Declare property only on iOS

Question

I am making a SpriteKit game for iOS, OSX, and tvOS. I am trying to use the accelerometer for my iOS target. I have the check for iOS on import of the CMMotionManager, but I can't seem to get the check to work when creating my motion manager property.

#if os(iOS)

    import CMMotionManager

#endif



class MainPlayScene: TCScene, SKPhysicsContactDelegate {



    //MARK: Properties

    //Motion

    @available(iOS 9, *) // Does not work, just trying things out....

    var motionManager:CMMotionManager {

        return motionManager

    }

How can I do this check?

EDIT: It is late here, and the more I think about it, correct me if I am on the wrong track all together. How can I use the accelerometer for iOS only and still share my scene code?

Answer 1

You use the same syntax that you used for your import statement. This is also what apple does in their sample game DemoBots.

#if os(iOS)
var motionManager....
#endif

#if os(tvOS)
...
#endif

You can also do multiple checks and use else/else if

 #if os(iOS) || os(tvOS)
 .... 
 #elseif os(OSX)
 ... 
 #endif
 ... // Code for other platforms
 #endif

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

Just curious, any particular reason you make the motionManager property computed?

Declare property only on iOS

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