如何在 Objective-C 宏中使用商业 at 登录? [英] How can I use commercial at sign in Objective-C macro?

问题描述

如何在 Objective-C 宏中使用商业 at 登录?

How can I use commercial at sign in Objective-C macro?

我知道不建议这样做，但似乎有可能吗?由于libextobjc提供@weakify、@strongify等...

I know it is not recommended, but seems it is possible somehow? Since libextobjc provides @weakify, @strongify, etc...

推荐答案

libextobjc 使用预处理器诡计让你认为它是一个 @command.

libextobjc uses preprocessor trickery to make you think it's an @command.

#define weakify(...) 
    try {} @finally {} 
    metamacro_foreach_cxt(ext_weakify_,, __weak, __VA_ARGS__)

注意 try 上缺少的 @.所以 @weakify 扩展为 @try {} @finally {} [注入代码].

Note the missing @ on the try. So @weakify expands into @try {} @finally {} [injected code].

您可以使用相同的技巧，但我建议您坚持使用普通宏.

You could use the same trick, but I suggest you stick with plain macros.

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