How to determine device type from Swift? (OS X or iOS)

Question

I know Swift is relatively new, but I was wondering if there was a way to determine the device type?

(Like you used to be able to do with a #define)?

Answer 1

This should provide you with every use case:

#if os(OSX)
    print("macOS")
#elseif os(watchOS)
    print("watchOS")
#elseif os(tvOS)
    print("tvOS")
#elseif os(iOS)
    #if targetEnvironment(macCatalyst)
        print("macOS - Catalyst")
    #else
        print("iOS")
    #endif
#endif