ios - Fetching Facebook user data using fbsdk 4.2 -

i beginner in ios development. searched lot didn't code working cause of deprecated class in latest fbsdk 4.2. want integration of fb in apps. able integrate fb in app , can login , logout. app need fetch logged-in user e-mail id , display in label. here code, have tried.

-(void)viewdidload { [super viewdidload]; if ([fbsdkaccesstoken currentaccesstoken]) {     self.loginbutton.readpermissions = @[@"public_profile", @"email", @"user_friends"];        fbsdkgraphrequest *request = [[fbsdkgraphrequest alloc]                                   initwithgraphpath:@"me"                                   parameters:@{@"fields":@"email"}                                   httpmethod:@"get"];     [request startwithcompletionhandler:^(fbsdkgraphrequestconnection *connection,                                           id result,                                           nserror *error) {         if(!error)         {             self.lblemail.text = [result objectforkey:@"email"];             nslog(@"email:%@", result);         }     }];  } 

this working fine me facebook sdk 4.2

if ([fbsdkaccesstoken currentaccesstoken]) {         [[[fbsdkgraphrequest alloc] initwithgraphpath:@"me" parameters:nil] startwithcompletionhandler: ^(fbsdkgraphrequestconnection *connection, id result, nserror *error) {             if (!error)                 nslog(@"%@",result);             else                 nslog(@"%@",error);         }];     } 

hope you.