Xcode version 4.6+ doesn’t have the field for setting a storyboard view controller identifier in the attributes inspector tab.
Where can I find it?
It used to be in the attributes inspector, like so:

But now there is only the Title field left:

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I found out that in xcode 4.5 the identifier is replaced by Identity > Storyboard ID, which is now in the identity inspector.
You can see the field below: