SwiftUI详细视图和列表索引问题

Question

尝试创建一个包含测试点操作列表的测试卡。 navigationLink转到测试点操作需要完成的数据点列表。

在我尝试添加@Binding之前，以下代码非常有用，因为我需要为DataPointRow上的数据点添加控件和textFields。

ExecutionChecklistView

  @ObservedObject var viewModel: ExecutionChecklistViewModel

    var body: some View {
     NavigationView {
      List (viewModel.testCards, id: \.testPointAction.id) { testCard in
            TestCardView(testCard: testCard)
      }
    }
  }
}

struct TestCardView: View {
  var testCard: TestPoint

  var body: some View {
    NavigationLink(destination: DataPointRow(testCard: testCard)) {
      Text("\(testCard.id)")
      Text("\(testCard.testPointAction.tpAction)")
    }
  }
}

struct DataPointRow: View {
  var testCard: TestPoint

  var body: some View {
    List(testCard.dataPoints, id: \.id) {dataPoint in
      Text("\(dataPoint.name)")

    }
  }
}

testCard：[TestPoint]

struct TestPoint: Decodable, FetchableRecord {
    var testPointAction: TestPointAction
    var dataPoints: [DataPoint]
}

extension TestPoint: Identifiable {
  var id: Int { testPointAction.id }
}

这是我尝试过的。 但是ForEach给出了类型'_'没有成员'element'

struct ExecutionChecklistView: View {
  @ObservedObject var viewModel: ExecutionChecklistViewModel

    var body: some View {
     NavigationView {
      List {
        ForEach(
            Array( viewModel.testCards.enumerated() ),
            id: \.element.id
          ) { index, _ in
            TestCardView(testCard: $viewModel.testCards[index])
        }
      }
    }
  }
}

struct TestCardView: View {
  @Binding var testCard: TestPoint

  var body: some View {
    NavigationLink(destination: DataPointRow(testCard: $testCard)) {
      Text("\(testCard.id)")
      Text("\(testCard.testPointAction.tpAction)")
    }
  }
}

struct DataPointRow: View {
  @Binding var testCard: TestPoint

  var body: some View {
    List(testCard.dataPoints, id: \.id) {dataPoint in
      Text("\(dataPoint.name)")

    }
  }
}

ExecutionChecklistViewModel

class ExecutionChecklistViewModel{
  @Published private var executionChecklist = TestPoints.ExecutionChecklist.empty
  private var cancellables: [AnyCancellable] = []

  init() {
    Current.testPoints()
      .executionChecklistPublisher()
      //Performa a synchronous initial fetch
      .fetchOnSubscription()
      //Ignore database errors
      .catch { _ in Empty() }
      .sink { [unowned self] in self.executionChecklist = $0 }
      .store(in: &cancellables)
  }
}

extension ExecutionChecklistViewModel: ObservableObject, Identifiable {
    var testCards: [TestPoint] {
      executionChecklist.testCards
    }
}

测试点

class TestPoints {
  private let database: DatabaseWriter

  init(database: DatabaseWriter) {
    self.database = database
  }

  struct ExecutionChecklist {
    var testCards: [TestPoint]

    static let empty = ExecutionChecklist(testCards: [])
  }


  func executionChecklistPublisher() -> DatabasePublishers.Value<ExecutionChecklist> {
    ValueObservation
      .tracking(value: {db in

        let request = TestPointAction
          .including(all: TestPointAction.dataPoints)
        let testCards = try TestPoint
          .fetchAll(db, request)


        print (ExecutionChecklist(testCards: testCards))
        return ExecutionChecklist(testCards: testCards)
      })
      .publisher(in: database)
  }

}