SwiftUI Picker - 选项不会显示

Question

我一直在尝试为应用程序实现选择器，但由于某些原因，选项不会弹出。任何帮助将不胜感激！

'''

let strengths = ["Host", "Snacks", "Drinks"]

@State private var viewModel = User.userList

var body: some View {
    
    VStack{

                Section(header: Text("Roles")) {
                    
                    
                    ForEach(User.userList) { user in
                        
                        Picker(user.name, selection: $selectedStrength){
                            
                            ForEach(strengths, id: \.self) { strength in
                                     Text(strength)
                                }
                           
                        }
                        // picker
                     }.padding()
        
                }

 }

'''

Answer 1

"...如何为我的所有用户创建 selectedStrength...", 你可以在你的 User 结构中添加 var strength: String 并在你的 Picker 中使用它，例如在这个示例代码中：

struct User: Identifiable {
    let id = UUID()
    var name: String
    var strength: String  // <-- here
    // ...
}

struct ContentView: View {
    let strengths = ["Host", "Snacks", "Drinks"]
    @State private var viewModel = [User(name: "user1", strength: ""),
                                    User(name: "user2", strength: ""),
                                    User(name: "user3", strength: "")]
    
    var body: some View {
        NavigationView {  // <-- here
            Form {
                Section(header: Text("Roles")) {
                    ForEach($viewModel) { $user in
                        Picker(user.name, selection: $user.strength){
                            ForEach(strengths, id: \.self) { strength in
                                Text(strength)
                            }
                        }
                    }.padding()
                }
            }
        }
    }
}

或者，您可以使用这个：

var body: some View {
    Form {
        Section(header: Text("Roles")) {
            ForEach($viewModel) { $user in
                HStack {
                    Text(user.name)
                    Spacer()
                    Picker("", selection: $user.strength){
                        ForEach(strengths, id: \.self) { strength in
                            Text(strength)
                        }
                    }.pickerStyle(.menu)
                }
            }.padding()
        }
    }
}

SwiftUI Picker - 选项不会显示

SwiftUI Picker - Options won't show

picker

swift

swiftui