# WKInterfaceActivityRing A view that displays data from a HealthKit activity summary object. ``` class WKInterfaceActivityRing ``` ## Overview The [`WKInterfaceActivityRing`](/documentation/WatchKit/WKInterfaceActivityRing) view displays data from an object, using the Move, Exercise, and Stand activity rings (see [Figure 1](/documentation/watchkit/wkinterfaceactivityring#1965772)).  The activity ring view always appears as a black rectangle with red, green, and blue concentric rings. The rings are centered in the view, and sized to fit the available space (see [Figure 2](/documentation/watchkit/wkinterfaceactivityring#1965773)).  The rings have two different ways to display a lack of data. One indicates that the activity summary is missing, and the other indicates that the activity summary’s values are set to zero. If the ring has a `nil`-valued `activitySummary` property, the rings appear empty (see See [Figure 3](/documentation/watchkit/wkinterfaceactivityring#1965774)). Use this to indicate that there is no summary data available for the specified day (for example, dates in the future).  If the summary has zero-valued quantities set for its value properties, the ring displays a dot at the top of the ring (see [Figure 4](/documentation/watchkit/wkinterfaceactivityring#1965776)). Use this to indicate that the user has not yet burned any active calories, exercised, or earned any stand hours for the specified day.  To display activity summary data from the HealthKit store, use an object. You can also instantiate and display your own objects, as needed. To display data for a ring, the object must have a non-`nil` quantity for both the corresponding value property and goal property (see the following table). |Ring |Value property |Goal property | |--------|--------------------------------------------------------------------------------------------|------------------------------------------------------------------------------------------------| |Move ||| |Exercise| | | |Stand | | | The activity ring view colors a percentage of each ring based on these properties, as shown here: ```objc ring percent = value property quantity / goal property quantity ``` ## Topics ### Setting the Activity Summary [`setActivitySummary(_:animated:)`](/documentation/WatchKit/WKInterfaceActivityRing/setActivitySummary(_:animated:)) Sets the activity summary displayed by the activity ring view. ### Initializing for SwiftUI [`init()`](/documentation/WatchKit/WKInterfaceActivityRing/init()) Creates an activity ring view for use in SwiftUI. --- 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)