swiftUI中的选择器正在从Firestore中选择文档ID而不是文档字段

因此，我试图在swiftui中的表单中使用选择器中的firebase集合，但当我选择所需的运动时，该运动的文档ID将保存到我的变量中

所以这是我的观点，我有选择者

struct ContentView: View {
    @ObservedObject var sportsObserved = sportsObserver()
    
    @State private var sport = ""

    var body: some View {
        VStack{
            Form {                
                Picker(selection: $sport, label: Text("Sport")) {
                    ForEach(self.sportsObserved.sports) { i in
                        Text(i.sportName)
                    }
                }
                Text("You selected \(sport)")
            }
        }

    }
}

这些是我的Firestore文档的字段

struct datatype3: Identifiable{
    
    var id : String
    var sportName: String
    var eventCount: Int
}

这是我的数据库可观察对象，它不是必需的，但我包含了它，以防有人需要它来完全重现我遇到的错误

class sportsObserver: ObservableObject{
    @Published var sports = [datatype3]()
    init() {
        let db = Firestore.firestore()
        db.collection("sports").addSnapshotListener{ (snap, err) in
            
            if err != nil {
                print((err?.localizedDescription)!)
                return
            }
            for i in snap!.documentChanges{
                
                if i.type == .added {
                    
                    let id = i.document.documentID
                    let sportName = i.document.get("sportName") as! String
                    let eventCount = i.document.get("eventCount") as! Int
                    
                    
                    self.sports.append(datatype3(id: id, sportName: sportName, eventCount: eventCount))
                }
                
                if i.type == .removed {
                  
                     let id = i.document.documentID
                    
                    for j in 0..<self.sports.count{
                        
                        if self.sports[j].id == id{
                            self.sports.remove(at: j)
                            return
                        }
                    }
                }
                
                if i.type == .modified {
                    let id = i.document.documentID
                    let sportName = i.document.get("sportName") as! String
                    let eventCount = i.document.get("eventCount") as! Int


                    for j in 0..<self.sports.count{

                        if self.sports[j].id == id{
                            self.sports[j].sportName = sportName
                            self.sports[j].eventCount = eventCount

                            return
                        }
                    }
                }
            }
        }
    }
}

---

将修复程序发布为社区Wiki以提高可见性：

.onAppear {
            for i in sportsObserved.sports {
                if sportID == i.id {
                    sport = i.sportName
                }
            }

Picker(selection: $sportID, label: Text("Sport")) {
                    ForEach(self.sportsObserved.sports) { i in
                        Text(i.sportName).tag(i.id)
                    }
                }

.onAppear {
            for i in sportsObserved.sports {
                if sportID == i.id {
                    sport = i.sportName
                }
            }

Picker(selection: $sportID, label: Text("Sport")) {
                    ForEach(self.sportsObserved.sports) { i in
                        Text(i.sportName).tag(i.id)
                    }
                }