how can i get user information using facebook sdk 4.1 in ios? -


i'm using pre-built login uibutton of version 2.3 of facebook integration.

problem: getting null result, when fetching user details.

-(void) loginbutton:(fbsdkloginbutton *)loginbutton didcompletewithresult:(fbsdkloginmanagerloginresult *)result error:(nserror *)error {     if ([fbsdkaccesstoken currentaccesstoken]) {              fbsdkgraphrequest *request =[[fbsdkgraphrequest alloc]initwithgraphpath:@"me" parameters:nil];             [request startwithcompletionhandler:^(fbsdkgraphrequestconnection *connection,                                           id result,                                           nserror *error)     {         // handle result         nslog(@"%@",result);     }];      fbsdkprofile *profile = [[fbsdkprofile alloc]init];      } }

try code:

appdelegate.m

- (void)applicationdidbecomeactive:(uiapplication *)application {     [fbsdkappevents activateapp];        //default fb button     [[nsnotificationcenter defaultcenter]postnotificationname:@"getfacebookdata" object:nil]; }  - (bool)application:(uiapplication *)application             openurl:(nsurl *)url   sourceapplication:(nsstring *)sourceapplication          annotation:(id)annotation {     return [[fbsdkapplicationdelegate sharedinstance] application:application                                                           openurl:url                                                 sourceapplication:sourceapplication                                                        annotation:annotation]; }

viewdidload of viewcontroller 

[[nsnotificationcenter defaultcenter]addobserver:self selector:@selector(getfacebookdata) name:@"getfacebookdata" object:nil];   fbsdkloginbutton *loginbutton = [[fbsdkloginbutton alloc] init];  loginbutton.center = self.view.center;  [self.view addsubview:loginbutton];

add method in view controller

- (void)getfacebookdata{     if ([fbsdkaccesstoken currentaccesstoken]) {         [[[fbsdkgraphrequest alloc] initwithgraphpath:@"me" parameters:@{@"fields": @"first_name, last_name, picture.type(large), email, name, id, gender"}]          startwithcompletionhandler:^(fbsdkgraphrequestconnection *connection, id result, nserror *error) {              if (!error) {                  nslog(@"fetched user:%@", result);              }          }];     } }

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