ios - How to get the username from Facebook in Swift -


i want fetch username of user in username field parse.

i using loginwithfacebook(withcompletionhandler) , fetchuserinforfromfacebook(withcompletionhandler) fetch userinfo have problem: these methods create own object , store in parse username field, want 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 , logged in through facebook!")                 }             withcompletionhandler(success: true)             println("user logged in through facebook!")          } else {             println("uh oh. user cancelled 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 nsdictionary                 var currentuser : pfuser = pfuser.currentuser()                 currentuser.setobject(userdata.objectforkey("id") string, forkey: "facebookid")                 currentuser.setobject( userdata.objectforkey("name") 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)             }         })       }  }

much easier approach username:

firstly you need call fbsession method basic profile info , id of user.

secondly once user fb id, can directly pass fb id in graph api: https://graph.facebook.com/?id=1008223822 aand username in 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 code:- 

//first simple login , authenticate user basic profile info , 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                          // call fb graph api to username of 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 username                       }                     else                     {                         //utility.showerroralert(error.description)                     }                 })             }         })

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