SwiftUI Essentials – iOS 14 Edition

54. Integrating SwiftUI with UIKit

Apps developed before the introduction of SwiftUI will have been developed using UIKit and other UIKit-based frameworks included with the iOS SDK. Given the benefits of using SwiftUI for future development, it will be a common requirement to integrate the new SwiftUI app functionality with the existing project code base. Fortunately, this integration can be achieved with relative ease using the UIHostingController.

54.1 An Overview of the Hosting Controller

The hosting controller (in the form of the UIHostingController class) is a subclass of UIViewController, the sole purpose of which is to enclose a SwiftUI view so that it can be integrated into an existing UIKit-based project.

Using a hosting view controller, ...