objective c - Get info user Facebook SDK iOS -

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i followed little 'guides online, can not figure out how username of user such facebook. login , session work properly. can not take values ​​of current user. working code

 if (!appdelegate.session.isopen) {     // create fresh session object     appdelegate.session = [[fbsession alloc] init];      // if don't have cached token, call open here cause ux login     // occur; don't want happen unless user clicks login button, ,     // check here make sure have token before calling open     if (appdelegate.session.state == fbsessionstatecreatedtokenloaded) {         // though had cached token, need login make session usable         [appdelegate.session openwithcompletionhandler:^(fbsession *session,                                                          fbsessionstate status,                                                          nserror *error) {                nslog(@"session facebook ok");             // how username ?

thanks in advance

learn how use facebook graph api.

to request user info:

[fbrequestconnection startformewithcompletionhandler:^(fbrequestconnection *connection, id result, nserror *error) {    if (!error) {       // success! include code handle results here       nslog(@"user info: %@", result);    }  else {       // error occurred, need handle error       // see: https://developers.facebook.com/docs/ios/errors       } }];

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