IPhone : Maintain state of custom button in UITableview cell when scrolls

I know this question is very similar to other questions, but i doesn't resolve the problem using that approach.i follow most of the available solution but it doesn't work for me.. I know that when tableview scrolls it reuse cell but i doesn't know the approach of maintaining the button state . i'll try with following link

• 
  

  How to use Reusable Cells in uitableview for IOS

  
  


• 
  

  IOS: Maintaining button state in uitableviewcell

  
  


• 
  

  How to Handle Favourite button clicks in custom Tableview cells iOS?

  
  

I done all the things.use tags, use touch points and all but nothing seems to work for me.so help me out..and here is my sample code

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
  cell = (subcategoryCell *)[tableView dequeueReusableCellWithIdentifier:NSStringFromClass([subcategoryCell class]) forIndexPath:indexPath];


/*
 *  Set button for cell to subscribe with it
 */
cell.btnsubscribe = (UIButton *)[cell.contentView viewWithTag:303];
cell.btnsubscribe.tag = indexPath.row ;
_arraybtnState = [NSMutableArray arrayWithArray:[self.strSubscribe componentsSeparatedByString:@","]];

[cell.btnsubscribe addTarget:self action:@selector(clickBtnSubscribe:) forControlEvents:UIControlEventTouchUpInside];

if (![_arraybtnState containsObject:[NSNumber numberWithInt:indexPath.row]] )
    {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:YES];
    }
    else {
        [cell.btnsubscribe setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
        [cell.btnsubscribe setSelected:NO];
    }

  return cell;
  }

And the click event method...

- (IBAction)clickBtnSubscribe:(id)sender {

UIButton *button = (UIButton*)sender;
NSLog(@"selected button tag %li", (long)button.tag);
NSNumber *tagnum = [NSNumber numberWithLong:(long)button.tag];

if (button.selected) {
    [self.arraybtnState addObject:tagnum];
    [button setImage:[UIImage imageNamed:@"following"] forState:UIControlStateNormal];
    NSLog(@"Subscribe");
    [self subscribeButton:button.tag];
    [button setSelected:NO];
}
else
{
    [self.arraybtnState removeObject:tagnum];
    [button setImage:[UIImage imageNamed:@"follow"] forState:UIControlStateNormal];
    NSLog(@"unsubscribe");
    [self unsubscribeButton:button.tag];
    [button setSelected:YES];
}

}   

Note: In this code, button is created in storyboard.,but i'll also tried without storyboard too.