TableView scroll is choppy

i put uiimageviews table view cells , scrolling has been choppy. i'm assuming it's because images being reloaded each time cell appears, how preload/cache images? help.

code:

// customize appearance of table view cells. - (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {          nsstring *cellidentifier = @"cell";          uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil) {         cell = [[[uitableviewcell alloc] initwithframe:cgrectzero reuseidentifier:cellidentifier] autorelease];     }               // set cell... 	nsdictionary *dic = [self.issues objectatindex:indexpath.row];              cell.text = [dic objectforkey:@"date"];          cell.imageview.image = [uiimage imagewithcontentsoffile:[nsstring stringwithformat:@"%@/issues/%@/cover.png", documentsdirectory, [dic objectforkey:@"directory name"]]];          return cell; }  - (cgfloat)tableview:(uitableview *)tableview heightforrowatindexpath:(nsindexpath *)indexpath {              return 150;      }

 

excuse answer, there's complete ios sample application on apple's developer site explain trying do.

hint: uses gcd load images in background, displaying placeholder image.

 

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