ios - Unable to get Facebook permissions after HTTPMethod DELETE in Swift -

i working on app logs in facebook using fbsdk in swift. have been able make requests wall posts using

var request: fbsdkgraphrequest  request = fbsdkgraphrequest(graphpath: "me/feed"), parameters: ["access_token": fbsdkaccesstoken.currentaccesstoken().tokenstring], httpmethod:"get")  request.startwithcompletionhandler({(connection, result, error) -> void in  if error != nil {  } else {  }  }) 

but have been unable results after used following log out

var deletepermission = fbsdkgraphrequest(graphpath: "me/permissions/", parameters: nil, httpmethod: "delete")  deleterpermission.startwithcompletionhandler({(connection, result, error) -> void in  if error != nil {  } else {  }  }) 

when log in app, again asked accept permissions, when check expiration date current token fbsdkaccesstoken.currentaccesstoken().expirationdate date before tried httpmethod: delete.

so wondering how possible permission app or renew access token because don't think it's working logging in , accepting permissions. have used following log out of app

// log out of database i'm using try! firauth.auth()!.signout()  // log out of facebook, clear current token , logged user fbsdkaccesstoken.setcurrentaccesstoken(nil) fbsdkprofile.setcurrentprofile(nil) 

i using `fbsdkloginbutton()' , setting following permissions log in

var loginbutton = fbsdkloginbutton() loginbutton.readpermissions = ["public_profile", "user_friends", "user_about_me", "user_posts"]  loginbutton.delegate = self  ....  func loginbutton(loginbutton: fbsdkloginbutton!, didcompletewithresult result: fbsdkloginmanagerloginresult!, error: nserror!) {  if error == nil {  let credential = firfacebookauthprovider.credentialwithaccesstoken(fbsdkaccesstoken.currentaccesstoken().tokenstring)  // firebase authentication firauth.auth()?.signinwithcredential(credential) {(user, error) in   if error == nil {     // no error found user credentials through firebase  } else {  }  }} 

but again after logging in , going viewcontroller segue , check current token "me/feed" not getting reply , token's expiration date has expired. easier create new app in facebook developer , set in xcode or there can user posts?