What is the internal structure of an Interface Builder .xib file?

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What is the internal structure of a .xib file used by Interface Builder?

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Well a xib file is an XML file used by Interface Builder.

The header usually contains something similar to this:

<archive type="com.apple.InterfaceBuilder3.CocoaTouch.XIB" version="7.10">

Then they consist of 'object' entries which represent objects contained within the nib.

<object class="NSMutableDictionary" key="IBDocument.PluginVersions">

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Right click a xib file > Open As > Source Code

You'll be able to see the entire xib file as code.