Skip to content
Last updated

iOS Swift quickstart

This guide is a walkthrough on how to integrate Frontegg’s authentication magic into your app using the Frontegg Swift SDK. Whether you need to add secure sign-ups, logins, multi-factor authentication, or even social logins, this guide has you covered with simple, step-by-step instructions to get things rolling in no time.


Check out the sample package on GitHub


Prerequisites

Frontegg Hosted Login is required, and setting a custom domain is highly recommended.
iOS ≥ 14
Swift ≥ 5.3


Prepare Frontegg workspace

Navigate to Frontegg Portal Settings, If you don't have an application, follow integration steps after signing up.

Copy FronteggDomain for future steps from Frontegg Portal Domain:


frontegg-domain

Setup hosted login

  • Navigate to Login Method Settings

  • Toggle on Hosted login method

  • Add {{IOS_BUNDLE_IDENTIFIER}}://{{FRONTEGG_BASE_URL}}/ios/oauth/callback

  • Replace IOS_BUNDLE_IDENTIFIER with your application identifier

  • Replace FRONTEGG_BASE_URL with your frontegg base url, without https, i.e FronteggDomain

Add Frontegg package to the project

  • Open you project
  • Choose File -> Add Packages
  • Enter https://github.com/frontegg/frontegg-ios-swift in search field
  • Press Add Package

Create Frontegg Plist file

To setup your SwiftUI application to communicate with Frontegg, you have to create a new file named Frontegg.plist
under your root project directory, this file will store values to be used variables by Frontegg SDK:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN">
<plist version="1.0">
    <dict>
        <key>baseUrl</key>
        <string>https://[DOMAIN_HOST_FROM_PREVIOUS_STEP]</string>
        <key>clientId</key>
        <string>[CLIENT_ID_FROM_PREVIOUS_STEP]</string>
    </dict>
</plist>

Multi-apps support

Prerequisites

The use of this feature requires @frontegg/ios-swift@1.2.16


This guide outlines the steps to configure your iOS application to support multiple applications.

Add applicationId to Frontegg.plist file:

<plist version="1.0">
  <dict>
    <key>applicationId</key>  
    <string>your-application-id-uuid</string>
    <key>baseUrl</key>
    <string>https://your-domain.fronteg.com</string>
    <key>clientId</key>
    <string>your-client-id-uuid</string>
  </dict>
</plist>

Embedded webview vs ASWebAuthenticationSession

@frontegg/swift SDK supports two authentication methods:

  • Embedded Webview
  • ASWebAuthenticationSession

By default Frontegg SDK will use Embedded Webview, to use ASWebAuthenticationSession you have to set embeddedMode to NO in Frontegg.plist file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN">
<plist version="1.0">
    <dict>
        <key>baseUrl</key>
        <string>https://[DOMAIN_HOST_FROM_PREVIOUS_STEP]</string>
        <key>clientId</key>
        <string>[CLIENT_ID_FROM_PREVIOUS_STEP]</string>

        <!-- START -->
        <key>embeddedMode</key>
        <true/>
        <!-- END -->
    </dict>
</plist>

Configure iOS associated domain

Configuring your iOS associated domain is required for Magic Link authentication / Reset Password / Activate Account.

In order to add your iOS associated domain to your Frontegg application, you will need to update in each of your
integrated Frontegg Environments the iOS associated domain that you would like to use with that Environment. Send a POST request to https://api.frontegg.com/vendors/resources/associated-domains/v1/ios with the following payload:

{
    "appId":[YOUR_ASSOCIATED_DOMAIN]
}

In order to use our API’s, follow [this guide] to generate a vendor token.

Next, you will need to add your associated domain to your iOS application. To do so, follow the steps below:

  1. Open your project in Xcode.
  2. Select your project in the Project Navigator.
  3. Select your target.
  4. Select the Signing & Capabilities tab.
  5. Expand the Associated Domains section.
  6. Click the + button.
  7. Enter your associated domain in the format applinks:[YOUR_ASSOCIATED_DOMAIN].
  8. Enter your associated domain in the format webcredentials:[YOUR_ASSOCIATED_DOMAIN].
  9. Click Done.

[YOUR_ASSOCIATED_DOMAIN] is the associated domain that you would like to use with your iOS application.
For example, if you would like to use https://example.com as your associated domain, you would
enter applinks:example.com and webcredentials:example.com.


Multi-region support

This guide outlines the steps to configure your iOS application to support multiple regions.

