问题
I have a really small lightweight application which needs to use some constants that are stored in a larger framework. I don't want to duplicate these constants and hardcode them into the lightweight application but I also don't want to have to link against the large framework to just get the constants.
The constants are defined using static NSString *const in a header file. Does replacing the static NSString *const with #define prevent me from having to link against the whole framework ?
To be honest, I'm not entirely sure how linking works so I'm probably thinking about this incorrectly
回答1:
Yes, if you #define the constants you just need to #import the .h file that contains them.
You do need to be aware that the #defined constants are literal text substitutions -- they have no "type", etc, as static const values would.
But another option (for integer constants only) is to define C-style enums in a .h file.
来源：https://stackoverflow.com/questions/8017032/define-vs-const-and-linking-against-frameworks