swift - How do you use the appropriate color class for the current platform?

Question

I'm trying to share my Scene Kit code across iOS and OS X, but the API calls that accept colors (and images) take either UIColor/UIImage or NSColor/NSImage depending on the platform. How do I create the right class in Swift without duplicating the code?

Answer 1

Use conditional compilation and type aliases:

#if os(OSX)
    typealias Color = NSColor
    typealias Image = NSImage
#else
    typealias Color = UIColor
    typealias Image = UIImage
#endif

Then use Color instead of UIColor or NSColor:

self.gameView!.backgroundColor = Color(red: 0, green: 0.2, blue: 0.5, alpha: 1)

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Edit 2016-01-17: As DDPWNAGE noted above, Apple has created SKColor with basically the same definition.