how to show data to only visible tableview cells in ios - objective-c

Question

Hi guys i have a custom tableview cell with a scrollview in it.the problem is all the data is getting loaded in tableview cells at once.what i want is to load the data only for the visible cells in tableView.i used [indexPath forvisiblerows]; it was in vain..cud u guys help me out below is the code.
-(IPadTableViewCell *)getNewCell
{
NSArray *topLevelObjects = [[NSBundle mainBundle] loadNibNamed:#"IpadTableViewCell" owner:nil options:nil];
for (id currentObject in topLevelObjects)
{
if ([currentObject isKindOfClass:[IPadTableViewCell class]])
{
cell= (IPadTableViewCell *)currentObject;
return cell;
}
}
return nil;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// static NSString *CellIdentifier = #"IpadTableViewCell";
//cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
id1=[NSString stringWithFormat:#"%i",indexPath.row];
cell=[dicAlbumCells objectForKey:id1];
if (cell == nil) {
cell=[self getNewCell];
}
cell.tag=indexPath.row;
return cell;
}
-(void)loadImagesForOnscreenRows
{
NSArray *visiblePaths = [tblGallery indexPathsForVisibleRows];
for (NSIndexPath *indexPath in visiblePaths) {
if (imageArray > 0) {
[self imageButtonClicked:nil];
}
}
}
- (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate
{
[self loadImagesForOnscreenRows];
}
}
- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView
{
[self loadImagesForOnscreenRows];
}
-(void)imageButtonClicked:(id)sender
{
CGFloat prevButtonXPosition = 18, pageButtonXPosition, pageButtonWidth = 144, pageButtonHeight = 143;
for (NSInteger i =0; i<9; i++) {
pageButtonXPosition = prevButtonXPosition ;
prevButtonXPosition = pageButtonXPosition+pageButtonWidth+20;
UIButton *pageButton = [UIButton buttonWithType:UIButtonTypeCustom];
[pageButton setContentMode:UIViewContentModeScaleAspectFit];
pageButton.layer.borderColor=[[UIColor whiteColor]CGColor];
pageButton.layer.borderWidth = 3;
pageButton.layer.cornerRadius = 0;
[pageButton addTarget:self action:#selector(onClickImage:) forControlEvents:UIControlEventTouchUpInside];
[pageButton setFrame:CGRectMake(pageButtonXPosition,0, pageButtonWidth, pageButtonHeight)];
[pageButton setBackgroundImage:[UIImage imageNamed:[imageArray objectAtIndex:i]] forState:UIControlStateNormal];
[pageButton setTag:i];
[cell.scrollView addSubview:pageButton];
}
UIButton *add=[UIButton buttonWithType:UIButtonTypeCustom];
add.layer.borderColor=[[UIColor whiteColor]CGColor];
add.layer.borderWidth = 3;
add.layer.cornerRadius = 0;
[add addTarget:self action:#selector(onClickAdd:) forControlEvents:UIControlEventTouchUpInside];
[add setFrame:CGRectMake(prevButtonXPosition, 0, 144, 143)];
[add setBackgroundImage:[UIImage imageNamed:#"grey.png"] forState:UIControlStateNormal];
[add setTag:0];
[cell.scrollView addSubview:add];
UIImageView *iv = [[UIImageView alloc] initWithFrame:CGRectMake(prevButtonXPosition+35,30, 76,76)];
[iv setImage:[UIImage imageNamed:#"last.png"]];
[cell.scrollView addSubview:iv];
[cell.scrollView setContentSize:CGSizeMake(prevButtonXPosition +165, 40)];
cell.selectionStyle = UITableViewCellSelectionStyleNone;
[cell.contentView addSubview:cell.scrollView];
}