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Peter Friese | Firebase Developer Advocate | @pete rf riese  + Firebase for Apple Developers

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Architecture For Data-Driven Apps Photo by Lance Anderson on Unsplash

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#one-book-a-week-challenge

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Drill-down navigation Three-column layout (iPad / Mac) Single source of truth Driving factors UI always in sync

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UI always in sync

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BookShelfView BookEditView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Book

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Challenge #1 This needs to be a binding But this isn’t a list of bindings

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struct BookShelfView: View { @Binding var bookShelf: BookShelf var body: some View { List { ForEach(Array(bookShelf.books.enumerated()), id: \.element.id) { index, item in BookRowView(book: $bookShelf.books[index]) } .onDelete { indexSet in bookShelf.books.remove(atOffsets: indexSet) } } .navigationTitle(bookShelf.title) } } Solution #1: iterate over enumerated items 🤔

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struct BookShelfView: View { @Binding var bookShelf: BookShelf var body: some View { List { ForEach($bookShelf.books) { $book in BookRowView(book: $book) } .onDelete { indexSet in bookShelf.books.remove(atOffsets: indexSet) } } .navigationTitle(bookShelf.title) } } Solution #1: use list bindings Everything is now bindable

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Learn more h tt ps://pete rf riese.dev/swi ft ui-list-item-bindings-behind-the-scenes/

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How to update only when the user commits? Challenge #2

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struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book dismiss() } } Solution 2: use inner @ObservableObject

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struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book dismiss() } } Solution 2: use inner @ObservableObject

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struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book dismiss() } } Solution 2: use inner @ObservableObject

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struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book dismiss() } } Solution 2: use inner @ObservableObject

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Solution 2

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class BookEditViewModel: ObservableObject { @Published var book: Book @Published var isISBNValid: Bool = true init(book: Book) { self.book = book self.$book .map { checkISBN(isbn: $0.isbn) } .assign(to: &$isISBNValid) } } Solution 2: use inner @ObservableObject Bonus: use Combine to perform validation

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Learn more about Building SwiftUI Components h tt ps://www.youtube.com/c/pete rf riese

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Run with confidence Engage users Develop apps faster

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Run with confidence Crashlytics Performance Monitoring Test Lab App Distribution Engage users Analytics Predictions Cloud Messaging Remote Config A/B Testing Dynamic Links In-app Messaging Develop apps faster Auth Cloud Functions Cloud Firestore Hosting ML Kit Realtime Database Cloud Storage bit.ly/what-is-firebase Extensions Machine Learning

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#protip: Put it beneath Asset.xcasset

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Don’t forget to add to all the targets!

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Swift Package Manager now officially supported! h tt ps://github.com/ fi rebase/ fi rebase-ios-sdk

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🤔

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Application Lifecycle SwiftUI 2 Photo by Thor Alvis on Unsplash

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SwiftUI 2: No more AppDelegate! import SwiftUI @main struct BookShelfApp: App { @StateObject var store = BookShelfStore(shelves: BookShelf.samples) var body: some Scene { WindowGroup { NavigationView { BookShelvesView(store: store) Text("Select a shelf to see its books") Text("Select a book to see its details") } } } }

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SwiftUI 2: No more AppDelegate! import SwiftUI @main struct BookShelfApp: App { @StateObject var store = BookShelfStore(shelves: BookShelf.samples) var body: some Scene { WindowGroup { NavigationView { BookShelvesView(store: store) Text("Select a shelf to see its books") Text("Select a book to see its details") } } } }

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Solution 1: use initialiser import SwiftUI @main struct BookShelfApp: App { @StateObject var store = BookShelfStore(shelves: BookShelf.samples) var body: some Scene { WindowGroup { NavigationView { BookShelvesView(store: store) Text("Select a shelf to see its books") Text("Select a book to see its details") }

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Solution 1: use initialiser import SwiftUI @main struct BookShelfApp: App { @StateObject var store = BookShelfStore(shelves: BookShelf.samples) var body: some Scene { WindowGroup { NavigationView { BookShelvesView(store: store) Text("Select a shelf to see its books") Text("Select a book to see its details") } init() { FirebaseApp.configure() }

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Solution 2: use UIApplicationDelegateAdaptor import SwiftUI import Firebase class AppDelegate: NSObject, UIApplicationDelegate { func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) - > Bool { FirebaseApp.configure() return true } } @main struct BookShelfApp: App { @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

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Solution 2: use UIApplicationDelegateAdaptor import SwiftUI import Firebase class AppDelegate: NSObject, UIApplicationDelegate { func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) - > Bool { FirebaseApp.configure() return true } } @main struct BookShelfApp: App { @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

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Solution 2: use UIApplicationDelegateAdaptor import SwiftUI import Firebase class AppDelegate: NSObject, UIApplicationDelegate { func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) - > Bool { FirebaseApp.configure() return true } } @main struct BookShelfApp: App { @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

