How is an IBOutlet UIViewController constructed?

I'm extending Apple's template for lazy table image loading. I would like the following code to run when RootViewController is constructed.

[[NSNotificationCenter defaultCenter] addObserver:self 
selector:@selector(applicationWillEnterForeground:)
name:UIApplicationWillEnterForegroundNotification
object: nil];

The problem is I don't how how RootViewController is constructed. I tried the following two methods, but they were never executed. I put NSLog in those methods and they were never printed out.

- (id)initWithNibName:(NSString *)nibNameOrNil 
               bundle:(NSBundle *)nibBundleOrNil
- (id)init

I opened MainWindow.xib and noticed that it loads RootViewController as an IBOutlet in the UIApplicati开发者_开发问答onDelegate. Now, RootViewController is a subclass of UIViewController. So the question boils down to "how is an IBOutlet UIViewController constructed?"

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You can executed the code you need to execute in the awakeFromNib method, this is called by the decoder once the outlet is created.