Very basic problem with Tab Bar Application and Interface Builder

I'm going to try the final SDK version, which has just finished downloading... it might 'fix' the issue.

Otherwise I'd really appreciate if someone can help out with this, please post questions if I haven't explained something.

I have just installed the latest SDK (final version) and the problem still persists...

Has anyone else experienced similar issues with IB?

Yes, that would have been useful to post up! 🙂

Here is the exception:

TabBarTest2[426:20b] * Terminating app due to uncaught exception 'NSUnknownKeyException', reason:
 '[<UIViewController 0x44ee20> setValue:forUndefinedKey:]: 
this class is not key value coding-compliant for the key myLabel.'

Also, this is the code in the header file, the IBOutlet line is the only line I've added:

#import <UIKit/UIKit.h>
@interface FirstViewController : UIViewController {
 IBOutlet UILabel* myLabel;
}
@end

Thanks David, I've checked the File Owner 'View' and all is connected up fine.

I think it's something to do with the UITabBarController in Interface Builder. For the UITabBarController there are two UIViewControllers (so you tab between two views). One UIViewController is set up so that in 'View Controller Attributes' the 'NIB Name' is set to the name of the NIB file (without any file-extension).

I've tested this part and it works fine, but it only stops working as soon as I add objects to the UIViewController and try to connect them up. Left un-connected, it works.

Hmm, that sounds plausible. I'm not sure I completely understand what you suggest... but I've mailed Tech Support and asked them to look at this thread.

If they reply and I solve the issue, I'll post here.

I'm sure the solution is very simply, which is very frustrating. I only recently decided to go all out with using IB, rather than set everything up in code, I'd still like to go down this route, hopefully someone can point me in the right direction soon.

No solution yet.


I've googled everything I can think of, but very few leads...

It must be something in IB, but I just can't see what - incredibly frustrating.

OK - I have found the problem.

In IB, when using UITabBarController which has multiple UIViewControllers which all separately have their own NIB file assigned, there are two places where you need to set your UIViewController class file.

First, the obvious one was within the NIB file for each UIViewController.

Secondly, where I'd missed it, is withing the NIB file for your UITabBarController. In each UIViewController, not only do you set your NIB file, but also the Class.

Many hours later - I am a happy person.