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# pageViewController(_:willTransitionTo:)

Called before a gesture-driven transition begins.

```
optional func pageViewController(_ pageViewController: UIPageViewController, willTransitionTo pendingViewControllers: [UIViewController])
```

## Parameters

`pageViewController`

The page view controller.

`pendingViewControllers`

The view controllers that are being transitioned to.

## Discussion

If the user aborts the navigation gesture, the transition doesn’t complete and the view controllers stay the same.

---

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