ios - Async image loading from url inside a UITableView cell - image changes to wrong image while scrolling? -

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {   static nsstring *cellidentifier = @"cell";      tvcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier forindexpath:indexpath];     if (cell == nil)         cell = [[tvcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];     cell.txtlabel.text = [[[arraydata objectatindex:indexpath.row] valueforkey:@"description"]stringbytrimmingcharactersinset:[nscharacterset whitespaceandnewlinecharacterset]];       cell.imglabel.contentmode = uiviewcontentmodescaleaspectfill;     cell.imglabel.image = nil;      nsurl *url = [nsurl urlwithstring:[nsstring stringwithformat:@"%@",[enclosureurlarray objectatindex:indexpath.row]]];      nsurlsessiontask *task = [[nsurlsession sharedsession] datataskwithurl:url completionhandler:^(nsdata * _nullable data, nsurlresponse * _nullable response, nserror * _nullable error) {         if (data) {             uiimage *image = [uiimage imagewithdata:data];             if (image) {                 dispatch_async(dispatch_get_main_queue(), ^{                         cell.imglabel.image = image;                           [cell.imglabel setimage:image];                           [cell.imglabel.layer setmaskstobounds:yes];                           [cell.imglabel.layer setcornerradius:2.5f];                           [cell setneedslayout];                  });             }         }     }];     [task resume]; 

your problem have no guarantee nsurlrequests terminate in same order started. bad because cells re-used better performance , can end strange behavior.

you can find fix here: asynchronous downloading of images uitableview gcd

or can use tools listed here address issue: https://stackoverflow.com/a/32601838/3769338