State

A convienence type for the application state to adhere to.

A type of state that can be identified for tracking purposes.

This is typically used for entities stored in your state that might be accessed by id or displayed in a List view.

A container state that holds an ordered collection of substates.

It’s a common requirement to store a collection of substates. For example, a list of entities retrieved from a service. For an optimal solution, you typically require a lookup table of entity states by their ids. However, you also need an ordered array to display those entities in a list to the user. You end up managing both a dictionary of entities and an ordered array of their ids. This struct manages that responsibility for you. It also provides conveniences for direct use by SwiftUI List views.

var todos: OrderedState<TodoState> = ...

// When a user adds a new todo:
todos.append(todo)

// When a user deletes multiple todos
todos.delete(at: indexSet)

// Using the OrderedState with a list view.
var body: some View {
  List {
    ForEach(todos) {
    }
    .onDelete { todos.delete(at: $0 }
    .onMove { todos.move(from: $0, to: $1 }
  }
}