108 lines
2.5 KiB
Swift
108 lines
2.5 KiB
Swift
import SwiftUINavigation
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struct OptionalSheets: View {
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@ObservedObject private var viewModel = ViewModel()
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var body: some View {
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List {
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Section {
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Stepper("Number: \(self.viewModel.count)", value: self.$viewModel.count)
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HStack {
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Button("Get number fact") {
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self.viewModel.numberFactButtonTapped()
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}
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if self.viewModel.isLoading {
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Spacer()
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ProgressView()
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}
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}
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} header: {
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Text("Fact Finder")
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}
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Section {
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ForEach(self.viewModel.savedFacts) { fact in
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Text(fact.description)
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}
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.onDelete { self.viewModel.removeSavedFacts(atOffsets: $0) }
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} header: {
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Text("Saved Facts")
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}
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}
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.sheet(unwrapping: self.$viewModel.fact) { $fact in
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NavigationView {
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FactEditor(fact: $fact.description)
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.disabled(self.viewModel.isLoading)
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.foregroundColor(self.viewModel.isLoading ? .gray : nil)
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.navigationBarItems(
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leading: Button("Cancel") {
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self.viewModel.cancelButtonTapped()
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},
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trailing: Button("Save") {
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self.viewModel.saveButtonTapped(fact: fact)
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}
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)
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}
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}
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.navigationBarTitle("Sheets")
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}
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}
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private struct FactEditor: View {
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@Binding var fact: String
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var body: some View {
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VStack {
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if #available(iOS 14, *) {
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TextEditor(text: self.$fact)
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} else {
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TextField("Untitled", text: self.$fact)
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}
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}
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.padding()
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.navigationBarTitle("Fact Editor")
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}
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}
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private class ViewModel: ObservableObject {
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@Published var count = 0
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@Published var fact: Fact?
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@Published var isLoading = false
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@Published var savedFacts: [Fact] = []
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private var task: Task<Void, Error>?
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deinit {
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self.task?.cancel()
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}
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func numberFactButtonTapped() {
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self.isLoading = true
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self.fact = Fact(description: "\(self.count) is still loading...", number: self.count)
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self.task = Task { @MainActor in
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let fact = await getNumberFact(self.count)
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self.isLoading = false
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try Task.checkCancellation()
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self.fact = fact
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}
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}
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func cancelButtonTapped() {
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self.task?.cancel()
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self.task = nil
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self.fact = nil
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}
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func saveButtonTapped(fact: Fact) {
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self.task?.cancel()
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self.task = nil
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self.savedFacts.append(fact)
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self.fact = nil
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}
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func removeSavedFacts(atOffsets offsets: IndexSet) {
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self.savedFacts.remove(atOffsets: offsets)
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}
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}
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