Observable
Observable
Intro
Observable
Code
@Observable
class CustomViewModel {
var data: [CustomData] = []
}
Observation support in SwiftUI is available starting with iOS 17, iPadOS 17, macOS 14, tvOS 17, and watchOS 10.
ObservableObject
Code
// View
@StateObject var model: CustomViewModel = CustomViewModel()
// View Model
class CustomViewModel: ObservableObject {
@Published var data: [CustomData] = []
func fetchRecipes() async {
data = service.getData(serviceType: .privateAPI)
  }
}
Migration
Switch from ObservableObject to Observable macro
apple doc | Migrating from the Observable Object protocol to the Observable macro
Mind Map
No rxSwift equivalent, since in ReactiveIO,X you need to own your viewModel and make sure they are explicitly set whether they can be observed. With SwiftUI + Combine, you can just mark a class as conforming to ObservableObject and swift does internal markup of making sure which variables are annotated with @Published or @State etc.
Errors
ObservedObject initialized twice bug | SO post