sprite kit - How do I use whiteColor in Swift and SpriteKit -

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i'm running yosemite , xcode 6. created new project using "game" option, spritekit , swift.

in override didmovetoview() in gamescene.swift added following line try change ground color:

self.backgroundcolor = skcolor(whitecolor)

this compiles won't run, stopping error "use of unresolved identifier 'whitecolor'"

the import is:

import spritekit

do need import whitecolor defined (which assume constant in header file somewhere ?

+[skcolor whitecolor] class method, usual, translate skcolor.whitecolor()

self.backgroundcolor = skcolor.whitecolor()

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