I want to learn about SwiftUI data flow and lifetime

To learn about SwiftUI data flow and lifetime, you can refer to the session titled "SwiftUI essentials" from WWDC 2024. This session covers the fundamentals of how SwiftUI manages data flow and state changes in your app. Here are some key points from the session:

• SwiftUI views are state-driven, meaning that when your view state changes, SwiftUI automatically updates the UI, eliminating boilerplate and update bugs. SwiftUI maintains a representation of the user interface behind the scenes and updates outputs based on data changes (SwiftUI essentials).

• SwiftUI uses a declarative approach where views are descriptions of the current state of the UI. They are not long-lived object instances that receive imperative commands over time. This is why SwiftUI views are value types defined using structs (SwiftUI essentials).

• SwiftUI provides several tools for state management, including @State and @Binding. @State creates a new internal source of data for a view, while @Binding creates a two-way reference to the data (SwiftUI essentials).

For a more comprehensive understanding, you can watch the session SwiftUI essentials which covers the fundamentals of views and their state-driven nature.