Macro to detect availability of class properties in Objective-C
问题 Xcode 8 introduces Objective-C class properties and I would like to add one to an Objective-C library. However I would like the library to still compile with Xcode 7. Is there an availability check I can do at compile time? Something like #if __hasFeature(objc_class_properties) @property (class, readonly, nonatomic) MySingletonClass *shared; #endif What does work is: #if __clang_major__ >= 8 …but I'd like to check for feature availability rather than CLANG version. 回答1: Searching the LLVM