Reasons for an IBOutlet to be nil

Question

What are the reasons why an IBOutlet (connected) could be nil?

I have one in may application which is always nil, even if I re

Answer 1

Are you using a UINavigationController?
If so, open your MainWindow.xib in IB and make sure that your root controller's nib name is set correctly in the Attributes Inspector.

Why would this not be set correctly? One reason is the 'rename' refactoring doesn't update this, and then the internals won't find the nib with which to wire your UI. Or you renamed the nib yourself, and didn't update this field.