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mluisbrownstephencelis
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stephencelis
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Generic alerts and action sheets (#201)
* alerts * wip * wip * wip * clean up * wip * wip * wip * wip * format * clean up * clean up * docs * wip * tests * API tweaks * Fix * More API changes * More API changes * More * Fix * Fix docs * Generic alerts optionality (#202) * Use Optional to model generic alerts * Xcode 12 * Refinement * update docs * Fix * Fix * doc fixes * rename * fixes * fixes Co-authored-by: Stephen Celis <[email protected]>
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‎.github/workflows/format.yml

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@@ -18,6 +18,6 @@ jobs:
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- uses: stefanzweifel/git-auto-commit-action@v4
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with:
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commit_message: Run swift-format
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branch: 'master'
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branch: 'main'
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env:
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GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

‎.swiftpm/xcode/xcshareddata/xcschemes/ComposableArchitecture.xcscheme

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‎.swiftpm/xcode/xcshareddata/xcschemes/ComposableCoreLocation.xcscheme

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‎.swiftpm/xcode/xcshareddata/xcschemes/ComposableCoreMotion.xcscheme

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11
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‎Examples/CaseStudies/CaseStudies.xcodeproj/project.pbxproj

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357+
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352358
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@@ -465,7 +471,7 @@
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474+
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‎Examples/CaseStudies/CaseStudies.xcodeproj/xcshareddata/xcschemes/CaseStudies (SwiftUI).xcscheme

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@@ -1,6 +1,6 @@
11
<?xml version="1.0" encoding="UTF-8"?>
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‎Examples/CaseStudies/CaseStudies.xcodeproj/xcshareddata/xcschemes/CaseStudies (UIKit).xcscheme

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@@ -1,6 +1,6 @@
11
<?xml version="1.0" encoding="UTF-8"?>
22
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3+
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‎Examples/CaseStudies/SwiftUICaseStudies/00-RootView.swift

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@@ -63,6 +63,17 @@ struct RootView: View {
6363
)
6464
)
6565

66+
NavigationLink(
67+
"Alerts and Action Sheets",
68+
destination: AlertAndSheetView(
69+
store: .init(
70+
initialState: .init(),
71+
reducer: alertAndSheetReducer,
72+
environment: .init()
73+
)
74+
)
75+
)
76+
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NavigationLink(
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"Animations",
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destination: AnimationsView(

‎Examples/CaseStudies/SwiftUICaseStudies/01-GettingStarted-AlertsAndActionSheets.swift

