SwiftUI 视图 - 由于“私有”保护级别，初始化程序无法访问

Question

我在一个视图中有列表，选择一行后，想导航到另一个视图。我正在尝试将“LocationInfra”（一个核心数据实体）传递给另一个 ConfigProfileView。当我通过 NavigationLink 调用 ConfigProfileView 时，SummaryView 中出现两个错误

由于“私有”保护级别，“ConfigProfileView”初始化程序无法访问 无法将类型“FetchedResults.Element”（又名“LocationInfra”）的值转换为预期参数类型“Binding”

struct summaryView: View {
 @State public var selectedLocationInfra: LocationInfra? = nil
   var body: some View {
    NavigationView {
        ScrollView(showsIndicators: false){
             ForEach(locationProfiles) { locationProfile in
                 NavigationLink (""){
                   ConfigProfileView(locationInfra: selectedLocationInfra) // get two errors here
                 }
                 label: do {
                   HStack {
                     // some code here
                   }.onTapGesture {
                            selectedLocationInfra = locationProfile
                }

             }
        }
    }
     .navigationTitle("Summary")
  }

}

要显示的视图

 struct ConfigProfileView: View {
   @Environment(\.managedObjectContext) private var viewContext
   @Binding private var locationInfra: LocationInfra? 

    NavigationView {
        ScrollView(showsIndicators: false) {
            VStack (alignment: .leading ) {
                 Text(locationInfra?.locationName!)
            }
        }
    }
  }

如何修复错误？

Answer 1

我假设你的数组可能是这样的：

struct SummaryView: View {
    var locationProfiles: [LocationInfra] = [
        .init(index: 0, locationName: "US"),
        .init(index: 1, locationName: "UK"),
        .init(index: 2, locationName: "SG")
    ]
    
    var body: some View {
        NavigationView {
            ScrollView(showsIndicators: false) {
                ForEach(locationProfiles) { locationProfile in
                    NavigationLink {
                        ConfigProfileView(locationInfra: locationProfile)
                    } label: {
                        Text("Index: \(locationProfile.index)")
                    }
                }
            }
            .navigationTitle("Summary")
        }
    }
}

然后在

ConfigProfileView

，只是为了显示：

struct ConfigProfileView: View {
    @Environment(\.managedObjectContext) private var viewContext
    var locationInfra: LocationInfra?
    
    var body: some View {
        NavigationView {
            ScrollView(showsIndicators: false) {
                VStack (alignment: .leading ) {
                    Text(locationInfra?.locationName ?? "unknown")
                }
            }
        }
    }
}

输出：