Using struct id in swiftui list

Question

I tried to list a array of struct with swiftUI.

import SwiftUI

struct User: Codable {
    var id: UUID
    var name: String
}

struct MyView: View {
    @State private var users = [User]()

    var body: some View {
        List(users, id: \.id) {    // Type '_' has no member 'id'
            VStack(alignment: .leading) {
                Text($0.name)
                    .font(.headline)
            }
        }
    }
    ...
}

But the compiler report a error show that User struct has no id property.

I think it should be var id: UUID() and the User struct ought to conform to Identifiable as well — One
– One, Commented Mar 11, 2020 at 15:08

Asperi · Accepted Answer · 2020-03-11 14:52:10Z

2

It should be like below

var body: some View {
    List(users, id: \.id) { user in   // << here !!
        VStack(alignment: .leading) {
            Text(user.name)           // << due to in different block
                .font(.headline)
        }
    }
}

answered Mar 11, 2020 at 14:52

Asperi

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Comments

user3441734 · Accepted Answer · 2020-03-11 15:29:48Z

2

At first adding id property is not enough, User has to conform to Identifiable

struct User: Identifiable, Codable {
    var id: UUID
    var name: String
}

Next is easy to use it as the source of List

struct ContentView: View {
    @State private var users = [User]()

    var body: some View {
        VStack {
            List(users) {
                Text($0.name)
                    .font(.headline)
            }
            Button(action: {
                let u = User(id: UUID(), name: "Name \(Int.random(in: 0 ..< Int.max))")
                self.users.append(u)
            }) {
                Text("Add User")
            }
        }
    }
}

List knows the id property exists, so you don't need to use it in the List constructor.

edited Mar 11, 2020 at 15:29

answered Mar 11, 2020 at 15:23

user3441734

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