# AccessoryTrackingProvider Provides the real time position of accessories in the user’s environment. ``` final class AccessoryTrackingProvider ``` ## Topics ### Structures [`struct Error`](/documentation/ARKit/AccessoryTrackingProvider/Error) An accessory tracking error. ### Initializers [`convenience init(accessories: [Accessory])`](/documentation/ARKit/AccessoryTrackingProvider/init(accessories:)) Create an accessory tracking provider. ### Instance Properties [`var anchorUpdates: AnchorUpdateSequence`](/documentation/ARKit/AccessoryTrackingProvider/anchorUpdates) An async sequence of all anchor updates. [`var description: String`](/documentation/ARKit/AccessoryTrackingProvider/description) A textual representation of this accessory tracking provider. [`var latestAnchors: [AccessoryAnchor]`](/documentation/ARKit/AccessoryTrackingProvider/latestAnchors) The latest accessory anchors updated with the most recent inertial data. [`var state: DataProviderState`](/documentation/ARKit/AccessoryTrackingProvider/state) The state of this accessory tracking provider. ### Instance Methods [`func predictAnchor(for: AccessoryAnchor, at: TimeInterval) -> AccessoryAnchor?`](/documentation/ARKit/AccessoryTrackingProvider/predictAnchor(for:at:)) Predict an accessory anchor to a target timestamp. [`func updateAccessories([Accessory]) async throws`](/documentation/ARKit/AccessoryTrackingProvider/updateAccessories(_:)) Updates the accessories being tracked by a provider. ### Type Properties [`static var isSupported: Bool`](/documentation/ARKit/AccessoryTrackingProvider/isSupported) Determines whether this device supports the accessory tracking provider. [`static var requiredAuthorizations: [ARKitSession.AuthorizationType]`](/documentation/ARKit/AccessoryTrackingProvider/requiredAuthorizations) The authorization type(s) required by the accessory tracking provider. ## Relationships ### Conforms To [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`DataProvider`](/documentation/ARKit/DataProvider) [`SendableMetatype`](/documentation/Swift/SendableMetatype) [`Sendable`](/documentation/Swift/Sendable) --- 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)