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Original file line numberDiff line numberDiff line change
@@ -0,0 +1,124 @@
1+
import ComposableArchitecture
2+
import SwiftUI
3+
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private let readMe = """
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This demonstrates how to best handle alerts and action sheets in the Composable Architecture.
6+
7+
Because the library demands that all data flow through the application in a single direction, we \
8+
cannot leverage SwiftUI's two-way bindings because they can make changes to state without going \
9+
through a reducer. This means we can't directly use the standard API to display alerts and sheets.
10+
11+
However, the library comes with two types, `AlertState` and `ActionSheetState`, which can be \
12+
constructed from reducers and control whether or not an alert or action sheet is displayed. \
13+
Further, it automatically handles sending actions when you tap their buttons, which allows you \
14+
to properly handle their functionality in the reducer rather than in two-way bindings and action \
15+
closures.
16+
17+
The benefit of doing this is that you can get full test coverage on how a user interacts with \
18+
with alerts and action sheets in your application
19+
"""
20+
21+
struct AlertAndSheetState: Equatable {
22+
var actionSheet: ActionSheetState<AlertAndSheetAction>?
23+
var alert: AlertState<AlertAndSheetAction>?
24+
var count = 0
25+
}
26+
27+
enum AlertAndSheetAction: Equatable {
28+
case actionSheetButtonTapped
29+
case actionSheetCancelTapped
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case alertButtonTapped
31+
case alertCancelTapped
32+
case decrementButtonTapped
33+
case incrementButtonTapped
34+
}
35+
36+
struct AlertAndSheetEnvironment {}
37+
38+
let alertAndSheetReducer = Reducer<
39+
AlertAndSheetState, AlertAndSheetAction, AlertAndSheetEnvironment
40+
> { state, action, _ in
41+
42+
switch action {
43+
case .actionSheetButtonTapped:
44+
state.actionSheet = .init(
45+
title: "Action sheet",
46+
message: "This is an action sheet.",
47+
buttons: [
48+
.cancel(),
49+
.default("Increment", send: .incrementButtonTapped),
50+
.default("Decrement", send: .decrementButtonTapped),
51+
]
52+
)
53+
return .none
54+
55+
case .actionSheetCancelTapped:
56+
state.actionSheet = nil
57+
return .none
58+
59+
case .alertButtonTapped:
60+
state.alert = .init(
61+
title: "Alert!",
62+
message: "This is an alert",
63+
primaryButton: .cancel(),
64+
secondaryButton: .default("Increment", send: .incrementButtonTapped)
65+
)
66+
return .none
67+
68+
case .alertCancelTapped:
69+
state.alert = nil
70+
return .none
71+
72+
case .decrementButtonTapped:
73+
state.actionSheet = nil
74+
state.count -= 1
75+
return .none
76+
77+
case .incrementButtonTapped:
78+
state.actionSheet = nil
79+
state.alert = nil
80+
state.count += 1
81+
return .none
82+
}
83+
}
84+
85+
struct AlertAndSheetView: View {
86+
let store: Store<AlertAndSheetState, AlertAndSheetAction>
87+
88+
var body: some View {
89+
WithViewStore(self.store) { viewStore in
90+
Form {
91+
Section(header: Text(template: readMe, .caption)) {
92+
Text("Count: \(viewStore.count)")
93+
94+
Button("Alert") { viewStore.send(.alertButtonTapped) }
95+
.alert(
96+
self.store.scope(state: { $0.alert }),
97+
dismiss: .alertCancelTapped
98+
)
99+
100+
Button("Action sheet") { viewStore.send(.actionSheetButtonTapped) }
101+
.actionSheet(
102+
self.store.scope(state: { $0.actionSheet }),
103+
dismiss: .actionSheetCancelTapped
104+
)
105+
}
106+
}
107+
}
108+
.navigationBarTitle("Alerts & Action Sheets")
109+
}
110+
}
111+
112+
struct AlertAndSheet_Previews: PreviewProvider {
113+
static var previews: some View {
114+
NavigationView {
115+
AlertAndSheetView(
116+
store: .init(
117+
initialState: .init(),
118+
reducer: alertAndSheetReducer,
119+
environment: .init()
120+
)
121+
)
122+
}
123+
}
124+
}

‎Examples/CaseStudies/SwiftUICaseStudies/01-GettingStarted-SharedState.swift

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Original file line numberDiff line numberDiff line change
@@ -21,7 +21,7 @@ struct SharedState: Equatable {
2121
enum Tab { case counter, profile }
2222

2323
struct CounterState: Equatable {
24-
var alert: String?
24+
var alert: AlertState<SharedStateAction.CounterAction>?
2525
var count = 0
2626
var maxCount = 0
2727
var minCount = 0
@@ -105,10 +105,11 @@ let sharedStateCounterReducer = Reducer<
105105
return .none
106106

107107
case .isPrimeButtonTapped:
108-
state.alert =
109-
isPrime(state.count)
110-
? "👍 The number \(state.count) is prime!"
111-
: "👎 The number \(state.count) is not prime :("
108+
state.alert = .init(
109+
title: isPrime(state.count)
110+
? "👍 The number \(state.count) is prime!"
111+
: "👎 The number \(state.count) is not prime :("
112+
)
112113
return .none
113114
}
114115
}
@@ -204,14 +205,7 @@ struct SharedStateCounterView: View {
204205
.padding(16)
205206
.frame(minWidth: 0, maxWidth: .infinity, minHeight: 0, maxHeight: .infinity, alignment: .top)
206207
.navigationBarTitle("Shared State Demo")
207-
.alert(
208-
item: viewStore.binding(
209-
get: { $0.alert.map(PrimeAlert.init(title:)) },
210-
send: .alertDismissed
211-
)
212-
) { alert in
213-
SwiftUI.Alert(title: Text(alert.title))
214-
}
208+
.alert(self.store.scope(state: { $0.alert }), dismiss: .alertDismissed)
215209
}
216210
}
217211
}
@@ -249,11 +243,6 @@ struct SharedStateProfileView: View {
249243
}
250244
}
251245

252-
private struct PrimeAlert: Equatable, Identifiable {
253-
let title: String
254-
var id: String { self.title }
255-
}
256-
257246
// MARK: - SwiftUI previews
258247

259248
struct SharedState_Previews: PreviewProvider {

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