与其他类的Swift扩展

Question

我正在制作游戏，并且有一堆向量，每个索引对应于另一个向量中的SKSpriteNode。你可以扩展SKSpriteNode类以包含我在相应索引中存储在其他向量中的属性，然后在SKScene的类声明/实现中创建类型为ExtendedSKSpriteNode的对象吗？我尝试了一点点成功。

//Current Implementation
class OldScene: SKScene {
    var node1 = SKSpriteNode(imageNamed: "who cares")
    var node2 = SKSpriteNode(imageNamed: "doesn't matter")
    var node3 = SKSpriteNode(imageNamed: "this is instantiated")
    var nodeVector: [SKSpriteNode] = [node1, node2, node3]
    var timesWhenSomethingHappensToEachNode: [CGFloat] = [CGFloat(1.2), CGFloat(1.7), CGFloat(3.1)]
    var framesUntilThisOccurs: [Int] = [2, 30, 15]
}

//Desired implementation
extension SKSpriteNode {
    //timesWhenSomethingHappensToEachNode and framesUntilThisOccurs are made properties
    //of SKSpriteNode
    //probably happens in here
}

class NewScene: SKScene {
    //Can we instantiate those extended types here?
    var newNode1 = SKSpriteNode(imageNamed: "who cares")
    var newNode3 = SKSpriteNode(imageNamed: "this is instantiated")

    var nodeOneTime = newNode1.timesWhenSomethingHappensToEachNode
    var framesUntilThreeHappens = newNode3.framesUntilThisOccurs
}