Create PaginatingLazyVStack as a generic scrollable list container #1983
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| import Foundation | ||
| import SwiftUI | ||
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| // MARK: Implementation | ||
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| public struct PaginatingLazyVStack<Data: Identifiable, Cell: View>: View { | ||
| @Binding var data: [Data] | ||
| @Binding var canShowProgressView: Bool | ||
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| let onRefresh: () async -> Void | ||
| let onDidShowProgressView: () -> Void | ||
| let configureCell: (Data) -> Cell | ||
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| public init( | ||
| data: Binding<[Data]>, | ||
| canShowProgressView: Binding<Bool>, | ||
| onRefresh: @escaping () async -> Void, | ||
| onDidShowProgressView: @escaping () -> Void, | ||
| configureCell: @escaping (Data) -> Cell | ||
| ) { | ||
| self._data = data | ||
| self._canShowProgressView = canShowProgressView | ||
| self.onRefresh = onRefresh | ||
| self.onDidShowProgressView = onDidShowProgressView | ||
| self.configureCell = configureCell | ||
| } | ||
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| public var body: some View { | ||
| ScrollView { | ||
| LazyVStack { | ||
| ForEach(data) { | ||
| configureCell($0) | ||
| } | ||
| .frame( | ||
| maxWidth: .infinity | ||
| ) | ||
| if canShowProgressView { | ||
| HStack { | ||
| Spacer() | ||
| ProgressView() | ||
| .progressViewStyle(.circular) | ||
| .controlSize(.large) | ||
| .onAppear { | ||
| onDidShowProgressView() | ||
| } | ||
| Spacer() | ||
| } | ||
| } | ||
| } | ||
| } | ||
| .refreshable { | ||
| await onRefresh() | ||
| } | ||
| } | ||
| } | ||
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| // MARK: Example view | ||
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| private struct PaginatingLazyVStackExampleCell: View { | ||
| let title: String | ||
| var body: some View { | ||
| Text(title) | ||
| .padding(.all, 10) | ||
| } | ||
| } | ||
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| struct PaginatingExampleModel: Identifiable { | ||
| let title: String | ||
| let id: String | ||
| } | ||
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| struct PaginatingLazyVStackExampleView: View { | ||
| @State var data: [PaginatingExampleModel] = [] | ||
| @State var hasMore: Bool = true | ||
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| var body: some View { | ||
| PaginatingLazyVStack( | ||
| data: $data, | ||
| canShowProgressView: $hasMore, | ||
| onRefresh: { | ||
| await refresh() | ||
| }, | ||
| onDidShowProgressView: { | ||
| DispatchQueue.main.asyncAfter(deadline: .now() + 1) { | ||
| addMore() | ||
| } | ||
| }, | ||
| configureCell: { model in | ||
| PaginatingLazyVStackExampleCell(title: model.title) | ||
| } | ||
| ) | ||
| } | ||
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| private func addMore() { | ||
| for _ in 0...15 { | ||
| let uuid = UUID().uuidString | ||
| self.data.append(PaginatingExampleModel( | ||
| title: "Hello, world \(uuid)", | ||
| id: uuid | ||
| )) | ||
| } | ||
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| if self.data.count > 100 { | ||
| self.hasMore = false | ||
| } | ||
| } | ||
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| private func refresh() async { | ||
| if #available(iOS 16.0, *) { | ||
| try? await Task.sleep(for: .seconds(1)) | ||
| } else {} | ||
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| self.data = [] | ||
| self.addMore() | ||
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| } | ||
| } | ||
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| #Preview { | ||
| PaginatingLazyVStackExampleView() | ||
| } | ||
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these should all be
private