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# UITransitionContextViewControllerKey

The keys you use to identify the view controllers involved in a transition.

```
struct UITransitionContextViewControllerKey
```

## Topics

### Keys

[`from`](/documentation/UIKit/UITransitionContextViewControllerKey/from)

A key that identifies the view controller that’s visible at the beginning of the transition, or at the end of a canceled transition.

[`to`](/documentation/UIKit/UITransitionContextViewControllerKey/to)

A key that identifies the view controller that’s visible at the end of a completed transition.

### Initializers

[`init(rawValue:)`](/documentation/UIKit/UITransitionContextViewControllerKey/init(rawValue:))

Creates a key to identify the view controllers in a transition.


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