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Firebase for Apple Developers

This document discusses the architecture and implementation of a data-driven app using SwiftUI and Firebase, focusing on features like authentication, Firestore, and real-time data synchronization. It includes code examples for managing book data with observable objects and asynchronous operations using Combine. The content also covers lifecycle management in SwiftUI 2 and best practices for integrating Firebase into the application.

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Peter Friese | Firebase Developer Advocate | @pete!riese  + Firebase for Apple Developers
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Architecture For Data-Driven Apps Photo by Lance Anderson on Unsplash
#one-book-a-week-challenge
Drill-down navigation Three-column layout (iPad / Mac) Single source of truth Driving factors UI always in sync
UI always in sync
BookShelfView BookEditView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Book
Challenge 1 Sequences are not bindable!
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
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
Challenge 2 How to update only when the user commits?
struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
struct BookEditView: View { @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
Solution 2
class BookEditViewModel: ObservableObject { @Published var book: Book @Published var isISBNValid: Bool = true init(book: Book) { self.book = book self.$book .map { checkISBN(isbn: $0.isbn) } .assign(to: &$isISBNValid) } } Solution 2: use inner @ObserverableObject Bonus: use Combine to perform validation
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Run with confidence Engage users Develop apps faster
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
#protip: Put it beneath Asset.xcasset
Don’t forget to add to all the targets!
Swift Package Manager now officially supported! h"ps://github.com/#rebase/#rebase-ios-sdk
!
Application Lifecycle SwiftUI 2 Photo by Thor Alvis on Unsplash
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") } } } }
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") } } } }
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") }
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() }
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
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
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
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
Watch the scene phase Handle deep links Continue user activities Do more with the new life cycle
Watch the scene phase Handle deep links Continue user activities Learn more pete$riese.dev/ultimate-guide-to-swi!ui2-application-lifecycle/
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Firestore
One-Time Fetches Offline Mode Effortless Syncing
bird_type: airspeed: coconut_capacity: isNative: icon: vector: distances_traveled: "swallow" 42.733 0.62 false <binary data> {x: 36.4255, y: 25.1442, z: 18.8816} [42, 39, 12, 42] Document
Collection Sub-Collection
Top level collections “books” collection a single book document
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
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
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
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
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
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
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
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 Can we do better?
(Yes, we can)
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
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) } } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }
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) } } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }
BookShelfView BookEditView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Book Review: Architecture
BookShelfView BookDetailsView BookRowView Source of Truth books: [Book] @ObservableObject @Binding Book Book Review: Architecture Snapshot Listener
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!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
class BookStore: ObservableObject { var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
Learn more h"ps://pete$riese.dev/#restore-codable-the-comprehensive-guide/
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Authentication Photo by Conve"Kit on Unsplash
Authentication Photo by Eduardo Soares on Unsplash
Authentication Photo by Victor Freitas on Unsplash

Sign in the user Update the data model Secure users’ data How to implement Firebase Authentication?
Anonymous Authentication “Guest” accounts, rather
func signIn() { registerStateListener() if Auth.auth().currentUser !% nil { Auth.auth().signInAnonymously() } } Anonymous Authentication
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
All books are stored in one single collection Which user do they belong to?
let query = db.collection("books") .whereField("userId", isEqualTo: self.userId) query .addSnapshotListener { [weak self] (querySnapsho guard let documents = querySnapshot!$documents els Signed in user
rules_version = '2'; service cloud.firestore { match /databases/{database}/documents { match /{document=**} { allow create: if request.auth !' null; allow read, update, delete: if request.auth !' null !( resource.data.userId !% request.auth.uid; } } } Security Rules Only signed-in users can create new documents Only owners may read and modify a document
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Combine
auth!$signInAnonymously() let user = auth!$currentUser print("User signed in with user ID: (user!$uid)") This might be nil
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
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)") } @Published var user: User? !!& auth!$signInAnonymously() .map{ $0.user } .replaceError(with: nil) .assign(to: &$user) Even better
Follow the project for updates h"ps://github.com/#rebase/#rebase-ios-sdk/projects/3
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
async/await Photo by Stephen H on Unsplash
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
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 Probably in Swift 5.5
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 Probably in Swift 5.5
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 Probably in Swift 5.5
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 Probably in Swift 5.5
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 Probably in Swift 5.5
auth!$signInAnonymously { result, error in guard let result = result else { return } print("User signed in with user ID: (result.user.uid)") } do { let result = try await Auth.auth().signIn(withEmail: email, password: password) print("User signed in with user ID: (result.user.uid)") } catch { print(error) } Works with Firebase, too! Callback-style
Learn more h"ps://pete$riese.dev/async-await-in-swi! h"ps://www.youtube.com/watch?v=sEKw2BMcQtQ
Architecture Swi!UI 2 Life Cycle Firebase Firestore Authentication Combine async/await Completion block
Thanks! Peter Friese h"p://pete$riese.dev @pete$riese youtube.com/c/PeterFriese/ Follow me
Credits #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% 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%esy h"ps://#rebase.google.com/brand-guidelines Firebase logos cou%esy h"ps://#rebase.google.com/brand-guidelines Thanks! Hea% by Roman from the Noun Project
The End.

