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

Since Swift 4.2 you can replace

#if os(iOS) || os(watchOS) || os(tvOS)
    let color = UIColor.redColor()
#elseif os(OSX)
    let color = NSColor.redColor()
#else
     println("OMG, it's that mythical new Apple product!!!")
#endif

By

#if canImport(UIKit)
    let color = UIColor.redColor()
#elseif os(OSX)
    let color = NSColor.redColor()
#else
    #error("OMG, it's that mythical new Apple product!!!")
#endif