目标C：[ClassName self]是什么？做？ [英] Objective C: What does [ClassName self]; do?
问题描述
I'm looking through the source code for the CocoaHTTPServer project, more specifically the HTTPServer.m file and I just don't understand this line:
connectionClass = [HTTPConnection self];
这做什么？它甚至如何编译？应该不是
What does this do (is it documented anywhere)? How does it even compile? Should it not be
connectionClass = [HTTPConnection class];
推荐答案
在此上下文中， （id）self 是在 NSObject 上定义的方法。它返回接收器。对于 Class ，它显然应该调用 - （Class）类。
In this context, - (id)self is a method defined on NSObject. It returns the receiver. For a Class it should obviously do the same as a call to the -(Class)class.
类对象因此是完全成熟的对象，可以动态类型化，接收消息和从其他类继承方法。它们是特殊的，因为它们是由编译器创建的。
Class objects are thus full-fledged objects that can be dynamically typed, receive messages, and inherit methods from other classes. They’re special only in that they’re created by the compiler.
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