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Foundation5 Manual
Introduction
update time：2017-02-10The root of the Foundation class hierarchy is the NSObject class, which (along with the NSObject and NSCopying protocols) defines basic object properties and behavior. The remainder of the Foundation framework consists of several sets of interrelated classes and some independent classes. There are some classes that represent basic data types, such as strings, byte arrays, and collection classes used to store other objects; some classes that represent system information, such as date classes; and some classes that represent system entities, such as ports and threads. , and process.
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