swiftui subviews optimization
Asked on 09/26/2024
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To optimize SwiftUI subviews, it's important to understand the distinction between declared and resolved subviews. Declared subviews, like ForEach or Group, define a recipe for producing resolved subviews while the app is running. For instance, a ForEach view is a declared subview that generates a collection of resolved subviews based on data. This approach allows for efficient rendering and updating of views.
In the session Demystify SwiftUI containers, it is explained that breaking up one view into multiple subviews does not hurt performance. SwiftUI's declarative system efficiently manages these subviews, ensuring that the UI remains performant even as the view hierarchy becomes more complex.
Additionally, SwiftUI's composition pattern, as discussed in the session SwiftUI essentials, allows you to organize your code without compromising performance. This pattern is used throughout SwiftUI and is essential for creating user interfaces.
For more detailed insights, you can refer to the sessions:
Migrate your TVML app to SwiftUI
SwiftUI helps you build great apps on all Apple platforms and is the preferred toolkit for bringing your content into the living room with tvOS 18. Learn how to use SwiftUI to create familiar layouts and controls from TVMLKit, and get tips and best practices.
Enhance your UI animations and transitions
Explore how to adopt the zoom transition in navigation and presentations to increase the sense of continuity in your app, and learn how to animate UIKit views with SwiftUI animations to make it easier to build animations that feel continuous.
Demystify SwiftUI containers
Learn about the capabilities of SwiftUI container views and build a mental model for how subviews are managed by their containers. Leverage new APIs to build your own custom containers, create modifiers to customize container content, and give your containers that extra polish that helps your apps stand out.