##Install Steps
Clone
$ git clone https://github.com/Fykec/emacs-xcode-document-viewer.git
Install
$ cp emacs-xcode-document-viewer ~/.emacs.d
(add-to-list 'load-path "~/.emacs.d/emacs-xcode-document-viewer")
(require 'xcode-document-viewer)
(setq xcdoc:document-path "~/Library/Developer/Shared/Documentation/DocSets/com.apple.adc.documentation.AppleiOS6.0.iOSLibrary.docset")
(setq xcdoc:open-w3m-other-buffer t)
Notice
This sript depend on w3m (http://emacs-w3m.namazu.org/)