我正在用SwiftUI开发一个应用程序.当我试图显示工作表(以前是模态)时,出现以下错误消息:
Thread 1: Fatal error: No observable object of type BixiStationCombinedListViewModel.Type found.
A View.environmentObject(_:) for BixiStationCombinedListViewModel.Type may be missing as an ancestor of this view.
当我使用@State
变量来显示包含Map View
使用MapKit的模式时,会发生此错误.
我不明白为什么以及如何实施新的Environment Object
.
是因为我在点击CardView
时 Select 的Station
应该被全局存储,并且信息应该被传递给专用的View
吗?
处理@State
的View
人:
struct CardView: View {
@EnvironmentObject var bixiModel: BixiStationCombinedListViewModel
@State private var isModalOpen: Bool = false
var station: BixiStationCombinedViewModel
var body: some View {
ZStack(alignment: .leading) {
Card()
StationTextInfo(station: station)
} .onTapGesture {
self.isModalOpen = true
print(self.isModalOpen)
}
.sheet(isPresented: self.$isModalOpen) {
BixiStationDetailView(station: self.station)
}
}
}
我试图在表格中显示的View
个:
struct BixiStationDetailView: View {
@EnvironmentObject var bixiModel: BixiStationCombinedListViewModel
var station: BixiStationCombinedViewModel
var body: some View {
VStack {
MapView(coordinate: station.coordinate, name: station.name)
}
}
}
最后,目标:
class BixiStationCombinedListViewModel: ObservableObject {
init() {
fetchDataFromApi()
}
@Published var stationsCombinedList = [BixiStationCombinedViewModel]()
var stationsInformationList = [BixiStationInformationViewModel]()
var stationsDataList = [BixiStationDataViewModel]()
func fetchDataFromApi() {
}
}
}
如何消除错误信息并显示正确的View
?