swift #if

参考：https://stackoverflow.com/questions/45484715/swift-multiple-targets-handling-macros-not-working

For Xcode 8 and above, use Active Compilation Conditions setting in Build settings / Swift compiler - Custom flags.

This is the new build setting for passing conditional compilation flags to the Swift compiler. Simply add flags like this: GOLD, SILVER etc. without -D etc. Then check it with compilation conditions like this:

#if GOLD
//
#elseif SILVER
//
#else
//
#endif

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