宏来检测Objective-C中类属性的可用性 [英] Macro to detect availability of class properties in Objective-C

问题描述

Xcode 8引入了Objective-C类属性，我想向Objective-C库添加一个。

Xcode 8 introduces Objective-C class properties and I would like to add one to an Objective-C library.

但是我想让库仍然用Xcode 7编译。有可用性检查我可以在编译时做吗？

However I would like the library to still compile with Xcode 7. Is there an availability check I can do at compile time?

像

#if __hasFeature(objc_class_properties)
@property (class, readonly, nonatomic) MySingletonClass *shared;
#endif

这是什么工作：

#if __clang_major__ >= 8

...但我想检查功能可用性，而不是CLANG版本。

…but I'd like to check for feature availability rather than CLANG version.

推荐答案

搜索 LLVM源代码我发现：

#if __has_feature(objc_class_property)

...。

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