Swift: Event for when node leaves SKCameraNode's view?

Question

Suppose:

• you have an SKSpriteNode , node , off doing its own thing
• you have implemented an SKCameraNode , cam , to dictate what the player can see
• node has the function:

func onScreen(camera:SKCameraNode) -> Bool {
    if camera.contains(self) { return true } 
    else { return false } 
}

Question How can one add an event listener to node so that when node transitions from within the camera's view to out of the camera's view, it triggers or calls a function?

This looks a bit complicated....

Answer 1

您可以将PhysicsBodies添加到您的节点以及摄像机周围的“特殊边界”节点，然后可以使用物理委托来通知您的节点是否与边界节点相交。