# WKHostingController A WatchKit interface controller that hosts a SwiftUI view hierarchy. ``` @MainActor @preconcurrency class WKHostingController where Body : View ``` ## Overview A [`WKHostingController`](/documentation/SwiftUI/WKHostingController) presents and manages your app’s main interface using SwiftUI views. You must subclass [`WKHostingController`](/documentation/SwiftUI/WKHostingController) and override the [`body`](/documentation/SwiftUI/WKHostingController/body) property to provide the set of SwiftUI views you want to display. Display the content of your hosting controller as you would any other object. For example, you can include it as one of your app’s root interface controllers, or present it modally. ## Topics ### Creating a hosting controller object [`init()`](/documentation/SwiftUI/WKHostingController/init()) Creates a hosting controller object that you can use to implement your app’s main interface using SwiftUI views ### Getting the root view [`body`](/documentation/SwiftUI/WKHostingController/body) The root view of the view hierarchy to display for your interface controller. ### Updating the root view [`updateBodyIfNeeded()`](/documentation/SwiftUI/WKHostingController/updateBodyIfNeeded()) Updates the interface controller’s set of views immediately, if updates are pending. [`setNeedsBodyUpdate()`](/documentation/SwiftUI/WKHostingController/setNeedsBodyUpdate()) Invalidates the current SwiftUI views and triggers an update during the next cycle. --- 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)