Xcode 7 SpriteKit Error with Blocks

问题

Does anybody know why this won't work anymore in Xcode 7 GM?

I have debugged and verified, but even though the nodes are appearing on the scene, they no longer pass touch events to parent nodes.

Below is a fully working example. If you replace the default GameScene from the "New Sprite Kit Game" you can reproduce it yourself.

class GameScene: SKScene {
    override func didMoveToView(view: SKView) {
        let card = Card(imageNamed: "card_background_blank")
        card.name = "Card"
        let stack = Stack(imageNamed: "stack_background")
        stack.name = "Stack"
        addChild(stack)
        stack.addChild(card)
        card.position = CGPointMake(100,100)
        stack.zPosition = 1
        card.zPosition = 1
        stack.position = CGPointMake(506,428)
        card.userInteractionEnabled = false
        stack.userInteractionEnabled = true
    }
    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        print("Touch")
        moveAllCardsAndReturn()
    }
    func moveAllCardsAndReturn () {
        var wait:NSTimeInterval = 1.0
        let waitIncrement:NSTimeInterval = 0.05
        let duration:NSTimeInterval = 0.15
        func removeAndMove(card:Card) {
            let oldParent = card.parent!
            card.removeFromParent()
            addChild(card)
            card.position = CGPointMake(500,48)
            var sequence = [SKAction]()
            sequence.append(SKAction.waitForDuration(wait))
            sequence.append(SKAction.runBlock({
                card.removeFromParent()
                oldParent.addChild(card)
                card.position = CGPointMake(100,100)
            }))
            card.runAction(SKAction.sequence(sequence))
            wait += waitIncrement
        }
        let stack = childNodeWithName("Stack")
        let card = stack?.childNodeWithName("Card")
        removeAndMove(card as! Card)


    }

}

class Stack:SKSpriteNode {
    override func touchesEnded(touches: Set<UITouch>, withEvent event: UIEvent?) {
        print("Stack Touch")
    }
}
class Card:SKSpriteNode {
}

What happens is the scene works correctly, but touches no longer pass to the parent node, even though userInteractionEnabled is false for the card and true for the parent node of the card (a Stack:SKSpriteNode)

So, I have updated this with a working test case. It is a bug, as it works in iOS 8.4 sim, but not in 9 GM. I have submitted it to apple.