本文深入探讨了Objective-C中的Foundation框架，它提供了一组基础实用类，并引入了未被Objective-C语言覆盖的功能性概念。旨在实现一套基本的工具类、简化软件开发过程、支持Unicode字符串、对象持久化和分布，以及增强跨平台应用的可移植性。
/System/Library/Frameworks/Foundation.framework
The Foundation framework defines a base layer of Objective-C classes. In addition to providing a set of useful primitive object classes, it introduces several paradigms that define functionality not covered by the Objective-C language. The Foundation framework is designed with these goals in mind:
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Provide a small set of basic utility classes.
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Make software development easier by introducing consistent conventions for things such as deallocation.
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Support Unicode strings, object persistence, and object distribution.
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Provide a level of OS independence, to enhance portability.
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