Foundation类层次的根是NSObject类,它(和NSObject及NSCopying协议一起)定义了基本的对象属性和行为。Foundation框架的剩余部分由几组相互关联的类和一些独立的类组成。有一些代表基本数据类型的类,如字符串、字节数组、用于存储其它对象的集合类;一些代表系统信息的类,如日期类;还有一些代表系统实体的类,比如端口、线程、和进程。图1、图2、和图3所示的类层次描述了这些类的逻辑分组及其继承关系。
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