Problem loading a Nib from a UITabBarController-Collection of common programming errors

I’m trying to load a Nib from a TabBarController. I’m doing this by assigning selectedIndex. The ViewController loaded by index is indicated in the MainWindow.xib where the TabBarController is, assigning the name of the Nib to be loaded in each Tab Bar Item. Loading works, but if I create an IBOutlet in the ViewController to be loaded and link it to anything (the IBOutlet’s object can be of any class) then it crashes in the line where I assign selectedIndex.

Edit>> I have the application delegate which contains a UITabBarController linked to a UITabBarController object created in MainWindow.xib.

In that UITabBarController object there are some Tab Bar Items each one linked to different UIViewControllers. These links are established through the property NIB Name.

I’m trying to test the first item linking it to an empty UIViewController, which in this case I called TestViewController (TestViewController.h, TestViewController.m and TestViewController.xib are created). I wrote TestViewController in the NIB Name property of the first Tab Bar Item. It works.

Now I put an IBOutlet UILabel in the TestViewController. I define it like this in the TestViewController.h:

#import 


@interface TestViewController : UIViewController {
    UILabel *label;
}

@property (nonatomic, retain) IBOutlet UILabel *label;

@end

I then synthesize the label object in the TestViewController.m. I place a UILabel in the TestViewController.xib. It still works.

Then I link the label object defined in the TestViewController to the UILabel I created in the NIB file. I compile and test. It doesn’t work. It crashes in the part where I assign the selectedIndex to the UITabBarController defined in the application delegate. The assignation is made like this:

self.tabBarController.selectedIndex = 0;

I use 0 because I’m testing only with the first Tab Bar Item. It crashes with SIGABRT signal.

Any ideas why this could be happening?