# UIHingeInteraction An interaction for observing the hinge state associated with the view’s hierarchy. ``` @MainActor class UIHingeInteraction ``` ## Overview Add a `UIHingeInteraction` to a view to receive hinge state updates. The interaction’s handler is called when the hinge state changes, or when the interaction moves between hierarchies. When the interaction moves out of a hierarchy that provides hinge updates, the update’s `hinge` is nil. ``` override func viewDidLoad() { super.viewDidLoad() let interaction = UIHingeInteraction { [weak self] _, update in guard let self else { return } // A nil `hinge` indicates the interaction has left a // hierarchy that provides hinge updates. guard let hinge = update.hinge else { handleHingeUnavailable() return } updateAngleDisplay(with: hinge.angle) updateStatusDisplay(with: hinge.status) } view.addInteraction(interaction) } ``` In the example above, the current angle and status of the hinge are displayed as the user interacts with the hinge. ## Topics ### Creating a hinge interaction [`init(updateHandler: (UIHingeInteraction, UIHingeInteraction.Update) -> Void)`](/documentation/UIKit/UIHingeInteraction/init(updateHandler:)) Creates a new hinge interaction with the provided update handler. ### Configuring the interaction [`var isEnabled: Bool`](/documentation/UIKit/UIHingeInteraction/isEnabled) Whether the interaction is enabled. ### Getting hinge updates [`class Update`](/documentation/UIKit/UIHingeInteraction/Update) An update for a `UIHingeInteraction` ## Relationships ### Conforms To [`Hashable`](/documentation/Swift/Hashable) [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`CVarArg`](/documentation/Swift/CVarArg) [`UIInteraction`](/documentation/UIKit/UIInteraction) [`NSObjectProtocol`](/documentation/ObjectiveC/NSObjectProtocol) [`Equatable`](/documentation/Swift/Equatable) [`Sendable`](/documentation/Swift/Sendable) [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) ### Inherits From [`NSObject-swift.class`](/documentation/ObjectiveC/NSObject-swift.class) --- 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)