# RealityViewContentProtocol A protocol representing the content of a reality view. ``` protocol RealityViewContentProtocol ``` ## Overview Do not interface with this protocol directly. Instead, use [`RealityViewContent`](/documentation/RealityKit/RealityViewContent) with your [`RealityView`](/documentation/RealityKit/RealityView). ## Topics ### Managing view content [`func add(Entity)`](/documentation/RealityKit/RealityViewContentProtocol/add(_:)) Adds an entity to this content. [`func remove(Entity)`](/documentation/RealityKit/RealityViewContentProtocol/remove(_:)) Removes an entity from this content, if present. [`associatedtype Entities : EntityCollection`](/documentation/RealityKit/RealityViewContentProtocol/Entities-swift.associatedtype) The type of collection used for `entities`. [`var entities: Self.Entities`](/documentation/RealityKit/RealityViewContentProtocol/entities-swift.property) A collection of RealityKit entities that this view content renders within the scene. ### Handling subscriptions [`func subscribe(to: E.Type, on: (any EventSource)?, (E) -> Void) -> EventSubscription`](/documentation/RealityKit/RealityViewContentProtocol/subscribe(to:on:_:)) Subscribes to an event type, optionally limited to events affecting a source entity or scene. [`func subscribe(to: E.Type, componentType: (any Component.Type)?, (E) -> Void) -> EventSubscription`](/documentation/RealityKit/RealityViewContentProtocol/subscribe(to:componentType:_:)) Subscribes to an event type, optionally limited to a specific component type for component events. [`func subscribe(to: E.Type, on: (any EventSource)?, componentType: (any Component.Type)?, (E) -> Void) -> EventSubscription`](/documentation/RealityKit/RealityViewContentProtocol/subscribe(to:on:componentType:_:)) Subscribes to an event type, optionally limited to events affecting a source entity or scene, or a specific component type for component events. ## Relationships ### Conforming Types [`RealityViewCameraContent`](/documentation/RealityKit/RealityViewCameraContent) [`RealityViewContent`](/documentation/RealityKit/RealityViewContent) --- 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)