ios - 在展开可选值时发现 nil - spriteKit

Question

我的触摸事件函数有问题，它说“ fatal error :在展开可选值时意外发现 nil”我正在尝试单击标签下的节点。

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

问题只出现在我的设备上，它在模拟器上完美运行。Xcode 6.4、SDK 8.0、目标 7.0、设备 7.1.2

编辑:

场景中我唯一的 Sprite 代码。单击它时出现展开错误。

   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)

Answer 1

你必须尝试一下设备:

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)") 
       }