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Firebase for Apple Developers

  • 1.
    Peter Friese |Firebase Developer Advocate | @pete!riese  + Firebase for Apple Developers
  • 2.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 3.
    Architecture For Data-Driven Apps Photoby Lance Anderson on Unsplash
  • 4.
  • 6.
    Drill-down navigation Three-column layout(iPad / Mac) Single source of truth Driving factors UI always in sync
  • 7.
  • 8.
  • 9.
  • 10.
    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
  • 11.
    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
  • 12.
    Challenge 2 How toupdate only when the user commits?
  • 13.
    struct BookEditView: View{ @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
  • 14.
    struct BookEditView: View{ @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
  • 15.
    struct BookEditView: View{ @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { 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 presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
  • 16.
    struct BookEditView: View{ @Binding var book: Book @ObservedObject var bookEditViewModel: BookEditViewModel init(book: Binding<Book>) { self._book = book self.bookEditViewModel = BookEditViewModel(book: book.wrappedValue) } var body: some View { TextField("Book title", text: $bookEditViewModel.book.title) } func save() { self.book = bookEditViewModel.book presentationMode.wrappedValue.dismiss() } } Solution 2: use inner @ObserverableObject
  • 17.
  • 18.
    class BookEditViewModel: ObservableObject{ @Published var book: Book @Published var isISBNValid: Bool = true init(book: Book) { self.book = book self.$book .map { checkISBN(isbn: $0.isbn) } .assign(to: &$isISBNValid) } } Solution 2: use inner @ObserverableObject Bonus: use Combine to perform validation
  • 19.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 21.
    Run with confidenceEngage users Develop apps faster
  • 22.
    Run with confidence Crashlytics Performance Monitoring TestLab 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
  • 26.
  • 27.
    Don’t forget toadd to all the targets!
  • 28.
    Swift Package Manager nowofficially supported! h"ps://github.com/#rebase/#rebase-ios-sdk
  • 29.
  • 30.
    Application Lifecycle SwiftUI 2 Photoby Thor Alvis on Unsplash
  • 31.
    SwiftUI 2: Nomore 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") } } } }
  • 32.
    SwiftUI 2: Nomore 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") } } } }
  • 33.
    Solution 1: useinitialiser 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") }
  • 34.
    Solution 1: useinitialiser 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() }
  • 35.
    Solution 2: useUIApplicationDelegateAdaptor 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
  • 36.
    Solution 2: useUIApplicationDelegateAdaptor 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
  • 37.
    Solution 2: useUIApplicationDelegateAdaptor 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
  • 38.
    Solution 2: useUIApplicationDelegateAdaptor 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
  • 39.
    Watch the scenephase Handle deep links Continue user activities Do more with the new life cycle
  • 40.
    Watch the scenephase Handle deep links Continue user activities Learn more pete$riese.dev/ultimate-guide-to-swi!ui2-application-lifecycle/
  • 41.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 42.
  • 45.
  • 46.
  • 47.
  • 48.
  • 49.
    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
  • 50.
    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
  • 51.
    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
  • 52.
    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
  • 53.
    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
  • 54.
    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
  • 55.
    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
  • 56.
    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 Can we do better?
  • 57.
  • 58.
    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
  • 59.
    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) } } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }
  • 60.
    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) } } } } Mapping data using Codable if let document = document { do { self.book = try document.data(as: Book.self) } catch { print(error) } }
  • 61.
    BookShelfView BookEditView BookDetailsView BookRowView Source of Truth books:[Book] @ObservableObject @Binding Book Book Book Review: Architecture
  • 62.
