Networking

sample.swift

//
//  AppDelegate.swift
//  GithubInfo
//
//  Created by Chris Eidhof on 25.06.19.
//  Copyright © 2019 Chris Eidhof. All rights reserved.
//

import UIKit
import SwiftUI
import Combine
import TinyNetworking

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        return true
    }

    func application(_ application: UIApplication, configurationForConnecting connectingSceneSession: UISceneSession, options: UIScene.ConnectionOptions) -> UISceneConfiguration {
        return UISceneConfiguration(name: "Default Configuration", sessionRole: connectingSceneSession.role)
    }
}

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
    var window: UIWindow?
    func scene(_ scene: UIScene, willConnectTo session: UISceneSession, options connectionOptions: UIScene.ConnectionOptions) {
        if let windowScene = scene as? UIWindowScene {
            let window = UIWindow(windowScene: windowScene)
            window.rootViewController = UIHostingController(rootView: ContentView())
            self.window = window
            window.makeKeyAndVisible()
        }
    }
}

struct User: Codable {
    var name: String
    var location: String?
}

func userInfo(login: String) -> Endpoint<User> {
    return Endpoint(json: .get, url: URL(string: "https://api.github.com/users/\(login)")!)
}


final class Resource<A>: BindableObject {
    let didChange = PassthroughSubject<A?, Never>()
    let endpoint: Endpoint<A>
    var value: A? {
        didSet {
            DispatchQueue.main.async {
                self.didChange.send(self.value)
            }
        }
    }
    init(endpoint: Endpoint<A>) {
        self.endpoint = endpoint
        reload()
    }
    func reload() {
        URLSession.shared.load(endpoint) { result in
            self.value = try? result.get()
        }
    }
}


struct ContentView : View {
    @ObjectBinding var user = Resource(endpoint: userInfo(login: "objcio"))
    var body: some View {
        Group {
            if user.value == nil {
                Text("Loading...")
            } else {
                VStack {
                    Text(user.value!.name).bold()
                    Text(user.value!.location ?? "")
                }
            }
        }
    }
}

#if DEBUG
struct ContentView_Previews : PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}
#endif