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

You have written a comment to delete a node... of course it does not work :-) — Luca Angeletti, Aug 31 '15 at 21:33
hhhh the code is "node.removeFromParent()" its too obvious so i didnt type it — RUON, Aug 31 '15 at 21:38
i think maybe this the problem , i put it in didmovetoview method i dont where i should put it — RUON, Aug 31 '15 at 21:42
Yes that's the problem. Please take a look at my answer and let me know if it does solve your problem. — Luca Angeletti, Aug 31 '15 at 21:43

Luca Angeletti · Accepted Answer · 2015-08-31T22:12:23.293

2

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:

creation of objects
big loops
recursive calls
any crazy code that requires too much time to be executed

Hope this helps.

edited Aug 31 '15 at 22:12

answered Aug 31 '15 at 21:43

Luca Angeletti

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i put it as you said but it gives me compiling error " fatal error: unexpectedly found nil while unwrapping an Optional value" – RUON Aug 31 '15 at 21:46
Did you put it inside your scene? – Luca Angeletti Aug 31 '15 at 21:47
Ok, how is `node` declared? Something like `var node: SKNode!` ? – Luca Angeletti Aug 31 '15 at 21:48
var arrow : SKSpriteNode! – RUON Aug 31 '15 at 21:50
thanks and sorry if i bothering the work it seems work but it remove it inside the scene before it go outside the scene – RUON Aug 31 '15 at 21:59
Yes, it is happening because `CGRectIntersectsRect` does check an intersection between the rectangle of the scene and the rectangle that contains your sprite. I am going to update my answer but you'll need to test it. – Luca Angeletti Aug 31 '15 at 22:01
Good luck with your game ;-) – Luca Angeletti Aug 31 '15 at 22:09

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

1 Answers1

Considerations