转NSBundle介绍和使用

原文http://blog.csdn.net/totogo2010/article/details/7669837

An NSBundle object represents a location in the file system that groups code and resources that can be used in a program. NSBundle objects locate program resources, dynamically load and unload executable code, and assist in localization. You build a bundle in Xcode using one of these project types: Application, Framework, plug-ins.