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# viewController(forKey:)

Returns a view controller involved in the transition.

```
func viewController(forKey key: UITransitionContextViewControllerKey) -> UIViewController?
```

## Parameters

`key`

The key identifying the view controller you want. For a list of possible keys, see `View Controller Transition Keys`.

## Return Value

The view controller object for the specified key or `nil` if the view controller could not be found.

## Discussion

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