  1. Modify the Frontegg.plist File - adjust your Frontegg.plist file to handle multiple regions:

Modifications:

  • Remove the existing baseUrl and clientId keys.
  • Add a new array key named regions. This array will hold dictionaries for each region.

Example Frontegg.plist Structure:

<key>regions</key>
<array>
<dict>
    <key>key</key>
    <string>us-region</string>
    <key>baseUrl</key>
    <string>https://us-region-api.frontegg.com</string>
    <key>clientId</key>
    <string>your-client-id-for-us-region</string>
</dict>
<!-- Add additional regions in a similar format -->
</array>

  1. Add Associated domains for each region For each region, configure the associated domains in your application's settings. This is vital for proper API routing
    and authentication.

Follow Configure iOS associated domain to add your iOS associated domain to your Frontegg application.

  1. Implement Region Selection UI

The final step is to implement a UI for the user to select their region. This can be done in any way you see fit.
The example application uses a simple picker view to allow the user to select their region.

Important considerations

  • Switching regions: To switch regions, update the selection in UserDefaults. If issues arise, a re-installation
    of the application might be necessary.
  • Data isolation: Ensure data handling and APIs are region-specific to prevent data leakage between regions.
Select EU RegionSelect US Region
eu-region-example.gifus-region-example.gif

Example region selection UI:

import SwiftUI
import FronteggSwift

struct SelectRegionView: View {
    @EnvironmentObject var fronteggAuth: FronteggAuth
    
    var body: some View {
        VStack(alignment: .leading) {
            Text("Welcome to MyApp")
                .font(.largeTitle)
            
            Text("Select your region:")
                .padding(.top, 8)
                .padding(.bottom, 20)
                .font(.title2)
            
            
            ForEach(fronteggAuth.regionData, id: \.key.self) { item in
                Button(action: {
                    FronteggApp.shared.initWithRegion(regionKey: item.key)
                }) {
                    VStack(alignment: .leading) {
                        Text("Region - \(item.key.uppercased())")
                            .font(.title2)
                            .padding(.bottom, 1)
                        Text("\(item.baseUrl)")
                            .font(.caption)
                            .tint(.black)
                            .padding(.bottom, 8)
                    }
                }
                .frame(maxWidth: .infinity, alignment: .leading)
                .contentShape(Rectangle())
            }
            
            Spacer()
            
        }
        .padding()
        .navigationTitle("Region")
    }
}

SwiftUI and UIKit integration

Add Frontegg wrapper

To use Frontegg SDK you have to wrap you Application Scene with FronteggWrapper

import SwiftUI
    import FronteggSwift

    @main
    struct demoApp: App {
        var body: some Scene {
            WindowGroup {
                FronteggWrapper {
                    MyApp()
                }
            }
        }
    }

Modify MyApp.swift file to render content if user is authenticated:

  1. Add @EnvironmentObject var fronteggAuth: FronteggAuth to
  2. Render your entire application based on fronteggAuth.isAuthenticated
struct MyApp: View {
      @EnvironmentObject var fronteggAuth: FronteggAuth
      
      var body: some View {
        ZStack {
          if fronteggAuth.isAuthenticated {
            [YOU APPLICATION TABS / ROUTER / VIEWS]
          } else  {
            
            Button {
                fronteggAuth.login()
            } label: {
                Text("Login Button")
            }
          }
        }
      }
    }

SwiftUI - add sustom loading screen

To use your own LoadingView / SplashScreen:

  • Build your loading view in separated file
  • Pass LoadingView as AnyView to the FronteggWrapper
FronteggWrapper(loaderView: AnyView(LoaderView())) {
      MyApp()
    }

UIKit - Frontegg UIKit wrapper

  1. Add Frontegg to the AppDelegate file
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions:     
        [UIApplication. LaunchOptionsKey: Any]?) -> Bool {
          // Override point for customization after application launch.

