Facebook Login for iOS - Quickstart

1. In Xcode, click File > Swift Packages > Add Package Dependency.
2. In the dialog that appears, enter the repository URL: https://github.com/facebook/facebook-ios-sdk⁠
3. In Version, select Up to Next Major and the default option.
4. Complete the prompts to select the libraries you want to use in your project.

   If You Want To	Add This Package to your project
   Allow your app to use the Facebook services	FBSDKCoreKit
   Allow users to log into your app and for your app to ask for permissions to access data	FBSDKLoginKit
   Allow your app to share content on Facebook	FBSDKShareKit
   Allow users to log into your app to enable engagement and promote social features	FBSDKGamingServicesKit

1. Right-click Info.plist, and choose Open As ▸ Source Code.
2. Copy and paste the following XML snippet into the body of your file (<dict>...</dict>).

   <key>CFBundleURLTypes</key>
   <array>
     <dict>
     <key>CFBundleURLSchemes</key>
     <array>
       <string>fbAPP-ID</string>
     </array>
     </dict>
   </array>
   <key>FacebookAppID</key>
   <string>APP-ID</string>
   <key>FacebookClientToken</key>
   <string>CLIENT-TOKEN</string>
   <key>FacebookDisplayName</key>
   <string>APP-NAME</string>
   
3. In <array><string> in the key >[CFBundleURLSchemes], replace APP-ID with your App ID.
4. In <string> in the key FacebookAppID, replace APP-ID with your App ID.
5. In <string> in the key FacebookClientToken, replace CLIENT-TOKEN with the value found under Settings > Advanced > Client Token in your App Dashboard.
6. In <string> in the key FacebookDisplayName, replace APP-NAME with the name of your app.
7. To use any of the Facebook dialogs (e.g., Login, Share, App Invites, etc.) that can perform an app switch to Facebook apps, your application’s Info.plist also needs to include the following:

   <key>LSApplicationQueriesSchemes</key>
   <array>
     <string>fbapi</string>
     <string>fb-messenger-share-api</string>
   </array>
   
   You may directly set the automatic collection of App Events to “true” or “false” by adding FacebookAutoLogAppEventsEnabled as a key in Info.plist.

1. Select the + Capability button in the Signing & Capabilities tab when configuring your app target.
   
2. Find and select the Keychain Sharing capability.
   
3. Ensure that the Keychain Sharing capability is listed for the target.
   

// AppDelegate.swift
import UIKit
import FBSDKCoreKit

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

        return true
    }

    func application(
        _ app: UIApplication,
        open url: URL,
        options: [UIApplication.OpenURLOptionsKey : Any] = [:]
    ) -> Bool {
        ApplicationDelegate.shared.application(
            app,
            open: url,
            sourceApplication: options[UIApplication.OpenURLOptionsKey.sourceApplication] as? String,
            annotation: options[UIApplication.OpenURLOptionsKey.annotation]
        )
    }
}

// SceneDelegate.swift
import FBSDKCoreKit
  ...
func scene(_ scene: UIScene, openURLContexts URLContexts: Set<UIOpenURLContext>) {
    guard let url = URLContexts.first?.url else {
        return
    }

    ApplicationDelegate.shared.application(
        UIApplication.shared,
        open: url,
        sourceApplication: nil,
        annotation: [UIApplication.OpenURLOptionsKey.annotation]
    )
}

// Add this to the header of your file, e.g. in ViewController.swift
import FBSDKLoginKit

// Add this to the body
class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        let loginButton = FBLoginButton()
        loginButton.center = view.center
        view.addSubview(loginButton)
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    if let token = AccessToken.current,
        !token.isExpired {
        // User is logged in, do work such as go to next view controller.
    }
}

// Extend the code sample from 6a. Add Facebook Login to Your Code
// Add to your viewDidLoad method:
loginButton.permissions = ["public_profile", "email"]