How to get the username from Facebook in Swift - ios

Question

I want to fetch the username of the user in username field into the parse.
I am using loginWithFacebook(withcompletionHandler) and fetchUserInforFromFacebook(withcompletionHandler) to fetch userinfo but I have a problem: These methods create an own object and store in parse username field, but I want to get the user username.
func loginWithFacebook(withcompletionHandler: (success:Bool) ->()){
var permissions : Array = [ "user_location","public_profile"]
PFFacebookUtils.logInInBackgroundWithReadPermissions(permissions, {
(user: PFUser?, error: NSError?) -> Void in
if let user = user {
if user.isNew {
self.fetchUserInforFromFacebook(withcompletionHandler)
println("User SIGNED UP and logged in through Facebook!")
}
withcompletionHandler(success: true)
println("User logged in through Facebook!")
} else {
println("Uh oh. The user cancelled the FACEBOOK LOGIN.")
self.showErrorMessage(error!)
withcompletionHandler(success: false)
}
})
}
func fetchUserInforFromFacebook(withcompletionHandler: (success:Bool) ->()){
if ((FBSDKAccessToken.currentAccessToken()) != nil){
var request = FBSDKGraphRequest(graphPath:"me", parameters:nil)
request.startWithCompletionHandler({connection, result, error in
if error == nil {
//FACEBOOK DATA IN DICTIONARY
var userData = result as NSDictionary
var currentUser : PFUser = PFUser.currentUser()
currentUser.setObject(userData.objectForKey("id") as String, forKey: "faceBookID")
currentUser.setObject( userData.objectForKey("name") as String, forKey: "fullName")
currentUser.email = userData.objectForKey("email") as? String
currentUser.username = userData.objectForKey("email") as? String
var location = userData.objectForKey("location") as? NSDictionary
var locName = location?.objectForKey("name") as? String
if let loc = locName {
var fullNameArr = split(loc) {$0 == ","}
var city: String? = fullNameArr.count > 0 ? fullNameArr[0] : nil
var contry: String? = fullNameArr.count > 1 ? fullNameArr[1]: nil
currentUser.setObject(userData.objectForKey("country"), forKey: "countryName")
currentUser.setObject(userData.objectForKey("city"), forKey: "cityName")
}
currentUser.saveInBackground()
withcompletionHandler(success: true)
}else{
println("Error")
self.showErrorMessage(error)
withcompletionHandler(success: false)
}
})
}
}

Answer 1

FBSession.openActiveSessionWithReadPermissions(["public_profile", "email", "user_friends"] , allowLoginUI: true, completionHandler: { (session:FBSession!, state:FBSessionState, error:NSError!) -> Void in
if (error==nil)
{
FBRequest.requestForMe().startWithCompletionHandler({ (connection:FBRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
if (error==nil)
{
// get All Facebook data from user
//http://graph.facebook.com/67563683055/picture?type=square
//NSLog("%#",result as! NSDictionary)
var bUserFacebookDict = result as! NSDictionary
bstrFirstName = bUserFacebookDict.objectForKey("first_name") as! String
bstrLastName = bUserFacebookDict.objectForKey("last_name") as! String
bstrUserName = bUserFacebookDict.objectForKey("name") as! String
}
else
{
//Utility.showErrorAlert(error.description)
}
})
}
})

Answer 2

Much easier approach to get the username:
Firstly you need to call the FBSession method to get basic profile info and ID of the user.
Secondly Once we get user FB ID, we can directly pass the FB ID in graph API: https://graph.facebook.com/?id=1008223822 aand get the username in the following json format:-
{
"id": "1008223822",
"first_name": "Dj\u00e9",
"gender": "male",
"last_name": "Destolicci",
"link": "https://www.facebook.com/dje.destolicci",
"locale": "fr_FR",
"name": "Dj\u00e9 Destolicci",
"username": "dje.destolicci"
}
Here is code:-
//first do simple login and authenticate user to get basic profile info and FB ID
FBSession.openActiveSessionWithReadPermissions(["public_profile", "email", "user_friends"] , allowLoginUI: true, completionHandler: { (session:FBSession!, state:FBSessionState, error:NSError!) -> Void in
if (error==nil)
{
FBRequest.requestForMe().startWithCompletionHandler({ (connection:FBRequestConnection!, result:AnyObject!, error:NSError!) -> Void in
if (error==nil)
{
var bUserFacebookDict = result as! NSDictionary
let FB_USER_ID = bUserFacebookDict["id"]! as! String
// now call FB graph API to to Get username of the user.
var graphProfileURL = NSURL(string: "https://graph.facebook.com/?id=\(FB_USER_ID)")
var request1: NSURLRequest = NSURLRequest(URL: graphProfileURL!)
var response: AutoreleasingUnsafeMutablePointer<NSURLResponse?
>=nil
var error: NSErrorPointer = nil
var dataVal: NSData = NSURLConnection.sendSynchronousRequest(request1, returningResponse: response, error:nil)!
var err: NSError
println(response)
var jsonResult: NSDictionary = NSJSONSerialization.JSONObjectWithData(dataVal, options: NSJSONReadingOptions.MutableContainers, error: nil) as! NSDictionary
println("Synchronous\(jsonResult)")
let FB_USER_NAME = jsonResult["username"]! as! String //finally you will get username
}
else
{
//Utility.showErrorAlert(error.description)
}
})
}
})