objective c - Specific part of code not being executed in iOS -


i retrieving data parse.com , try add image data array. however, code not being executed without obvious reason. code: 

pfquery *userquery = [pfuser query]; [userquery wherekey:@"objectid" containedin:[self.event objectforkey:@"members"]]; [userquery findobjectsinbackgroundwithblock:^(nsarray *users, nserror *error) {     if (!error) {         self.membersarray = [nsmutablearray arraywitharray:users];          [self.tableview reloaddata];          (pfuser *user in self.membersarray) {              [self.memberphotosarray addobject:[nsnull null]];             nsinteger index = [self.memberphotosarray indexofobject:user];              pffile *photofile = [user objectforkey:@"profilepicture"];              [photofile getdatainbackgroundwithblock:^(nsdata *result, nserror *error) {                 if (!error) {                     nslog(@"before creating image");                     uiimage *image = [uiimage imagewithdata:result];                     [self.memberphotosarray[index] addobject:image];                     nslog(@"after creating image");                     [self.tableview reloaddata];                  }             }];          }      } }];

the first log being executed, after line not being called. can explain why , provide solution?

looks code running on background thread. run code in final callback block on main thread. 

if (!error) {      nslog(@"before creating image");          uiimage *image = [uiimage imagewithdata:result];      dispatch_async(dispatch_get_main_queue(), ^{          [self.memberphotosarray[index] addobject:image];          nslog(@"after creating image");          [self.tableview reloaddata];      }); }

ui related operations should performed on main thread.


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