ios - 展开可选值时发现nil-spriteKit

我的触摸事件功能有问题，它说“严重错误:在展开可选值时意外发现nil”
我试图单击标签下的节点。

override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
    let location: CGPoint = touches.anyObject().locationInNode(self)
    let nodes: NSArray = nodesAtPoint(location)

       for node: AnyObject in nodes {
           println("node name : " + node.name) // Error here
       }

错误:

fatal error: unexpectedly found nil while unwrapping an Optional value

控制台输出:

node name : myLabel
node name : MyNode

该问题仅出现在我的设备上，在模拟器上运行良好。
Xcode 6.4，SDK 8.0，目标7.0，设备7.1.2

编辑:

我唯一的精灵代码。当我单击它时，得到了解开的错误。

   var score: SKLabelNode = SKLabelNode()
    score.text = "0"
    score.name = "scoreLabel"
    score.fontName = "Chalkduster"
    score.fontSize = 42
    score.zPosition = 100
    score.fontColor = UIColor.redColor()
    score.position = CGPointMake(CGRectGetWidth(self.frame) - 50, CGRectGetHeight(self.frame) - 40)
    self.addChild(score)

最佳答案

您必须尝试使用​​以下设备:

override func touchesBegan(touches: NSSet!, withEvent event: UIEvent!) {
    let location: CGPoint = touches.anyObject().locationInNode(self)
    let nodes: NSArray = nodesAtPoint(location)

       for node: AnyObject in nodes {
           let strName = node.name as string
           println("node name : \(strName)")
       }