title: Uislider in uitableviewcell is no more auto-updated when I scroll
body: <p>I'm having a little trouble with my code, and I was hoping to get some help here</p>
  
  <p>I have a uitableview, in each uitableviewcell I put an individual uislider.
  Each uislider, is used as a progress bar for music playing. </p>
  
  <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
  
      UIButton *button = nil;
      UISlider *customSlider = nil;
  
      static NSString *CellIdentifier = @"cell";
      UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
  
      if (cell == nil) {
          cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier];
  
          UIImage *image = [UIImage imageNamed:@"button_play.png"];
          button = [UIButton buttonWithType:UIButtonTypeCustom];
          CGRect frame = CGRectMake(340.0, 10.0, image.size.width, image.size.height);
          button.frame = frame;
          [button setBackgroundImage:image forState:UIControlStateNormal];
          [button addTarget:self action:@selector(playAudio:) forControlEvents:UIControlEventTouchUpInside];
          button.tag = 4;
          [cell.contentView addSubview:button];
  
          customSlider = [[UISlider alloc] initWithFrame:CGRectMake(10, 45, 456, 20)];    
          customSlider.minimumValue = 0.0;
          customSlider.maximumValue = 100.0;
          customSlider.continuous = YES;
          customSlider.tag = 3;
          customSlider.value = 0.0;
          [cell.contentView addSubview:customSlider];
      }
  
      else {
          customSlider = (UISlider *)[cell.contentView viewWithTag:3];
          button = (UIButton *)[cell.contentView viewWithTag:4];
      }
      return cell;
  }
  
  
  - (void) playAudio:(UIButton *)sender {
  
  
      UIButton *button = (UIButton *)[sender superview];
      UITableViewCell *currentCellTouched = (UITableViewCell *)[button superview];
      UITableView *currentTable = (UITableView *)[currentCellTouched superview];
      NSIndexPath *indexPath = [currentTable indexPathForCell:currentCellTouched];
  
      //currentCellPlaying type of UITableViewCell and accessible from the rest classe
      currentCellPlaying = currentCellTouched;
  
      NSURL *url = [NSURL fileURLWithPath:[[NSBundle mainBundle] pathForResource:NSLocalizedString([listFilesAudio objectAtIndex:indexPath.row], @"") ofType:@"mp3"]];
  
      player = [[AVAudioPlayer alloc] initWithContentsOfURL:url error:nil];
      player.delegate = self;
      [player prepareToPlay];
  
      [(UISlider *)[currentCellTouched.contentView viewWithTag:3] setMaximumValue:[player duration]];
      [(UISlider *)[currentCellTouched.contentView viewWithTag:3] setValue:0.0];
  
      NSTimer *sliderTimer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateTime:) userInfo:nil repeats:YES];
      [player play];
  
  }
  
  
  - (void)updateTime:(NSTimer *)timer {
      [(UISlider *)[currentCellPlaying.contentView viewWithTag:3] setValue:player.currentTime];
  }
  </code></pre>
  
  <p>When I launch a single play, everything is okay and the progress bar is updated.</p>
  
  <p>My problem is that when I scroll down/up the tableview, and the cell where the music is playing disappears, once we come back over the cell playing the music, the uislider is back to 0, and is not updated anymore... (a NSLOG confirms that we still go inside "updateTime" method)</p>
  
  <p>If you have the solution for my problem, I would be very  glad to read it.</p>
  
  <p>Thank you in advance.</p>