how does swiftUI state management works

SwiftUI state management is a key feature that allows your user interface to automatically update in response to changes in data. In SwiftUI, views are state-driven, meaning that when the state of a view changes, SwiftUI automatically updates the UI to reflect those changes. This eliminates the need for boilerplate code and reduces the likelihood of update bugs.

SwiftUI provides several tools for managing state:

1. State: This is used to create an internal source of data for 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 is useful for simple state management within a single view.

2. Binding: A binding creates a two-way reference to the state of another view. This is useful when you want to share state between a parent view and its child views, allowing them to stay in sync.

3. ObservableObject: This is used for more complex state management where multiple views need to observe changes to a shared data model. By marking a class with @ObservableObject and its properties with @Published, you can ensure that any changes to the data model are automatically reflected in the UI.

SwiftUI also supports animations that can be applied to state changes, allowing for smooth transitions and visual feedback when the state changes. For example, wrapping a state change with withAnimation can apply a default or custom animation to the resulting view updates.

For more detailed information, you can refer to the SwiftUI essentials session from WWDC 2024, which covers the fundamentals of views and state management in SwiftUI.