Data Flow Through SwiftUI
Asked on 06/15/2025
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To understand data flow through SwiftUI, you can refer to several sessions from WWDC that discuss this topic in detail:
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Better together: SwiftUI and RealityKit: This session explains how data can flow between SwiftUI and RealityKit, highlighting the use of observable entities to pass information both ways. It also discusses how to avoid creating infinite loops when data changes trigger view updates. You can explore more about this in the Information flow chapter.
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Optimize SwiftUI performance with Instruments: This session covers best practices for designing data flow in SwiftUI to ensure views update only when necessary, which is crucial for performance. It also introduces the cause and effect graph to visualize data flow and view updates. For more details, check out the Understand causes and effects of SwiftUI updates chapter.
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SwiftUI essentials: This session provides foundational knowledge about how SwiftUI manages state-driven views and updates the UI automatically as data changes. It emphasizes the declarative nature of SwiftUI views and how they are updated efficiently. You can learn more in the Fundamentals of views chapter.
These sessions collectively provide a comprehensive understanding of how data flows through SwiftUI, how to manage state changes, and how to optimize performance by minimizing unnecessary updates.
Better together: SwiftUI and RealityKit
Discover how to seamlessly blend SwiftUI and RealityKit in visionOS 26. We’ll explore enhancements to Model3D, including animation and ConfigurationCatalog support, and demonstrate smooth transitions to RealityView. You’ll learn how to leverage SwiftUI animations to drive RealityKit component changes, implement interactive manipulation, use new SwiftUI components for richer interactions, and observe RealityKit changes from your SwiftUI code. We’ll also cover how to use unified coordinate conversion for cross-framework coordinate transformations.
Optimize SwiftUI performance with Instruments
Discover the new SwiftUI instrument. We’ll cover how SwiftUI updates views, how changes in your app’s data affect those updates, and how the new instrument helps you visualize those causes and effects. To get the most out of this session, we recommend being familiar with writing apps in SwiftUI.
SwiftUI essentials
Join us on a tour of SwiftUI, Apple’s declarative user interface framework. Learn essential concepts for building apps in SwiftUI, like views, state variables, and layout. Discover the breadth of APIs for building fully featured experiences and crafting unique custom components. Whether you’re brand new to SwiftUI or an experienced developer, you’ll learn how to take advantage of what SwiftUI has to offer when building great apps.