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# UIPreferredDefaultInterfaceOrientation

A string that indicates the preferred initial interface orientation for iPad and iPhone apps running on visionOS.

## Discussion

When compatible iPad and iPhone apps run on visionOS, the system references this key to determine the preferred initial interface orientation for the content that appears in a window in the person’s surroundings. This key is optional, and applications that don’t provide a value receive a default interface orientation that the system provides. The system evaluates the key, but might use a different value. For example, if a pre-existing state exists, that state defines the interface orientation. If a preferred interface orientation doesn’t exist in the app’s [`UISupportedInterfaceOrientations`](/documentation/BundleResources/Information-Property-List/UISupportedInterfaceOrientations), the app receives a default interface orientation provided by the system – landscape right for iPad apps, portrait for iPhone apps.

> Note:
> This key doesn’t apply to app’s built against the visionOS SDK.

---

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