SpriteKit via declares

Is it possible to use SpriteKit through declares? I need to dynamically reference classes which I usually do with NSClassFromString but that doesn’t work, I guess because it’s SK not NS.

[code]soft declare function NSClassFromString lib “Cocoa” (aClassName as CFStringRef) as Ptr

dim ns As Ptr = NSClassFromString(“NSView”) //ns has value
dim sk As Ptr = NSClassFromString(“SKView”) //sk nil/0


Is there some other way or does this have to be done with a plugin?