Architecture for SwiftUI apps

To understand the architecture for SwiftUI apps, you can refer to the session SwiftUI essentials. Here are some key points from the session:

1. Declarative Structure: SwiftUI apps are built using a declarative structure defined by scenes. For example, a WindowGroup is a type of scene that is created with a content view to display on the screen. This structure allows for easy composition of scenes, especially on multi-window platforms like macOS.

2. Cross-Platform Capabilities: SwiftUI enables you to build apps that work across all Apple platforms. Once you have a user interface built using SwiftUI for one platform, you have a strong foundation to bring that UI to other platforms. This is facilitated by adaptive views and scenes that provide an idiomatic look and feel on any Apple platform.

3. Integration with Other Frameworks: SwiftUI integrates seamlessly with other frameworks in the SDK. For instance, Swift Data can be used to add persistent models to your app, and Swift Charts can be used for creating customizable charts. This integration helps in building comprehensive and feature-rich applications.

4. Customization and Low-Level Control: While SwiftUI provides a high level of abstraction, it also offers low-level APIs for creating custom experiences. You can build your own control styles, use canvas for high-performance imperative drawing, and even apply custom Metal shaders directly to SwiftUI views.

5. Incremental Adoption: SwiftUI can be adopted incrementally, allowing you to integrate it into existing apps or build new apps entirely with SwiftUI. This flexibility ensures that you can leverage SwiftUI's capabilities without needing to rewrite your entire app.

For a deeper dive into these concepts, you can watch the session SwiftUI essentials starting at the "Across all platforms" chapter.