Show debug messages if argument is set

Question

In my project i'm showing debug messages with global variable:

struct GVariables {
    static let debug = false
}


if GVariables.debug {
    print("Debug mode enabled")
}

But is it possible to set argument here:

and check debug argument in code. How can i do this ? And is this a correct way ?

http://stackoverflow.com/questions/24003291/ifdef-replacement-in-swift-language ? — Larme, Feb 04 '16 at 15:50

score 1 · Accepted Answer · answered Feb 04 '16 at 16:07

You can get access to those launch arguments and environment variables via NSProcessInfo

if NSProcessInfo.processInfo.arguments["DEBUGRPM"] ...

That's not unreasonable and allows you to change the behavior of a compiled app which can be useful in some cases. It does however have some overhead since you're always performing this check. If you would only ever enable debug logging in a debug build then setting a value in "Swift Compiler - Custom Flags" (as shown in the question @Larme linked) and using an #if DEBUGRPM expression will give you conditionally compiled code, saving the app the work of performing a runtime if test.

Which approach is more reasonable for you will depend on how you plan to use and when you plan to toggle this behavior.

Show debug messages if argument is set

1 Answers1