swiftUI dataflow | Ask WWDC

SwiftUI data flow is a key concept in building apps with SwiftUI, as it emphasizes a declarative approach to UI development. In SwiftUI, views are state-driven, meaning that when your view state changes, SwiftUI automatically updates the UI to reflect those changes. This eliminates the need for boilerplate code and reduces the likelihood of update bugs.

Here are some key points about SwiftUI data flow from the "SwiftUI essentials" session:

State Management: SwiftUI uses state to manage the internal data of a view. When you mark a view property with @State, SwiftUI manages the storage and provides it back for the view to read and write. This allows the view to react to changes in its state and update accordingly.
Bindings: A binding creates a two-way reference to the state of another view. This is useful for creating interactive components where changes in one view need to be reflected in another.
View Composition: SwiftUI views are value types defined using structs, which are descriptions of what the current state of the UI should be. This allows for efficient data structures and performance optimization, as views are not long-lived object instances.
Dependency Tracking: SwiftUI keeps track of dependencies between views and their data. When data changes, SwiftUI updates the views that depend on that data, ensuring that the UI remains consistent with the underlying state.

For more detailed information, you can refer to the SwiftUI essentials session, which covers these concepts in depth.