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Solution 2: use UIApplicationDelegateAdaptor import SwiftUI import Firebase class AppDelegate: NSObject, UIApplicationDelegate { func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey : Any]? = nil) - > Bool { FirebaseApp.configure() return true } } @main struct BookShelfApp: App { @UIApplicationDelegateAdaptor(AppDelegate.self) var delegate

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Watch the scene phase Handle deep links Continue user activities Do more with the new life cycle

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Watch the scene phase Handle deep links Continue user activities Learn more pete rf riese.dev/ultimate-guide-to-swi ft ui2-application-lifecycle/

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Firestore

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One-Time Fetches Offline Mode Effortless Syncing

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bird_type: airspeed: coconut_capacity: isNative: icon: vector: distances_traveled: "swallow" 42.733 0.62 false { x: 36.4255, y: 25.1442, z: 18.8816 } [42, 39, 12, 42] Document

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Collection Sub-Collection

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Top level collections “books” collection a single book document

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struct Book: Identifiable { var id = UUID().uuidString var shelfId: String? var userId: String? var title: String var author: String var isbn: String var pages: Int var isRead: Bool = false var coverEditionKey: String? } Data Model

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } Can we do better?

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(Yes, we can)

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { if let document = document { let id = document.documentID let data = document.data() let title = data?["title"] as? String ?? "" let numberOfPages = data?["numberOfPages"] as? Int ?? 0 let author = data?["author"] as? String ? ? "" self.book = Book(id:id, title: title, numberOfPages: numberOfPages, author: author) } } } } Fetching a document from Firestore

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }

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func fetchBook(documentId: String) { let docRef = Firestore.firestore().collection("books").document(documentId) docRef.getDocument { document, error in if let error = error as NSError? { print("Error getting document: \(error.localizedDescription)") } else { } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }

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BookShelfView BookEditView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Book Review: Architecture

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BookShelfView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Review: Architecture Snapshot Listener

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot ?. documents else { return } self ?. books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents

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Learn more h tt ps://pete rf riese.dev/ fi restore-codable-the-comprehensive-guide/

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import Foundation import Combine import Firebase import FirebaseFirestoreSwift import os class BookStore: ObservableObject { // MARK: - Dependencies var db = Firestore.firestore() // MARK: - Publishers @Published var user: User? @Published var books = [Book]() // MARK: - Private attributes @Published private var userId: String = "unknown" private var listenerRegistration: ListenerRegistration? private var cancellables = Set() Fetching a collection of documents

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// A Book value could not be initialized from the DocumentSnapshot. switch error { case DecodingError.typeMismatch(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.valueNotFound(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.keyNotFound(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.dataCorrupted(let key): self ? . logger.debug("\(error.localizedDescription): \ (key.debugDescription)") default: self ? . logger.debug("Error decoding document: \ (error.localizedDescription)") } return nil } } } } Fetching a collection of documents

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// A Book value could not be initialized from the DocumentSnapshot. switch error { case DecodingError.typeMismatch(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.valueNotFound(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.keyNotFound(_, let context): self ? . logger.debug("\(error.localizedDescription): \ (context.debugDescription)") case DecodingError.dataCorrupted(let key): self ? . logger.debug("\(error.localizedDescription): \ (key.debugDescription)") default: self ? . logger.debug("Error decoding document: \ (error.localizedDescription)") } return nil } } } } Fetching a collection of documents about 100 lines of code

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struct BookShelfView: View { @FirestoreQuery( collectionPath: "books", predicates: [ .where("userId", isEqualTo: userId), ] ) var books: Result<[Book], Error> @State var userId = "F18EBA5E" var body: some View { List(books) { book in Text(book.title) } } } Firestore Property Wrapper Firebase 8.9.0 @FloWritesCode @mo rt enditlevsen Thanks to

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Authentication Photo by Conve rt Kit on Unsplash

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Authentication Photo by Eduardo Soares on Unsplash

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Authentication Photo by Victor Freitas on Unsplash

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

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Sign in the user Update the data model Secure users’ data How to implement Firebase Authentication?

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Anonymous Authentication “Guest” accounts, rather

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func signIn() { registerStateListener() if Auth.auth().currentUser == nil { Auth.auth().signInAnonymously() } } Anonymous Authentication

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple Firebase SDK

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SignInWithAppleButton( onRequest: { .. . }, onCompletion: { result in ... let appleIDToken = appleIDCredential.identityToken let idTokenString = String(data: appleIDToken, encoding: .utf8) let credential = OAuthProvider.credential(withProviderID: “apple.com", idToken: idTokenString, rawNonce: nonce) Auth.auth().signIn(with: credential) { (authResult, error) in if (error ! = nil) { .. . } print(“User signed in") dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple Firebase SDK

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All books are stored in one single collection Which user do they belong to?

