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sprite kit - How do you tell if a node is on the screen spritekit swift

I am trying to figure out how to determine if a node is visible on the screen or off the screen. Is this just a true/false property of the node? Thanks. (Using swift spritekit)

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You can use the following to test if a node is in the scene:

if (!intersectsNode(sprite)) {
  println("node is not in the scene")
}

This assumes that self is an SKScene subclass, such as GameScene.


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