eption 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent - swift

Question

i cant figure out this problem. Im deleting a certain SpriteNode, than re-adding it sometimes on a condition, however it crashes every time im calling addChild(). I know a SpriteNode can only have one parent so i dont understand this. Here is the relevant code:
override func touchesBegan(touches: NSSet, withEvent event:UIEvent) {
var touch: UITouch = touches.anyObject() as UITouch
var location = touch.locationInNode(self)
var node = self.nodeAtPoint(location)
for var i=0; i < tileNodeArray.count; i++
{
if (node == tileNodeArray[i]) {
flippedTilesCount++;
flippedTilesArray.append(tileNodeArray[i])
let removeAction = SKAction.removeFromParent()
tileNodeArray[i].runAction(removeAction)
if flippedTilesCount == 2
{
var helperNode1 = newMemoLabelNode("first",x: 0,y: 0,aka: "first")
var helperNode2 = newMemoLabelNode("second",x: 0,y: 0,aka: "second")
for var k = 0; k < labelNodeArray.count ;k++
{
if labelNodeArray[k].position == flippedTilesArray[0].position
{
helperNode1 = labelNodeArray[k]
}
if labelNodeArray[k].position == flippedTilesArray[1].position
{
helperNode2 = labelNodeArray[k]
}
}
if helperNode1.name == helperNode2.name
{
erasedTiles = erasedTiles + 2;
}
else
{
for var j = 0; j < flippedTilesArray.count ;j++
{
let waitAction = SKAction.waitForDuration(1.0)
flippedTilesArray[j].runAction(waitAction)
//self.addChild(flippedTilesArray[j]);
}
}
flippedTilesCount = 0;
flippedTilesArray = []
println("erased tiles:")
println(erasedTiles)
}
}
}
}
Appreciate your help!

Answer 1

I would recommend you not to use SKAction.removeFromParent but remove the node itself by calling:
tileNodeArray[i].removeFromParent()
instead of:
let removeAction = SKAction.removeFromParent()
tileNodeArray[i].runAction(removeAction)
The problem might be, that the SKActions don't wait for each other to finish. For example if you call the waitAction, the other actions will keep running.