xmhafiz

import Combine
import UIKit

class ViewController: UIViewController {
    var viewModel = LoginViewModel()
    var cancellables = Set<AnyCancellable>()
    
    // ...
}

xmhafiz

//
//  ViewController.swift
//

import Combine
import UIKit

class ViewController: UIViewController {
    var viewModel = LoginViewModel()
    var cancellables = Set<AnyCancellable>()

xmhafiz

//
//  ViewController.swift
//

import UIKit

class ViewController: UIViewController {
    // 1
    lazy var stackView: UIStackView = {
        let view = UIStackView()

xmhafiz

//
//  LoginViewModel.swift
//

import Combine
import Foundation

// 1
class LoginViewModel: ObservableObject {
    // 2

xmhafiz

@IBAction func onClickedButton(_ sender: LoaderButton) {
    sender.isLoading = true
    // simulate sending request
    DispatchQueue.main.asyncAfter(deadline: .now() + .seconds(2)) {
        sender.isLoading = false
    }
}

xmhafiz

//
//  LoaderButton.swift
//

import UIKit
// 1
class LoaderButton: UIButton {
    // 2
    var spinner = UIActivityIndicatorView()
    // 3

xmhafiz

import Firebase
import SwiftUI

@main
struct RTDBCodableApp: App {
    init() {
        FirebaseApp.configure()
    }
    
    var body: some Scene {

xmhafiz

struct GameData {
    static var counter = 0
    static var score = 0
    static var wins = 0
    static var lost = 0
}

// usage
// write
GameData.wins = 5

xmhafiz

class ProfileViewController: UIViewController {
    //...
    //...
    
    func broadcastInfo() {
        let image = UIImage() // some image
        let data: [String: Any] = ["title": "...some text", "subtitle": "longer text", "image": image]
        // post a notification
        NotificationCenter.default.post(name: Notification.Name.profileUpdated, object: nil, userInfo: data)
    }

xmhafiz

// 1
extension Notification.Name {
    static let profileUpdated = Notification.Name("OnProfileUpdated")
}

class ViewController: UIViewController {
    //...
    //...
    override func viewDidLoad() {
        super.viewDidLoad()