SOLVED: passing structure to new view

@MrGLWatson

Sep '20

This is some example code. I want to pass the User structure to a new view to display the fields. Not sure whats the best way though. Here is my example code

import SwiftUI
import Combine

struct User: Decodable {
    var id: UUID
    var name: String

    static let `default` = User(id: UUID(), name: "Anonymous")
}

struct ContentView: View {
    @State private var requests = Set<AnyCancellable>()

    var body: some View {
        Button ("Fetch Data") {
            let url = URL(string: "https://www.hackingwithswift.com/samples/user-24601.json")!
            self.fetch(url, defaultValue: User.default) {
                print($0.name)
            }
        }
    }

    func fetch<T: Decodable>(_ url: URL, defaultValue: T, completion: @escaping (T) -> Void) {
        let decoder = JSONDecoder()

        URLSession.shared.dataTaskPublisher(for: url)
        .retry(1)
            .map(\.data)
            .decode(type: T.self, decoder: decoder)
            .replaceError(with: defaultValue)
            .receive(on: DispatchQueue.main)
            .sink(receiveValue: completion)
            .store(in: &requests)
    }
}

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

@teamsuperpanda

Sep '20

Here is an example using a similar video Paul did where he fetched both messages and favourates.

I just had this loaded up already but here he uses the same fetch method but I have it in a list with a navigation link pushing a VStack of both who the message is from and what the message is.

import SwiftUI
import Combine

struct Message: Decodable, Identifiable {
    var id: Int
    var from: String
    var message: String
}

struct ContentView: View {
    @State private var requests = Set<AnyCancellable>()
    @State private var messages = [Message]()

    var body: some View {
        NavigationView {
            List(messages) { message in
                NavigationLink(destination:
                    VStack {
                        Text(message.from)
                            .font(.title)
                            .padding()
                        Text(message.message)
                            .padding()
                }) {
                    Text(message.from)
                }
            }
            .navigationBarTitle("Messages")
        }
        .onAppear {
            let url = URL(string: "https://www.hackingwithswift.com/samples/user-messages.json")!

            self.fetch(url, defaultValue: [Message]()) {
                self.messages = $0
            }
        }
    }

    func fetch<T: Decodable>(_ url: URL, defaultValue: T, completion: @escaping (T) -> Void) {

        let decoder = JSONDecoder()

        URLSession.shared.dataTaskPublisher(for: url)
            .retry(1)
            .map(\.data)
            .decode(type: T.self, decoder: decoder)
            .replaceError(with: defaultValue)
            .receive(on: DispatchQueue.main)
            .sink(receiveValue: completion)
            .store(in: &requests)
    }

}

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