SOLVED: Day 60: Date property blocking my list view

@orochamartins

May '23

I'm facing some problems with this project. I'm able to show everything if i give the type "String" to my "registered" property, but if i change the type to "Date" the list stops showing but no error gets triggered. Don't know what to do...

My code:

import SwiftUI

struct ContentView: View {

   @State private var users = [User]()

    var body: some View {
        NavigationView {
            List (users, id: \.id) { user in
                NavigationLink {
                    UserDetailView(user: user)
                } label: {
                    HStack {
                        VStack (alignment: .leading) {
                            Text (user.name)
                                .font(.headline)
                            Text (user.email)
                                .font(.subheadline)
                        }

                        Spacer()

                        Image(systemName: "circle.fill")
                            .foregroundColor(user.isActive ? .green : .red)
                    }
                }
            }
            .navigationTitle("Profiles")
            .task {
                await users.isEmpty ? loadData() : nil
            }
        }
    }

    func loadData() async {

        guard let url = URL(string: "https://www.hackingwithswift.com/samples/friendface.json") else {
            print("Invalid URL")
            return
        }

        JSONDecoder().dateDecodingStrategy = .iso8601

        do {

            let (data, _) = try await URLSession.shared.data(from: url)

            if let decodedResponse = try? JSONDecoder().decode([User].self, from: data) {
                users = decodedResponse
            }

        } catch {

            print ("Invalid data")

        }

    }

}

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}

import Foundation

struct User: Codable, Identifiable {

    let id: UUID
    let isActive: Bool
    let name: String
    let age: Int
    let company: String
    let email: String
    let address: String
    let about: String
    let registered: Date
    let tags: [String]
    let friends: [Friend]

    var formattedDate: String {
        registered.formatted(date: .abbreviated, time: .omitted)
    }

}

@ygeras

May '23

Hi! The issue is that in your code you have created two instances of Decoder. One with decoding strategy and default one. The latter you use in your do - catch block.

You need to change it as follows:

        let decoder = JSONDecoder() // you create your decoder
        decoder.dateDecodingStrategy = .iso8601 // assign decoding strategy

        do {

            let (data, _) = try await URLSession.shared.data(from: url)

            if let decodedResponse = try? decoder.decode([User].self, from: data) { // use created decoder
                users = decodedResponse
            }

        } catch {

            print ("Invalid data")

        }

in your code you have set it up as:

JSONDecoder().dateDecodingStrategy = .iso8601 // instance one of decoder

        do {

            let (data, _) = try await URLSession.shared.data(from: url)

            if let decodedResponse = try? JSONDecoder().decode([User].self, from: data) { // instance two of decoder which is absolutely new object
                users = decodedResponse
            }

        } catch {

            print ("Invalid data")

        }

@orochamartins

May '23

Thank you very much. Problem fixed.

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