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let query = db.collection("books") .whereField("userId", isEqualTo: self.userId) query .addSnapshotListener { [weak self] (querySnapsho guard let documents = querySnapshot ?. documents els Signed in user

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rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow create: if request.auth != null; allow read, update, delete: if request.auth != null && resource.data.userId = = request.auth.uid; } } } Security Rules Only signed-in users can create new documents Only owners may read and modify a document

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Combine

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auth ?. signInAnonymously() let user = auth ?. currentUser print("User signed in with user ID: \(user ? . uid)") This might be nil

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auth ?. signInAnonymously() let user = auth ?. currentUser print("User signed in with user ID: \(user ? . uid)") auth ?. signInAnonymously { result, error in guard let result = result else { return } print("User signed in with user ID: \(result.user.uid)") } Do this instead

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auth . .. auth ?. signInAnonymously() .map{ $0.user } .replaceError(with: nil) .assign(to: &$user) Even better

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Launching with Firebase 8.9.0 h tt ps://github.com/ fi rebase/ fi rebase-ios-sdk/projects/3

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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async/await Photo by Stephen H on Unsplash

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extension ArticleAnalyser { func process(url: String, completion: @escaping (Article) -> Void) { self.fetchArticle(from: url) { result in switch result { case .failure(let error): print(error.localizedDescription) case .success(let html): self.extractTitle(from: html) { result in switch result { case .failure(let error): print(error.localizedDescription) case .success(let title): self.extractText(from: html) { result in switch result { case .failure(let error): print(error.localizedDescription) case .success(let text): self.extractImage(from: url) { result in Problem: Callback Pyramid of Doom

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extension AsyncArticleAnalyser { func process(url: String) async throws -> Article { let htmlText = try await fetchArticle(from: url) let text = try await extractText(from: htmlText) let title = try await extractTitle(from: htmlText) let imageUrl = try await extractImage(from: url) let tags = await inferTags(from: text) return Article(url: url, title: title, tags: tags, imageUrlString: imageUrl) } } Solution: Use async/await Swift 5.5

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func fetchArticle(from url: String) async throws -> String { guard let url = URL(string: url) else { throw AnalyserError.badURL } return try await withUnsafeThrowingContinuation { continuation in URLSession.shared.downloadTask(with: url) { (localUrl, urlResponse, error) in guard let localUrl = localUrl else { continuation.resume(throwing: AnalyserError.badURL) return } if let htmlText = try? String(contentsOf: localUrl) { continuation.resume(returning: htmlText) } } .resume() } } Solution: Use async/await Swift 5.5

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func fetchArticle(from url: String) async throws -> String { guard let url = URL(string: url) else { throw AnalyserError.badURL } return try await withUnsafeThrowingContinuation { continuation in URLSession.shared.downloadTask(with: url) { (localUrl, urlResponse, error) in guard let localUrl = localUrl else { continuation.resume(throwing: AnalyserError.badURL) return } if let htmlText = try? String(contentsOf: localUrl) { continuation.resume(returning: htmlText) } } .resume() } } Solution: Use async/await Swift 5.5

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func fetchArticle(from url: String) async throws -> String { guard let url = URL(string: url) else { throw AnalyserError.badURL } return try await withUnsafeThrowingContinuation { continuation in URLSession.shared.downloadTask(with: url) { (localUrl, urlResponse, error) in guard let localUrl = localUrl else { continuation.resume(throwing: AnalyserError.badURL) return } if let htmlText = try? String(contentsOf: localUrl) { continuation.resume(returning: htmlText) } } .resume() } } Solution: Use async/await Swift 5.5

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func fetchArticle(from url: String) async throws -> String { guard let url = URL(string: url) else { throw AnalyserError.badURL } return try await withUnsafeThrowingContinuation { continuation in URLSession.shared.downloadTask(with: url) { (localUrl, urlResponse, error) in guard let localUrl = localUrl else { continuation.resume(throwing: AnalyserError.badURL) return } if let htmlText = try? String(contentsOf: localUrl) { continuation.resume(returning: htmlText) } } .resume() } } Solution: Use async/await Swift 5.5

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auth ?. signInAnonymously { result, error in guard let result = result else { return } print("User signed in with user ID: \(result.user.uid)") } do { let result = try await Auth.auth().signIn(withEmail: email, password: password) print("User signed in with user ID: \(result.user.uid)") } catch { print(error) } Works with Firebase, too! Callback-style

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Learn more h tt ps://pete rf riese.dev/async-await-in-swi f h tt ps://www.youtube.com/watch?v=sEKw2BMcQtQ

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Architecture Swi ft UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block

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Register now - it’s free! h tt ps:// fi rebase.google.com/summit

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Thanks! Peter Friese h tt p://pete rf riese.dev @pete rf riese 
 youtube.com/c/PeterFriese/ Follow me h tt ps://github.com/pete rf riese/BookShelf Code

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Credits fi nish by Megan Chown from the Noun Project Time by Nikita Kozin from the Noun Project pipe by Komkrit Noenpoempisut from the Noun Project Passpo rt by ProSymbols from the Noun Project spiral by Alexander Skowalsky from the Noun Project Architecture by Ervin Bolat from the Noun Project Firebase logos cou rt esy h tt ps:// fi rebase.google.com/brand-guidelines Firebase logos cou rt esy h tt ps:// fi rebase.google.com/brand-guidelines Thanks! Hea rt by Roman from the Noun Project

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The End.