A reducer represented by multiple enum cases.
protocol CaseReducer<State, Action> : Reducer where Self.Action == Self.Body.Action, Self.Body : Reducer, Self.State : CaseReducerState, Self.State == Self.Body.StateYou should not conform to this protocol directly. Instead, the Reducer macro will add a conformance to enums.
import ComposableArchitectureThe Composable Architecture (TCA, for short) is a library for building applications in a consistent and understandable way, with composition, testing, and ergonomics in mind. It can be used in SwiftUI, UIKit, and more, and on any Apple platform (iOS, macOS, tvOS, and watchOS).
associatedtype State = Self.Stateassociatedtype Action = Self.Actionprotocol Reducer<State, Action>A protocol that describes how to evolve the current state of an application to the next state, given an action, and describes what Effects should be executed later by the store, if any.
associatedtype ActionA type that holds all possible actions that cause the State of the reducer to change and/or kick off a side Effect that can communicate with the outside world.
associatedtype BodyA type representing the body of this reducer.
associatedtype StateA type that holds the current state of the reducer.
protocol CaseReducerStateA state type that is associated with a CaseReducer.
@attached(member, names: named(State), named(Action), named(init), named(body), named(CaseScope), named(scope)) @attached(memberAttribute) @attached(extension, conformances: Reducer, CaseReducer) macro Reducer() Helps implement the conformance to the Reducer protocol for a type.
associatedtype Body = Self.Bodyassociatedtype CaseScope@ReducerBuilder<Self.State, Self.Action> static var body: Body { get }@preconcurrency @MainActor static func scope(_ store: Store<State, Action>) -> CaseScope @attached(member, names: named(State), named(Action), named(init), named(body), named(CaseScope), named(scope)) @attached(memberAttribute) @attached(extension, conformances: Reducer, CaseReducer) macro Reducer(state: _SynthesizedConformance..., action: _SynthesizedConformance...) An overload of Reducer that takes a description of protocol conformances to synthesize on the State and Action types
@attached(peer, names: named(`_`)) macro ReducerCaseEphemeral() Marks the case of an enum reducer as holding onto “ephemeral” state.
@attached(peer, names: named(`_`)) macro ReducerCaseIgnored() Marks the case of an enum reducer as “ignored”, and as such will not compose the case’s domain into the rest of the reducer besides state.
var body: Body { get }