How the state management in SwiftUI works?

State management in SwiftUI is a fundamental concept that ensures your user interface stays in sync with the underlying data. Here are the key points on how it works:

1. State-Driven Views: SwiftUI views are state-driven, meaning that when your view state changes, SwiftUI automatically updates the UI. This eliminates the need for boilerplate code and reduces update bugs. SwiftUI maintains a representation of the user interface behind the scenes and updates the outputs based on the new data values (SwiftUI essentials).

2. State and Binding:

   • State: This is used to create a new internal source of data for a view. When you mark a view property as @State, SwiftUI manages the storage and provides it back for the view to read and write. For example, a view can use state to keep track of a rating value and update it over time (SwiftUI essentials).
   • Binding: This creates a two-way reference to the state of another view. It allows a child view to read and write a value owned by a parent view. This is useful for creating reusable components that need to modify shared state (SwiftUI essentials).

3. Observable Objects: SwiftUI can also work with observable objects. These are classes that conform to the ObservableObject protocol and use the @Published property wrapper to notify views of changes. This allows for more complex state management scenarios where multiple views depend on the same data (SwiftUI essentials).

4. Declarative Syntax: SwiftUI views are descriptions of what the current state of the UI should be. They are value types defined using structs, which makes them lightweight and easy to manage. SwiftUI takes these descriptions and creates an efficient data structure to represent them, updating the UI as needed (SwiftUI essentials).

5. Animations: State changes can be animated by wrapping them in an withAnimation block. SwiftUI applies default animations or allows you to customize them, ensuring smooth transitions between state changes (SwiftUI essentials).

For a deeper dive into these concepts, you can watch the session SwiftUI essentials.