When people log into your app with Facebook, they can grant permissions to your app so you can retrieve information or perform actions on Facebook on their behalf.
The following steps are for adding Facebook Login to your iOS project.
If you link to the SDKs with CocoaPods, you must update your pods for the SDKs your app uses and recompile your app. You can also download the latest version of the Facebook iOS SDK, integrate it into your app, and recompile.
Set up your development environment before using Facebook Login for iOS.
Using Swift Package Manager (SPM)
import FBSDKCoreKitimport FacebookCoreinfo.plist) with an XML snippet that contains data about your app. info.plist, and choose Open As Source Code. <dict>...</dict>). <array><string> in the key [CFBundleURLSchemes], replace [APP_ID] with your App ID.<string> in the key FacebookAppID, replace [APP_ID] with your App ID.<string> in the key FacebookDisplayName, replace [APP_NAME] with the name of your app.info.plist also needs to include: <dict>...</dict>). <key>LSApplicationQueriesSchemes</key> <array> <string>fbapi</string> <string>fbapi20130214</string> <string>fbapi20130410</string> <string>fbapi20130702</string> <string>fbapi20131010</string> <string>fbapi20131219</string> <string>fbapi20140410</string> <string>fbapi20140116</string> <string>fbapi20150313</string> <string>fbapi20150629</string> <string>fbapi20160328</string> <string>fbauth</string> <string>fb-messenger-share-api</string> <string>fbauth2</string> <string>fbshareextension</string> </array>
AppDelegate.swift with the following code. This code initializes the SDK when your app launches, and allows the SDK handle results from the native Facebook app when you perform a Login or Share action:
// 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
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]
)
}
Use the Facebook Login button in your iOS app.
// Swift
//
// 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)
}
}
// Objective-C
//
// Add this to the header of your file, e.g. in ViewController.m
// after #import "ViewController.h"
#import <FBSDKCoreKit/FBSDKCoreKit.h>
#import <FBSDKLoginKit/FBSDKLoginKit.h>
// Add this to the body
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
FBSDKLoginButton *loginButton = [[FBSDKLoginButton alloc] init];
// Optional: Place the button in the center of your view.
loginButton.center = self.view.center;
[self.view addSubview:loginButton];
}
@end[FBSDKAccessToken currentAccessToken]. FBSDKLoginManager sets this token for you and when it sets currentAccessToken it also automatically writes it to a keychain cache. FBSDKAccessToken contains userID which you can use to identify the user.
// Swift
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.
}
}
readPermissions property on the FBSDKLoginButton object. // Swift // // Extend the code sample from 6a. Add Facebook Login to Your Code // Add to your viewDidLoad method: loginButton.permissions = ["public_profile", "email"]