如何使用商业在Objective-C的宏观标志？ [英] How can I use commercial at sign in Objective-C macro?

问题描述

我怎么能在Objective-C的宏中使用商业at符号？

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

我知道是不推荐它，但似乎有可能以某种方式？由于 libextobjc 为 @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preprocessor挂羊头卖狗肉，让你认为这是一个 @命令。

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

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

请注意缺少 @ 在尝试。
因此， @weakify 扩展到 @try {} @finally {} [注code] 。

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

您可以使用同样的伎俩，但我建议你坚持使用普通的宏。

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

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