# init(identifier:type:rect:faceYawAngle:) Creates a new observation. ``` init(identifier: Int, type: DockAccessory.Observation.ObservationType, rect: CGRect, faceYawAngle: Measurement? = nil) ``` ## Parameters `identifier` A unique identifier representing the subject in the frame. `type` The type of subject in the frame. `rect` The coordinates of the subject in the frame. `faceYawAngle` The angle of the subject’s face in radians. --- 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)