我需要一种方法来创建更多硬币，并在玩家收集硬币或硬币进入屏幕时将其删除。游戏运行正常，但是当我尝试添加一个NSTimer类似的游戏时：
var timer = NSTimer.scheduledTimerWithTimeInterval(2, target: self, selector: Selector("genrateRandomPositions"), userInfo: nil, repeats: true)
游戏崩溃并给我一个错误：
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: <SKSpriteNode> name:'(null)' texture:[<SKTexture> 'coin' (50 x 68)] position:{1024, 350} size:{50, 68} rotation:0.00'
我知道这是什么意思，同一父节点有多个节点，但是我需要知道是否有一种方法可以代替NSTimer。
我的addCoin函数：
func addcoins(positionY:CGFloat){
self.coinTexture = SKTexture(imageNamed: "coin")
self.coin = SKSpriteNode(imageNamed: "coin")
self.coin.position = CGPointMake(CGRectGetMaxX(self.frame), positionY)
self.coin.physicsBody = SKPhysicsBody(circleOfRadius: self.coin.size.width / 2 )
self.coin.physicsBody?.dynamic = false
self.coin.physicsBody?.categoryBitMask = coinCategory
self.coin.physicsBody?.contactTestBitMask = helicopterCategory
self.coin.physicsBody?.collisionBitMask = NoneCategory
self.coin.physicsBody?.usesPreciseCollisionDetection = true
var moveCoin = SKAction.moveByX(-bgTexture.size().width, y: 0, duration: bgSpeed)
self.addChild(self.coin)
self.coin.runAction(moveCoin)
}
每次制作新硬币时，都需要创建一个新节点，并且应将SKAction添加到场景中之后再运行它。最后，该错误表示您已将节点添加到父节点，而该节点已具有父节点。该错误不会不意味着有一个父多个节点，因为这不应该抛出一个错误。这是一些更新的代码：
func addcoins(positionY:CGFloat){
var coinTexture = SKTexture(imageNamed: "coin")
var newCoin = SKSpriteNode(imageNamed: "coin")
newCoin.position = CGPointMake(CGRectGetMaxX(self.frame), positionY)
newCoin.physicsBody = SKPhysicsBody(circleOfRadius: coin.size.width / 2 )
newCoin.physicsBody?.dynamic = false
newCoin.physicsBody?.categoryBitMask = coinCategory
newCoin.physicsBody?.contactTestBitMask = helicopterCategory
newCoin.physicsBody?.collisionBitMask = NoneCategory
newCoin.physicsBody?.usesPreciseCollisionDetection = true
var moveCoin = SKAction.moveByX(-bgTexture.size().width, y: 0, duration: bgSpeed)
addChild(coin)
coin.runAction(moveCoin)
}
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