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# State restoration keys

Keys that are available in restoration archives.

## Topics

### Keys

[`class let stateRestorationViewControllerStoryboardKey: String`](/documentation/UIKit/UIApplication/stateRestorationViewControllerStoryboardKey)

A reference to the storyboard that contains the view controller.

[`class let stateRestorationBundleVersionKey: String`](/documentation/UIKit/UIApplication/stateRestorationBundleVersionKey)

The version of your app responsible for creating the restoration archive.

[`class let stateRestorationUserInterfaceIdiomKey: String`](/documentation/UIKit/UIApplication/stateRestorationUserInterfaceIdiomKey)

The user interface idiom that was in effect when your app created the restoration archive.

[`class let stateRestorationTimestampKey: String`](/documentation/UIKit/UIApplication/stateRestorationTimestampKey)

The time your app created the restoration archive.

[`class let stateRestorationSystemVersionKey: String`](/documentation/UIKit/UIApplication/stateRestorationSystemVersionKey)

The version of the system on which your app created the restoration archive.


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