swift - SKSpriteNodes in SKView -

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i trying skspritenodes in skview change alpha. here's code: 

if let nodes = self.gameskview.scene!.children as? [skspritenode] {         node in nodes {             if node.name != "bg" {                 node.alpha = 0             }         } }

with codes, nodes nil when print in gameskview not nil.

println("\(self.gameskview.scene!.children)")

can try me? in advance.

self.gameskview.scene!.children as? [skspritenode]

is non-null if all children skspritenode - as? not filter select elements of particular type, it's type-safe "cast".

i's difficult provide advice how want without knowing want accomplish , more of code.


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