few minutes ... I can't see them though.
Maybe they just don't show up in Xcode 3.2.1???
Hi DF -
I don't know how to guide you further since I don't have 3.2.1. Did you see Ruud's most recent post?
Ruud Wijnands wrote:
... if you click on the connections tab they are shown there in in unconnected state.
Assuming this much hasn't changed since 3.1.4, besides the Class Outlets table in the Identity Inspector, there are two places to look for Outlet and Action connections:
1) When you ctrl-click on an object (e.g. the icon for a controller), a black, floating panel should come up listing all connections from and to that object. Be sure to select the object in the xib (icon) window with the View Mode switch in the Center position. With that View Mode setting, the xib window should display a two column table with a tree of small icons to the left. By expanding the nodes in that tree you should be able to find every object in the xib;
2) When you select an object (in the xib window as above), the Connections Inspector (cmd-5) should display all possible connections from and to the object. I assume this is the view Ruud referred to as "the connections tab".
I don't recall seeing a case where the black panel list differed from the list shown in the Connections Inspector, but it wouldn't hurt to look at both. If neither of the above finds the connections when _you've seen your custom class in the Identity list, and set the object in question to that class_, I might suggest closing the xib and restarting IB. You could also try modifying and resaving your custom object's @interface file just to stir things up a bit (e.g., remove all the IBOutlet declarations, save, then add them and resave).
It might also help to start a new project and do nothing else but add one custom class to see if you have better luck getting IB to import the correct connections in the new context. E.g., add a NSObject subclass named Foo with one ivar such as IBOutlet NSWindow *Bar; then see if you can add a blue cube to MainMenu.xib, set its identity to Foo class and see the Bar outlet.
For more details on connecting custom objects, see "Setting the Class of an Object" and "Injecting Class Information into a Nib File" under Xcode Integration in the +Interface Builder User Guide+.
Of course it's possible we're dealing with a bug that's unique to 64-bit 3.2.1. I've searched the web, the 3.2.1 Release Notes and the Xcode Mailing List for reports that might confirm this, but haven't found anything interesting yet. So I think we should continue to assume that Xcode 3.2.1 is capable of obtaining custom class info, and we're just dealing with some misunderstanding. Hopefully, one of our forum experts who has 3.2.1 will join the thread to shed some more light on the topic.
\- Ray