ios - How will I stop repeating the loading of images in my table view? -


here code displaying images server. after image loaded, when scroll down , back, image disappears , there's delay before it's loaded again.

  dispatch_async(kbgqueue, ^{          nsstring *profileimagestr = [[displayitems objectatindex:indexpath.row] objectforkey:@"image_url"];         nsurl* profileimgurl = [nsurl urlwithstring:profileimagestr];         nsdata *profileimgdata = [nsdata datawithcontentsofurl:profileimgurl];           nsstring *postphotostr = [[displayitems objectatindex:indexpath.row] objectforkey:@"image_url"];         nsurl *postimgurl = [nsurl urlwithstring:postphotostr];         nsdata *postimagedata = [nsdata datawithcontentsofurl:postimgurl];           dispatch_async(dispatch_get_main_queue(), ^{               if (postimagedata && profileimgdata != nil) {                   cell.thumbnailimg.image = [uiimage imagewithdata:profileimgdata];                     cell.bgimgview.image = [uiimage imagewithdata:postimagedata];             }else             {                   cell.thumbnailimg.image = [uiimage imagenamed:@"noimage.jpg"];                     cell.bgimgview.image = [uiimage imagenamed:@"noimage.jpg"];             }          });      }                    );     return cell;

i think need implement cache image. store image in nscache. 

//instance  nscache *imagecache;   - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {      nsstring *simpletableidentifier=nil;     if([objrepresentative.team count]>0)     {         simpletableidentifier=[nsstring stringwithformat:@"%@",[objrepresentative.employeeid objectatindex:indexpath.row]];     }     else         simpletableidentifier = @"contacttablecell";        contacttablecell *cell = (contacttablecell *)[tableview dequeuereusablecellwithidentifier:simpletableidentifier];       if (cell == nil)     {         nsarray *nib = [[nsbundle mainbundle] loadnibnamed:@"contacttablecell" owner:self options:nil];         cell = [nib objectatindex:0];          nsstring *photostring=[nsstring stringwithformat:@"http://www.foo.com/%@",[searchphoto objectatindex:indexpath.row]];              uiimage *image = [imagecache objectforkey:photostring];             if (image)             {                 cell.profilepicture.image=image;             }             else             {                 dispatch_async(dispatch_get_global_queue(dispatch_queue_priority_default, 0), ^{                       nsurl *url = [nsurl urlwithstring:[photostring stringbyaddingpercentescapesusingencoding:nsutf8stringencoding]];                     uiimage *image = [[uiimage alloc] initwithdata:[nsdata datawithcontentsofurl:url]];                      if(image)                     {                         dispatch_async(dispatch_get_main_queue(), ^{                             uiimage *small = [self imagewithimage:image scaledtosize:cgsizemake(100, 100)];                             cell.profilepicture.image=small;                         });                          [imagecache setobject:image forkey:photostring];                     }                     else                         cell.profilepicture.image=[uiimage imagenamed:@"nopicture.png"];                  });             }     } return cell; }

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