Facebook Login in Swift 3

facebook login with swift 3

Here is the code for login the Facebook by a UIButton click.

Step 1: Copy this code into your class file:

import UIKit
import FBSDKShareKit
import FBSDKLoginKit
import FBSDKCoreKit

class Facebook_loginPageViewController: UIViewController {

   override func viewDidLoad() {
       super.viewDidLoad()
   }

   override func didReceiveMemoryWarning(){
      super.didReceiveMemoryWarning()
   }

   @IBAction func login(_ sender: Any) {
      self.facebooklogin()
   }

   func facebooklogin() {
      let fbLoginManager : FBSDKLoginManager = FBSDKLoginManager()
      fbLoginManager.logIn(withReadPermissions: ["email"], handler: { (result, error) -> Void in

      print("\n\n result: \(result)")
      print("\n\n Error: \(error)")

      if (error == nil) {
        let fbloginresult : FBSDKLoginManagerLoginResult = result!
        if(fbloginresult.isCancelled) {
           //Show Cancel alert
        } else if(fbloginresult.grantedPermissions.contains("email")) {
            self.returnUserData()
            //fbLoginManager.logOut()
        }
       }
     })
    }

    func returnUserData() {
       let graphRequest : FBSDKGraphRequest = FBSDKGraphRequest(graphPath: "me", parameters: ["fields":"email,name"])
       graphRequest.start(completionHandler: { (connection, result, error) -> Void in
          if ((error) != nil) {
              // Process error
              print("\n\n Error: \(error)")
           } else {
                 let resultDic = result as! NSDictionary
                 print("\n\n  fetched user: \(result)")
                 if (resultDic.value(forKey:"name") != nil) {
                     let userName = resultDic.value(forKey:"name")! as! String as NSString?
                     print("\n User Name is: \(userName)")
                  }

                 if (resultDic.value(forKey:"email") != nil) {
                     let userEmail = resultDic.value(forKey:"email")! as! String as NSString?
                     print("\n User Email is: \(userEmail)")
                  }
             }
        })
     }
}

Step 2: In AppDelegate add the id of Facebook:

import UIKit
import FBSDKShareKit
import FBSDKLoginKit
import FBSDKCoreKit

class AppDelegate: UIResponder, UIApplicationDelegate {

    func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
        let str_URL = url.absoluteString as NSString
        if str_URL.contains("fb1111111111111111")// put you id here {
           return FBSDKApplicationDelegate.sharedInstance().application(
                    app,
                    open: url as URL!,
                    sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
                    annotation: options[UIApplicationOpenURLOptionsKey.annotation])
          }

           return FBSDKApplicationDelegate.sharedInstance().application(
                app,
                open: url as URL!,
                sourceApplication: options[UIApplicationOpenURLOptionsKey.sourceApplication] as! String,
                annotation: options[UIApplicationOpenURLOptionsKey.annotation])

        }
}

Updated Code :App Delegate

func application(_ app: UIApplication, open url: URL, options: [UIApplication.OpenURLOptionsKey : Any] = [:]) -> Bool {
        let str_URL = url.absoluteString as NSString
        if str_URL.contains("fb111111111111111"){
           return FBSDKApplicationDelegate.sharedInstance().application(
                    app,
                    open: url as URL?,
                    sourceApplication: options[UIApplication.OpenURLOptionsKey.sourceApplication] as! String,
                    annotation: options[UIApplication.OpenURLOptionsKey.annotation])
          }

           return FBSDKApplicationDelegate.sharedInstance().application(
                app,
                open: url as URL?,
                sourceApplication: options[UIApplication.OpenURLOptionsKey.sourceApplication] as! String,
                annotation: options[UIApplication.OpenURLOptionsKey.annotation])

        }
}

Step 3: put this code into `info.plist'

<key>CFBundleURLTypes</key>
     <array>
         <dict>
             <key>CFBundleURLSchemes</key>
             <array>
                 <string>fb1111111111111111</string>
             </array>
         </dict>

     </array>
     <key>CFBundleVersion</key>
        <string>2</string>
     <key>FacebookAppID</key>
        <string>1111111111111111</string>
     <key>FacebookDisplayName</key>
        <string>Together Deal</string>
     <key>LSApplicationQueriesSchemes</key>
        <array>
            <string>fbapi</string>
            <string>fb-messenger-api</string>
            <string>fbauth2</string>
            <string>fbshareextension</string>
        </array>

Facebook SDK sign in with Swift 3 iOS 10

You have to substitute didfinishlaunching and openurl AppDelegate methods with below:

public func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool 
{
    return SDKApplicationDelegate.shared.application(application, didFinishLaunchingWithOptions: launchOptions)
}

public func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool 
{
    return SDKApplicationDelegate.shared.application(app, open: url, options: options)
}

Integrating Facebook Login with Parse Swift 3

As stated in the docs, you need to initialize PFFacebookUtils before using it, like so:

func application(_ application: UIApplication,
                 didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey : Any]? = nil) -> Bool {

    // CODE...

    PFFacebookUtils.initializeFacebook(applicationLaunchOptions: launchOptions)
}

Important: Must be done after Parse setup (Parse.initialize...).

After Facebook login return my another application in Swift 3

1. You should not use same facebook id in different app.

2. If you use same facebook id, there will be the same scheme.(Will cause confusion when open your application)

3. If you really want to use same facebook id, you can use webview in your app connected to your server and handle login by server.

---

Related Topics