How to remove node when become outside the scene in Sprite Kit

Question

I am trying to delete node when goes out side the scene and i tried this method to do it

if( CGRectIntersectsRect(node.frame, view.frame) ) {
   // Don't delete your node
} else {
   // Delete your node as it is not in your view
}

but it seems not working any help would be appreciated

Answer 1

This is not going to be the best approach by a performance point of view but if you override the update method in your scene you will be able to write code that gets executed each frame so.

class GameScene : SKScene {

    var arrow : SKSpriteNode?

    override func update(currentTime: NSTimeInterval) {
        super.update(currentTime)

        if let
            arrow = arrow,
            view = self.view
        where
            CGRectContainsRect(view.frame, arrow.frame) == false &&
            CGRectIntersectsRect(arrow.frame, view.frame) == false {
                arrow.removeFromParent()
        }
    }
}

Considerations

Please keep in mind that every code you write inside the update method is executed each frame (60 times per second on a 60fps game) so you should be very careful about that. Typical things you don't want to write inside the update unless it is strictly necessary:

1. creation of objects
2. big loops
3. recursive calls
4. any crazy code that requires too much time to be executed

Hope this helps.