Yes you can do it.
In Swift you can still use the “#if/#else/#endif” preprocessor macros (although more constrained), as per Apple docs. Here’s an example:
#if DEBUG let a = 2 #else let a = 3 #endif
Now, you must set the “DEBUG” symbol elsewhere, though. Set it in the “Swift Compiler – Custom Flags” section, “Other Swift Flags” line. You add the DEBUG symbol with the
-D DEBUG entry.
As usual, you can set a different value when in Debug or when in Release.
I tested it in real code and it works; it doesn’t seem to be recognized in a playground though.
You can read my original post here.
-DDEBUG=1 doesn’t work. Only
-D DEBUG works. Seems compiler is ignoring a flag with a specific value.