    BookShelfView BookDetailsView BookRowView Source of Truth books:[Book] @ObservableObject @Binding Book Book Review: Architecture Snapshot Listener
  • 63.
    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!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 64.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 65.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 66.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 67.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 68.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$documents else { return } self!$books = documents.compactMap { queryDocumentSnapshot in let result = Result { try queryDocumentSnapshot.data(as: Book.self) } switch result { case .success(let book): if let book = book { return book Fetching a collection of documents
  • 69.
    class BookStore: ObservableObject{ var db = Firestore.firestore() private var listenerRegistration: ListenerRegistration? @Published var books = [Book]() func subscribe() { listenerRegistration = db.collection("books") .addSnapshotListener { [weak self] (querySnapshot, error) in guard let documents = querySnapshot!$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
  • 71.
  • 72.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 73.
  • 74.
  • 75.
    Authentication Photo by VictorFreitas on Unsplash
  • 76.
  • 77.
    Sign in theuser Update the data model Secure users’ data How to implement Firebase Authentication?
  • 78.
  • 79.
    func signIn() { registerStateListener() ifAuth.auth().currentUser !% nil { Auth.auth().signInAnonymously() } } Anonymous Authentication
  • 81.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 82.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 83.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 84.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 85.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 86.
    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) { !!& } self.presentationMode.wrappedValue.dismiss() } } ).frame(width: 280, height: 45, alignment: .center) Sign in with Apple
  • 87.
    All books arestored in one single collection Which user do they belong to?
  • 88.
    let query =db.collection("books") .whereField("userId", isEqualTo: self.userId) query .addSnapshotListener { [weak self] (querySnapsho guard let documents = querySnapshot!$documents els Signed in user
  • 89.
    rules_version = '2'; servicecloud.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
  • 90.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 91.
  • 92.
    auth!$signInAnonymously() let user =auth!$currentUser print("User signed in with user ID: (user!$uid)") This might be nil
  • 93.
    auth!$signInAnonymously() let user =auth!$currentUser print("User signed in with user ID: (user!$uid)") auth!$signInAnonymously { result, error in guard let result = result else { return } print("User signed in with user ID: (result.user.uid)") } Do this instead
  • 94.
    auth!$signInAnonymously() let user =auth!$currentUser print("User signed in with user ID: (user!$uid)") auth!$signInAnonymously { result, error in guard let result = result else { return } print("User signed in with user ID: (result.user.uid)") } @Published var user: User? !!& auth!$signInAnonymously() .map{ $0.user } .replaceError(with: nil) .assign(to: &$user) Even better
  • 95.
    Follow the projectfor updates h"ps://github.com/#rebase/#rebase-ios-sdk/projects/3
  • 96.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 97.
  • 98.
    extension ArticleAnalyser { funcprocess(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
  • 99.
    extension AsyncArticleAnalyser { funcprocess(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 Probably in Swift 5.5
  • 100.
    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 Probably in Swift 5.5
  • 101.
    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 Probably in Swift 5.5
  • 102.
    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 Probably in Swift 5.5
  • 103.
    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 Probably in Swift 5.5
  • 104.
    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
  • 105.
  • 106.
    Architecture Swi!UI 2Life Cycle Firebase Firestore Authentication Combine async/await Completion block
  • 107.
  • 108.
    Credits #nish by MeganChown from the Noun Project Time by Nikita Kozin from the Noun Project pipe by Komkrit Noenpoempisut from the Noun Project Passpo% 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%esy h"ps://#rebase.google.com/brand-guidelines Firebase logos cou%esy h"ps://#rebase.google.com/brand-guidelines Thanks! Hea% by Roman from the Noun Project
  • 109.