delete some lines in 

    UILabel * label = (UILabel*)[cell viewWithTag:-100];
    [label removeFromSuperview];
    UILabel * label1 = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 120, 200)];
    [cell addSubview:label1];
    label1.backgroundColor = [UIColor redColor];
    label1.tag = -100;
    label1.text = [NSString stringWithFormat:@"Cell %d", indexPath.row];