现在有了，__auto_type.例如...

There is now, __auto_type. For example...

__auto_type test = @"Hello World";

...导致测试的类型为 NSString*.

...results in test having the type NSString*.

这是一篇不错的文章:

https://medium.com/@maicki/type-inference-with-auto-type-55a38ef56372

作者建议使用

#define let __auto_type const
#define var __auto_type

在您的应用程序中的某些共享标头中，以使使用更简洁.我个人对这种宏的用法有点警惕，但我已经这样做了一段时间，世界仍在转动……也许不太可能引起冲突的宏名称会更好.

in some shared header in your application to make the usage cleaner. I'm a bit wary of this kind of macro usage personally but I've been doing it for a while and the world is still turning... Maybe macro names less likely to cause a collision would be better.