ios - UITableViewCell preserve selected on UITableView scrolling -

i have uitableview on ipad. when cell selected , cell scrolled off screen, , scrolled screen, selected cell blank. problem occurs on device , not on simulator. have tried various of proposed solutions manage selected index

- (void)tableview:(uitableview *)tableview didselectrowatindexpath:(nsindexpath *)indexpath {     self.selectedindexpath = indexpath; } 

and use setselected/selectrowatindexpath on cellforrowatindexpath like

- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath {     static nsstring *cellidentifier = @"desktop row";     uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:cellidentifier];     if (cell == nil) {         cell =[[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:cellidentifier];     }      ...      if(self.selectedindexpath!=nil){         if ((indexpath.row == self.selectedindexpath.row) && (indexpath.section == self.selectedindexpath.section)) {              [self.tableview selectrowatindexpath:self.selectedindexpath                                         animated:yes                                   scrollposition:uitableviewscrollpositionnone];         }     }      return cell; } 

but nothing works, saw similar questions people ask have different , strage.

any ideas appreciated.