ios - Facebook Login without FBSDKLoginButton in Swift -

i trying add facebook login app. using fbsdkloginbutton comes own button , once login turns logout. don't want that. need add own button view. , in button's @ibaction want facebook login take place. code using is

class viewcontroller: uiviewcontroller,fbsdkloginbuttondelegate {      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.          if (fbsdkaccesstoken.currentaccesstoken() != nil)         {             // user logged in, work such go 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         }      }       func loginbutton(loginbutton: fbsdkloginbutton!, didcompletewithresult result: fbsdkloginmanagerloginresult!, error: nserror!) {         println("user logged in")          if ((error) != nil)         {             // process error         }         else if result.iscancelled {             // handle cancellations         }         else {             returnuserdata()             // if ask multiple permissions @ once,             // should check if specific permissions missing             if result.grantedpermissions.contains("email")             {                 // work             }         }     }      func loginbuttondidlogout(loginbutton: fbsdkloginbutton!) {         println("user logged out")     }      func returnuserdata()     {         let graphrequest : fbsdkgraphrequest = fbsdkgraphrequest(graphpath: "me", parameters: nil)         graphrequest.startwithcompletionhandler({ (connection, result, error) -> void in              if ((error) != nil)             {                 // process error                 println("error: \(error)")             }             else             {                 println("fetched user: \(result)")                 let username : nsstring = result.valueforkey("name") as! nsstring                 println("user name is: \(username)")                 let useremail : nsstring = result.valueforkey("email") as! nsstring                 println("user email is: \(useremail)")             }         })      }       override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }   } 

how customise , achieve need. in advance.

fbsdkloginmanager can used if fb login handled via custom button.

for more info, can check this.