How do I update my old app to use SwiftUI

To update your old app to use SwiftUI, you can follow these steps:

Incremental Adoption: You don't need to rewrite your entire app in SwiftUI. You can incrementally adopt SwiftUI by integrating it with your existing UIKit or AppKit views. This allows you to take advantage of SwiftUI's features without a complete overhaul. For more details, you can refer to the SwiftUI essentials session.
State-Driven Views: SwiftUI is built on the principles of declarative, compositional, and state-driven views. This means that your UI will automatically update when the state changes, reducing boilerplate code and update bugs. You can learn more about this in the SwiftUI essentials session.
Platform Integration: SwiftUI provides platform-idiomatic capabilities and integrates with a wide range of SDKs. This helps you focus on what makes your app unique with less code. You can explore more about this in the SwiftUI essentials session.
Custom Experiences: SwiftUI allows you to create unique custom experiences using low-level APIs. You can build your own control styles, use canvas for high-performance imperative drawing, and even apply custom metal shaders directly to SwiftUI views. This is covered in the SwiftUI essentials session.
Sample Projects and Documentation: Apple provides sample projects and extensive documentation to help you get started with SwiftUI. You can follow along with SwiftUI tutorials that guide you through building different apps. This is mentioned in the SwiftUI essentials session.
Deprecation of TVML: If you are updating a TVML app, note that Apple is deprecating TVMLKit. SwiftUI has everything you need to build rich, fully-featured media catalog and streaming apps for tvOS. You can learn more about migrating from TVML to SwiftUI in the Migrate your TVML app to SwiftUI session.

Relevant Sessions:

By following these steps and utilizing the resources provided by Apple, you can effectively update your old app to use SwiftUI.