Objective-C:什么是 [ClassName self];做？

Question

我正在查看 CocoaHTTPServer project 的源代码，更具体地说是 HTTPServer.m 文件，我只是不明白这一行:

connectionClass = [HTTPConnection self];

这是做什么的(是否在任何地方记录)？它是如何编译的？不应该吗

connectionClass = [HTTPConnection class];

Answer 1

在此上下文中，- (id)self 是定义在 NSObject 上的方法。它返回接收器。对于 Class，它显然应该与调用 -(Class)class 执行相同的操作。

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.