Facebook Login for Swift with facebook iOS SDK 4.9.1 - ios

Question

I got trouble with facebook iOS SDK 4.9.1 on integrating facebook login using swift. and main trouble is unable to find any guideline regarding it for swift.
http://www.brianjcoleman.com/tutorial-how-to-use-login-in-facebook-sdk-4-0-for-swift/
http://swiftdeveloperblog.com/facebook-sdk-ios-login-example-with-swift/
IOS Swift and Facebook SDK
I try to implement below but it doesn't work at all.
class ViewController: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
if (FBSDKAccessToken.currentAccessToken() != nil)
{
// User is already logged in, do work such as go to next view controller.
}
else
{
let loginView : FBSDKLoginButton = FBSDKLoginButton()
self.view.addSubview(loginView)
loginView.center = self.view.center
loginView.readPermissions = ["public_profile", "email", "user_friends"]
loginView.delegate = self
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

This is for viewcontroller :
import FBSDKLoginKit
class ViewController: UIViewController,FBSDKLoginButtonDelegate {
#IBOutlet weak var fbLoginView: FBSDKLoginButton!
override func viewDidLoad() {
super.viewDidLoad()
if(FBSDKAccessToken.currentAccessToken() == nil){
print("Not Logged ")
}
else{
print("Logged In")
}
fbLoginView.readPermissions = ["public_profile","email","user_birthday"]
fbLoginView.delegate = self
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func loginButton(loginButton: FBSDKLoginButton!, didCompleteWithResult result: FBSDKLoginManagerLoginResult!, error: NSError!)
{
if error == nil
{
print("login complete")
let request = FBSDKGraphRequest(graphPath:"me", parameters:["fields":"name,gender,birthday,first_name,last_name,email"])
request.startWithCompletionHandler
{
(connection, result, error) in
if error != nil
{
print ("error \(error)")
}
else if let userData = result as? NSDictionary
{
var frstname = userData["first_name"] as? String
var lastname = userData["last_name"] as? String
var gender = userData["gender"] as? String
var birthday = userData["birthday"] as? String
var email = userData["email"] as? String
print(result)
}
}
}
else
{
print(error.localizedDescription)
}
}
func loginButtonDidLogOut(loginButton: FBSDKLoginButton!)
{
print("user logged out")
}
}

Answer 2

In App Delegate override the following method as :
func application(application: UIApplication,openURL url: NSURL, sourceApplication: String?,annotation: AnyObject) -> Bool
{
return FBSDKApplicationDelegate.sharedInstance().application(application,openURL: url,sourceApplication: sourceApplication,annotation: annotation)
}

Answer 3

Swift 5+
In App Delegate override the following method as :
func application(application: UIApplication,openURL url: NSURL, sourceApplication: String?,annotation: AnyObject) -> Bool
{
return ApplicationDelegate.sharedInstance().application(application,openURL: url,sourceApplication: sourceApplication,annotation: annotation)
}