Inheritance(Chapter 8 of Programming in Objective-C 2.0)

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于 2019-08-01 21:21:36 发布

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原文链接：http://www.cnblogs.com/zhtf2014/archive/2010/10/17/1853337.html

本文讨论了使用@class指令在Objective-C编程中如何提高编译效率。通过仅告知编译器类名，而不需要包含整个头文件，可以显著减少编译时间。然而，当需要引用类的方法时，@class指令不足以提供所需的所有信息，因为编译器还需要知道方法参数的数量、类型及返回类型。

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　　Using the @class directive is more efficient because the compiler doesn’t need to process the entire XYPoint.h file (even though it is quite small); it just needs to know that XYPoint is the name of a class. If you need to reference one of the XYPoint classes methods, the @class directive does not suffice because the compiler would need more information; it would need to know how many arguments the method takes, what their types are, and what the method’s return type is.

转载于:https://www.cnblogs.com/zhtf2014/archive/2010/10/17/1853337.html