xcode nib file

The official said that when the document is created when a new application contains one or more nib files. But here I do not have such a document is how it happened? I will create a single view of the basic engineering ios
Reply:
According to which the template is created?
Reply:
single viewer ....
Reply:
Build window base application will no nib file.
Reply:
Create a view-based applications have friends nib file
Reply:
nib file format suffix for xib.
Also, if you are using a xcode4.2 when creating the project, the choice is use storyboard will no nib file, but storyboard format
Reply:
After compiling xib nib is up. The default template is used windowsbase without xib, but the view-base template are with xib files.