How state management working in swifui

State management in SwiftUI is a key feature that allows you to create dynamic and responsive user interfaces. SwiftUI views are state-driven, meaning that when your view's 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.

In SwiftUI, state is managed using several tools:

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. For example, if you have a view that allows users to rate something, you can use @State to keep track of the current rating and update it as needed.

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 different views. For instance, if you have a container view that includes a gauge and a rating view, you can use a binding to ensure that both views are synchronized and reflect the same state.

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, you can notify views of changes to its properties, allowing them to update accordingly.

SwiftUI's state management is built on a data-driven approach, where changes in data automatically trigger UI updates. This is further enhanced by SwiftUI's ability to handle animations and transitions seamlessly, providing a smooth and interactive user experience.

For more detailed information, you can refer to the SwiftUI essentials session from WWDC 2024.