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# UIUserInterfaceSizeClass

Constants that indicate the size class of a view.

```
enum UIUserInterfaceSizeClass
```

## Topics

### Constants

[`UIUserInterfaceSizeClassUnspecified`](/documentation/UIKit/UIUserInterfaceSizeClass/unspecified)

Indicates the size class hasn’t been specified.

[`UIUserInterfaceSizeClassCompact`](/documentation/UIKit/UIUserInterfaceSizeClass/compact)

Indicates a compact size class.

[`UIUserInterfaceSizeClassRegular`](/documentation/UIKit/UIUserInterfaceSizeClass/regular)

Indicates a regular size class.

### Initializers

[`init(_:)`](/documentation/UIKit/UIUserInterfaceSizeClass/init(_:))

Creates a size class from the specified SwiftUI size class.

## Relationships

### Conforms To

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Hashable`](/documentation/Swift/Hashable)

[`Equatable`](/documentation/Swift/Equatable)

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

---

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