具有类数组的SKNode子

Question

我正在尝试编写一个方法来查找属于特定类的SKNode的子类，但是我在这里得到了一个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_INSTRUCTION (code=EXC_i386_INVOP，subcode=0x0)。

Answer 1

试试这段代码

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
    }
}