          FronteggApp.shared.didFinishLaunchingWithOptions()
        
          return true
    }

  1. Create AuthenticationController class that extends AbstractFronteggController from FronteggSwift
    //  AuthenticationController.swift
      
      import UIKit
      import FronteggSwift
      
      class AuthenticationController: AbstractFronteggController {
      
          override func navigateToAuthenticated(){
              // This function will be called when the user is authenticated
              // to navigate your application to the authenticated screen
              
              let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
              
              // TODO: Set Storyboard ID 'authenticatedScreen' for your authenticated screen
              let viewController = mainStoryboard.instantiateViewController(withIdentifier: "authenticatedScreen")
              self.view.window?.rootViewController = viewController
              self.view.window?.makeKeyAndVisible()
          }
      
      }

  1. Create a new ViewController for AuthenticationController:
    • Change viewController's class to AuthenticationController
    • Set Storyboard ID to fronteggController
    • Make sure that the view controller is the initial view controller

frontegg-domain

  1. Setup SceneDelegate for Frontegg universal links:

func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
          if let url = URLContexts.first?.url,
              url.startAccessingSecurityScopedResource() {
              defer  {
                  url.stopAccessingSecurityScopedResource()
              }
              if url.absoluteString.hasPrefix( FronteggApp.shared.baseUrl ) {
                  if(FronteggApp.shared.auth.handleOpenUrl(url)){
                      // Display your own Authentication View Controller
                      // to handle after oauth callback
                      window?.rootViewController = AuthenticationController()
                      window?.makeKeyAndVisible()
                      return
                  }
              }
              
          }
      }
      func scene(_ scene: UIScene, continue userActivity: NSUserActivity) {
          if let url = userActivity.webpageURL {
              if(FronteggApp.shared.auth.handleOpenUrl(url)){
                  // Display your own Authentication View Controller
                  // to handle after oauth callback
                  window?.rootViewController = AuthenticationController()
                  window?.makeKeyAndVisible()
                  return
              }
          }
      }

  1. Access authenticated user by FronteggApp.shared.auth:
//  ExampleViewController.swift
      
      import UIKit
      import FronteggSwift
      
      class ExampleViewController: UIViewController {
      
          // Label to display logged in user's email
          @IBOutlet weak var label: UILabel!
          var showLoader: Boolean = true
          
          override func viewDidLoad() {
              super.viewDidLoad()
              // Do any additional setup after loading the view.
              
              // subscribe to isAuthenticated and navigate to login page
              // if the user is not authenticated

              let fronteggAuth = FronteggApp.shared.auth
              self.label.text = fronteggAuth.user?.email ?? "Unknown"
          }
           
          @IBAction func logoutButton (){
              FronteggApp.shared.auth.logout() { _ in
                  window?.rootViewController = AuthenticationController()
                  window?.makeKeyAndVisible()  
              }
          }

      }

Login with ASWebAuthenticationSession

Starting from version 1.2.9, the Frontegg SDK has introduced support for ASWebAuthenticationSession, enhancing the login experience. This new feature allows for a more streamlined and secure authentication process.

A loginWithPopup method has added with parameters to accommodate the integration of ASWebAuthenticationSession:

  • window: Specifies the window where the login view controller will be presented. If this parameter is not provided,
    the SDK will default to using the key window.
  • ephemeralSession: A Boolean flag indicating if the session should be ephemeral. By default, this is set to true.
  • loginHint: An optional parameter for the login hint to be used during the login process. It is nil by default.
  • loginAction: An optional parameter that defines the login action to be used. It also defaults to nil.
  • completion: A completion handler that is called once the login process concludes.

Below are examples demonstrating how to utilize ASWebAuthenticationSession with the Frontegg SDK in both UIKit and SwiftUI applications.

UIKit implementation

For developers using UIKit, the login process can be initiated as follows:

import UIKit
import FronteggSwift

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

    @IBAction func loginButtonTapped() {
        FronteggAuth.shared.loginWithPopup(window: self.view.window) { result in
            switch result {
            case .success(let user):
                print("User logged in: \(user)")
            case .failure(let error):
                print("Error logging in: \(error)")
            }
        }
    }
}

SwiftUI implementation

For those preferring SwiftUI, the integration is similarly straightforward:

import SwiftUI
import FronteggSwift

struct ContentView: View {
    @EnvironmentObject var fronteggAuth: FronteggAuth
    
    var body: some View {
        VStack {
            if fronteggAuth.isAuthenticated {
                Text("User Authenticated")
            } else {
                Button("Login") {
                    fronteggAuth.loginWithPopup()
                }
            }
        }
    }
}

import SwiftUI
import FronteggSwift

struct ContentView: View {
    @EnvironmentObject var fronteggAuth: FronteggAuth
    
    var body: some View {
        VStack {
            if fronteggAuth.isAuthenticated {
                Text("User Authenticated")
            } else {
                Button("Login") {
                    fronteggAuth.loginWithPopup()
                }
            }
        }
    }
}