IT English Collection(13) of Nib file

http://blog.csdn.net/developer_zhang

parts of your application—such as windows and views—and sometimes to configure objects, such as the controller objects that your application uses to manage its windows and views., as you edit an Interface Builder document, you create an object graph that is then archived when you save the file. When you load the file, the object graph is unarchived.

the object graph—may contain objects that are used to refer to objects that live outside of the document but that may have references to objects in the document, or to which objects in the document may have references. A special placeholder is the File’s Owner.
    At runtime, you load a nib file using the method loadNibNamed:owner: or a . The File’s Owner is a placeholder in the nib file for the object that you pass as the owner parameter of that method. Whatever connections you to and from the File’s Owner in the nib file in Interface Builder are when you load the file at runtime.