Swift 带有类数组的SKNode子节点

我试图编写一个方法来查找属于某个特定类的SKNode的子级，但这里出现了一个EXC错误

有人知道为什么会这样吗

import SpriteKit

extension SKNode {
  func children(#klasses: [AnyClass]) -> [SKNode] {
    var matchedNodes = [SKNode]()
    for child in children as [SKNode] {
      for klass in klasses {
        if child.isKindOfClass(klass) {
          matchedNodes.append(child)
        }
      }

      matchedNodes += child.children(klasses: klasses)
    }
    return matchedNodes
  }

}

class Apple: SKNode {}
class Orange: SKNode {}

let apple = Apple()
let orange = Orange()

apple.addChild(orange)

let fruits = apple.children(klasses: [Apple.self, Orange.self])

错误：

执行被中断，原因：EXC_BAD_指令（代码=EXC_i386_INVOP，子代码=0x0）。

请尝试此代码

extension SKNode {
    func children(#klasses: [AnyObject]) -> [SKNode] {
        var matchedNodes = [SKNode]()
        for child in children as [SKNode]{
            for klass in klasses {
                if child.dynamicType === klass {
                    matchedNodes.append(child)
                }
            }
            matchedNodes += child.children(klasses: klasses)
        }
        return matchedNodes
    }
}

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这管用！我会支持你的答案，但显然我需要一个15 lol的声誉-谢谢！