Objective-C:在 .h 或 .m 中导入标头? [英] Objective-C: Importing headers in .h or .m?

问题描述

我是 Objective-c 的新手，想知道导入我在课堂上使用的一些外部标头的最佳做法.

I'm new to objective-c and would like to know the best practice for importing some external headers that I use in my class.

我应该将#import "classB.h" 存储在我自己的类 .h 文件中还是在 .m 文件中?

Should I be storing the #import "classB.h" in my own classes .h file or in the .m file?

有什么区别?

谢谢！

推荐答案

在头部和 #import 中放置前向类声明 (@class classB;) 是正确的做法.m

It is proper practice to put a forward class declaration (@class classB;) in the header and #import "classB.h in the .m

前向类声明，如 @class classB; 让编译器知道它应该在以后期望该类，并且此时它不应该抱怨它.

A forward class declaration, like @class classB; lets the compiler know it should expect the class later on, and it shouldn't complain about it at the moment.

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