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DestinationExample.swift
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DestinationExample.swift
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import ComposableArchitecture
import ComposablePresentation
import SwiftUI
struct DestinationExample: ReducerProtocol {
struct State {
enum Destination {
case first(First.State)
case second(Second.State)
case alert(AlertState<Action.Alert>)
}
var destination: Destination?
}
enum Action {
enum Alert {
case firstTapped
case secondTapped
case dismissed
}
case firstButtonTapped
case secondButtonTapped
case alertButtonTapped
case didDismissFirst
case didDismissSecond
case first(First.Action)
case second(Second.Action)
case alert(Action.Alert)
}
var body: some ReducerProtocol<State, Action> {
Reduce { state, action in
switch action {
case .firstButtonTapped, .alert(.firstTapped):
state.destination = .first(First.State())
return .none
case .secondButtonTapped, .alert(.secondTapped):
state.destination = .second(Second.State())
return .none
case .alertButtonTapped:
if #available(iOS 15.0, *) {
state.destination = .alert(AlertState(
title: { TextState("Title") },
actions: {
let actions: [ButtonState<Action.Alert>] = [
ButtonState(action: .firstTapped) {
TextState("Present first")
},
ButtonState(action: .secondTapped) {
TextState("Present second")
},
ButtonState.cancel(TextState("Cancel"))
]
return actions
},
message: { TextState("Message") }
))
}
return .none
case .didDismissFirst:
if (/State.Destination.first).extract(from: state.destination) != nil {
state.destination = nil
}
return .none
case .didDismissSecond:
if (/State.Destination.second).extract(from: state.destination) != nil {
state.destination = nil
}
return .none
case .alert(.dismissed):
if (/State.Destination.alert).extract(from: state.destination) != nil {
state.destination = nil
}
return .none
case .first, .second:
return .none
}
}
.presenting(
unwrapping: \.destination,
case: /State.Destination.first,
id: .notNil(),
action: /Action.first,
presented: { First() }
)
.presenting(
unwrapping: \.destination,
case: /State.Destination.second,
id: .notNil(),
action: /Action.second,
presented: { Second() }
)
}
// MARK: - Child Reducers
struct First: ReducerProtocol {
struct State {
var timer = TimerExample.State()
}
enum Action {
case timer(TimerExample.Action)
}
var body: some ReducerProtocol<State, Action> {
Scope(state: \.timer, action: /Action.timer) {
TimerExample()
}
}
}
struct Second: ReducerProtocol {
struct State {
var timer = TimerExample.State()
}
enum Action {
case timer(TimerExample.Action)
}
var body: some ReducerProtocol<State, Action> {
Scope(state: \.timer, action: /Action.timer) {
TimerExample()
}
}
}
}
struct DestinationExampleView: View {
let store: StoreOf<DestinationExample>
var body: some View {
_NavigationStack {
VStack(alignment: .leading, spacing: 0) {
Button {
ViewStore(store.stateless).send(.firstButtonTapped)
} label: {
Text("→ First (sheet)")
.padding()
}
Button {
ViewStore(store.stateless).send(.secondButtonTapped)
} label: {
Text("→ Second (navigation link)")
.padding()
}
if #available(iOS 15.0, *) {
Button {
ViewStore(store.stateless).send(.alertButtonTapped)
} label: {
Text("→ Alert")
.padding()
}
.alert(
store.scope(
state: { (/DestinationExample.State.Destination.alert).extract(from: $0.destination) },
action: DestinationExample.Action.alert
),
dismiss: .dismissed
)
}
}
.padding()
.sheet(
store.scope(
state: { (/DestinationExample.State.Destination.first).extract(from: $0.destination) },
action: DestinationExample.Action.first
),
onDismiss: { ViewStore(store.stateless).send(.didDismissFirst) },
content: FirstView.init(store:)
)
._navigationDestination(
store.scope(
state: { (/DestinationExample.State.Destination.second).extract(from: $0.destination) },
action: DestinationExample.Action.second
),
onDismiss: { ViewStore(store.stateless).send(.didDismissSecond) },
destination: SecondView.init(store:)
)
}
}
// MARK: - Child Views
struct FirstView: View {
let store: StoreOf<DestinationExample.First>
var body: some View {
VStack {
Text("First").font(.title)
TimerExampleView(store: store.scope(
state: \.timer,
action: DestinationExample.First.Action.timer
))
}
.padding()
}
}
struct SecondView: View {
let store: StoreOf<DestinationExample.Second>
var body: some View {
VStack {
Text("Second").font(.title)
TimerExampleView(store: store.scope(
state: \.timer,
action: DestinationExample.Second.Action.timer
))
}
.padding()
}
}
}
struct DestinationExample_Previews: PreviewProvider {
static var previews: some View {
DestinationExampleView(store: Store(
initialState: DestinationExample.State(),
reducer: DestinationExample()
))
}
}