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# update(_:for:)

Tells you to perform any app specific logic to update your scene.

```
optional func update(_ currentTime: TimeInterval, for scene: SKScene)
```

## Parameters

`currentTime`

The current system time.

`scene`

The scene that is being animated.

## Discussion

Do not call this method directly; it is called by the system exactly once per frame, so long as the scene is presented in a view and is not paused. This is the first method called when animating the scene, before any actions are evaluated and before any physics are simulated.

---

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