How do you change the color of all of the nodes of a specific name in SpriteKit with Swift

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I'm trying to change the color of every single instance of a node in SpriteKit. When I try to put it in the update method, it only changes one and not all of them.

override func update(currentTime: CFTimeInterval) {
    if changeColor == true{

        self.enumerateChildNodesWithName("blocks", usingBlock: {
            node, stop in
            block?.color = UIColor.orangeColor()
        })

    }
}

asked 2 mins ago

ParalaxWobat

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How do you change the color of all of the nodes of a specific name in SpriteKit with Swift