Make a Game Over Scene - ios

Question

In my game, I want a game over label to appear when the screen is touched during the red light animation. The red light animation is on when the green light animation is off. I want the game screen to pause and the game over label to appear when the player touches the screen during the red light animation. I have this so far, but the app crashes when I try to run it.
Error Message:
Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: 'Attemped to add a SKNode which already has a parent: name:'(null)' text:'Game Over! Tap to Play Again' fontName:'Helvetica' position:{1024, 768}'
override func touchesBegan(touches: NSSet, withEvent event: UIEvent) {
/* Called when a touch begins */
if gameOverLabel.parent == nil
{
self.addChild(gameOverLabel)
}
println(score)
scoreLabel.text = "\(score)"
}

Answer 1

Try this. You were setting the gameOverLabel with a font size that was too big and frame that was outside the screen. This was why it was not visible. Also you have to stop the game when it reaches game over.
if (!self.paused)
{
if isGreenLightON
{
score += 50
}
else
{
self.paused = true
if (gameOverLabel.parent != nil)
{
gameOverLabel.removeFromParent()
}
gameOverLabel.fontName = "Helvetica"
gameOverLabel.fontColor = UIColor.blackColor()
gameOverLabel.fontSize = 24
gameOverLabel.text = "Game Over! Tap to Play Again"
gameOverLabel.position = CGPointMake(CGRectGetMidX(self.frame), self.frame.size.height - 50)
self.addChild(gameOverLabel)
}
}
else
{
score = 0
if (gameOverLabel.parent != nil)
{
gameOverLabel.removeFromParent()
}
self.paused = false
}
scoreLabel.text = "\(score)"