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# completionCurve

Called when the system needs the animation completion curve for an interactive view controller transition.

```
optional var completionCurve: UIView.AnimationCurve { get }
```

## Return Value

Default value is [`UIView.AnimationCurve.easeInOut`](/documentation/UIKit/UIView/AnimationCurve/easeInOut), with other possible values described in the [`UIView.AnimationCurve`](/documentation/UIKit/UIView/AnimationCurve) type definition.

## Discussion

---

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