objective c - iOS-Parse How to retrieve an object given a username? -

i have 2 viewcontrollers, in first one, there 3 key-value pairs in each pfobject, save them parse after clicking button. in second viewcontroller, want create property , save same pfobject. here code:

in first viewcontroller:

- (void)next {     pfobject *thisuser = [pfobject objectwithclassname:@"user"];     thisuser[@"name"] = [pfuser currentuser].username;     thisuser[@"institution"] = institution.text;     thisuser[@"major"] = major.text;     [thisuser saveinbackgroundwithblock:^(bool succeeded, nserror *error)     {         if (succeeded)         {             guideviewcontroller2 *gvc2 = [[guideviewcontroller2  alloc]initwithnibname:@"guideviewcontroller2" bundle:nil];             uinavigationcontroller *nav = [[uinavigationcontroller alloc]initwithrootviewcontroller:gvc2];             nav.modalpresentationstyle = uimodalpresentationfullscreen;             nav.modaltransitionstyle = uimodaltransitionstylefliphorizontal;             [self presentviewcontroller:nav animated:yes completion:nil];              nslog(@"success");         }         else         {             nslog(@"nope");         }     }]; } 

and in second view controller, user can upload profile photo, want photo saved in same pfobject. there way retrieve object using [pfuser currentuser].username property? how user object under user class in order add photo key-value pair?

thx.

you can query user:

pfquery *query = [pfuser query]; [query wherekey:username_key equalto:username]; [query getfirstobjectinbackgroundwithblock:^(pfobject *object, nserror *error) {      if (!error) {        //you found user!        pfuser *querieduser = (pfuser *)object;     }  }]; 

supposing username unique! username_key username field , username actual username.