54.9 Summary

Any apps developed before the introduction of SwiftUI will have been created using UIKit. While it is certainly possible to continue using UIKit when enhancing and extending an existing app, it probably makes more sense to use SwiftUI when adding new app features (unless your app needs to run on devices that do not support iOS 13 or newer). Recognizing the need to integrate new SwiftUI-based views and functionality with existing UIKit code, Apple created the UIHostingViewController. This controller is designed to wrap SwiftUI views in a UIKit view controller that can be integrated into existing UIKit code. As demonstrated in this chapter, the hosting controller can be used to integrate SwiftUI and UIKit both within storyboards and programmatically within code. Options are available to integrate entire SwiftUI user interfaces in independent view controllers or, through the use of container views, to embed SwiftUI views alongside UIKit views within an existing layout.

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