SwiftUI architecture

SwiftUI architecture is a key topic covered in the SwiftUI essentials session at WWDC 2024. Here are some important points about SwiftUI architecture:

1. Declarative Syntax: SwiftUI views are expressed declaratively. You describe what view you want in your user interface, and SwiftUI produces the result. This declarative syntax applies to various UI elements and containers (SwiftUI essentials).

2. Compositional: SwiftUI views are compositional, meaning you can break up one view into multiple smaller views without hurting performance. This allows for better organization of code (SwiftUI essentials).

3. State-Driven: SwiftUI views are state-driven. When your view state changes, SwiftUI automatically updates the UI, eliminating boilerplate code and update bugs. SwiftUI maintains a representation of the user interface behind the scenes and updates it as data changes (SwiftUI essentials).

4. App Definition: The entire app definition in SwiftUI is built on the same principles as views. An app is a declarative structure defined by scenes, such as WindowGroup, which can be composed together on multi-windowed platforms like macOS. This pattern extends to building custom widgets as well (SwiftUI essentials).

5. Interoperability: SwiftUI offers seamless interoperability with UIKit and AppKit. You can use UIViewRepresentable to create and update UIKit or AppKit views within SwiftUI, and HostingViewController to embed SwiftUI views into UIKit or AppKit view hierarchies (SwiftUI essentials).

6. Platform-Specific APIs: While SwiftUI has a common set of high and low-level components across platforms, it also includes specialized APIs for each platform to accommodate their unique designs and usage patterns (SwiftUI essentials).

For a more detailed exploration of SwiftUI architecture, you can refer to the SwiftUI essentials session.