Why my node is invisible - sprite-kit

Question

I'm currently trying to make a node that can change it's texture, but it's not visible on the simulator. I know it's there, cause I set showNodesCount to true and it displays that 2 nodes are on scene. It's displaying a cannon node, but not rgyBox node, that should change it's texture if I tap on cannon node. Here is my code:
class GameScene: SKScene {
var gameOver = false
let cannon = SKSpriteNode(imageNamed: "cannon")
let rgyArray = ["redBox", "greenBox", "yellowBox"]
var rgyBlock = SKSpriteNode()
func changeRgyColor() {
var randomRGY = Int(arc4random_uniform(3))
rgyBlock.texture = SKTexture(imageNamed: rgyArray[randomRGY])
}
override func didMoveToView(view: SKView) {
/* Setup your scene here */
cannon.position = CGPointMake(CGRectGetMidX(self.frame), CGRectGetMidY(self.frame))
self.addChild(cannon)
rgyBlock.texture = SKTexture(imageNamed: rgyArray[1])
rgyBlock.position = CGPointMake(self.cannon.position.x, self.cannon.position.y + 20)
self.addChild(rgyBlock)
rgyBlock.zPosition = 10
}
override func touchesBegan(touches: Set<NSObject>, withEvent event: UIEvent) {
for touch: AnyObject in touches {
let location = touch.locationInNode(self)
if self.nodeAtPoint(location) == self.cannon {
changeRgyColor()
}
}
}
What am I doing wrong?

Answer 1

You need to recreate the rgyBlock by calling rgyBlock = SKSpriteNode(imageNamed: rgyArray[1]). Where it is defined at the top, it is defined as nothing. You then need to recreate it in didMoveToView. You can remove the texture set in didMoveToView for the rgyBlock.
You could do it a different way, and put imageNamed: "aTextureNameHere" into the define of rgyBlock. This will give rgyBlock a value. Then you can set the texture (as you already do) in didMoveToView. This way may be quicker and easier.