<!--
{
  "availability" : [
    "iOS: 18.0.0 -",
    "iPadOS: 18.0.0 -",
    "macCatalyst: 18.0.0 -",
    "macOS: 15.0.0 -",
    "tvOS: 18.0.0 -",
    "visionOS: 2.0.0 -",
    "watchOS: 11.0.0 -"
  ],
  "documentType" : "symbol",
  "framework" : "SwiftUI",
  "identifier" : "/documentation/SwiftUI/HorizontalDirection/Set",
  "metadataVersion" : "0.1.0",
  "role" : "Structure",
  "symbol" : {
    "kind" : "Structure",
    "modules" : [
      "SwiftUI"
    ],
    "preciseIdentifier" : "s:7SwiftUI19HorizontalDirectionO3SetV"
  },
  "title" : "HorizontalDirection.Set"
}
-->

# HorizontalDirection.Set

An efficient set of horizontal directions.

```
@frozen struct Set
```

## Topics

### Initializers

[`init(HorizontalDirection)`](/documentation/SwiftUI/HorizontalDirection/Set/init(_:))

Creates a set of directions containing only the specified direction.

### Type Properties

[`static let all: HorizontalDirection.Set`](/documentation/SwiftUI/HorizontalDirection/Set/all)

A set containing the leading and trailing horizontal directions.

[`static let leading: HorizontalDirection.Set`](/documentation/SwiftUI/HorizontalDirection/Set/leading)

A set containing only the leading horizontal direction.

[`static let trailing: HorizontalDirection.Set`](/documentation/SwiftUI/HorizontalDirection/Set/trailing)

A set containing only the trailing horizontal direction.

## Relationships

### Conforms To

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

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

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

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

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

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

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

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

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

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

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)