# AttachmentContentBuilder A result builder that creates attachment content from closures. ``` @resultBuilder struct AttachmentContentBuilder ``` ## Overview The `buildBlock` methods in this type create [`AttachmentContent`](/documentation/RealityKit/AttachmentContent) instances based on the number and types of sources provided as parameters. RealityKit calls this builder for you when SwiftUI annotates the `attachment` parameter of some [`RealityView`](/documentation/RealityKit/RealityView) initializers that have the `@AttachmentContentBuilder` annotation. ## Topics ### Type Methods [`static func buildBlock() -> EmptyAttachmentContent`](/documentation/RealityKit/AttachmentContentBuilder/buildBlock()) Creates an empty attachment content containing no statements. [`static buildBlock(_:)`](/documentation/RealityKit/AttachmentContentBuilder/buildBlock(_:)) Creates a single content result. [`static func buildEither(first: TrueContent) -> ConditionalAttachmentContent`](/documentation/RealityKit/AttachmentContentBuilder/buildEither(first:)) Provides support for “if” statements in multi-statement closures, producing conditional content for the “then” branch. [`static func buildEither(second: FalseContent) -> ConditionalAttachmentContent`](/documentation/RealityKit/AttachmentContentBuilder/buildEither(second:)) Provides support for “if-else” statements in multi-statement closures, producing conditional content for the “else” branch. [`static func buildExpression(Content) -> Content`](/documentation/RealityKit/AttachmentContentBuilder/buildExpression(_:)) Builds an expression within the builder. [`static func buildIf(Content?) -> Content?`](/documentation/RealityKit/AttachmentContentBuilder/buildIf(_:)) Provides support for “if” statements in multi-statement closures, producing an optional view that is visible only when the condition evaluates to `true`. [`static func buildLimitedAvailability(any AttachmentContent) -> some AttachmentContent`](/documentation/RealityKit/AttachmentContentBuilder/buildLimitedAvailability(_:)) Provides support for “if” statements with `#available()` clauses in multi-statement closures, producing conditional content for the “then” branch, i.e. the conditionally-available branch. --- Copyright © 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)