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# UIInterfaceOrientationMask

Constants that specify a view controller’s supported interface orientations.

```
struct UIInterfaceOrientationMask
```

## Overview

Starting in iOS 8, you should employ the [`UITraitCollection`](/documentation/UIKit/UITraitCollection) and [`UITraitEnvironment`](/documentation/UIKit/UITraitEnvironment) APIs, and size class properties as used in those APIs, instead of using [`UIInterfaceOrientation`](/documentation/UIKit/UIInterfaceOrientation) constants or otherwise writing your app in terms of interface orientation.

In earlier versions of iOS, you returned these constants from the [`supportedInterfaceOrientations(for:)`](/documentation/UIKit/UIApplication/supportedInterfaceOrientations(for:)) method or when determining which orientations to support in your app’s view controllers.

## Topics

### Constants

[`portrait`](/documentation/UIKit/UIInterfaceOrientationMask/portrait)

The view controller supports a portrait interface orientation.

[`landscapeLeft`](/documentation/UIKit/UIInterfaceOrientationMask/landscapeLeft)

The view controller supports a landscape-left interface orientation.

[`landscapeRight`](/documentation/UIKit/UIInterfaceOrientationMask/landscapeRight)

The view controller supports a landscape-right interface orientation.

[`portraitUpsideDown`](/documentation/UIKit/UIInterfaceOrientationMask/portraitUpsideDown)

The view controller supports an upside-down portrait interface orientation.

[`landscape`](/documentation/UIKit/UIInterfaceOrientationMask/landscape)

The view controller supports both landscape-left and landscape-right interface orientation.

[`all`](/documentation/UIKit/UIInterfaceOrientationMask/all)

The view controller supports all interface orientations.

[`allButUpsideDown`](/documentation/UIKit/UIInterfaceOrientationMask/allButUpsideDown)

The view controller supports all but the upside-down portrait interface orientation.

### Initializers

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

Creates a new instance with the specified raw value.


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