自定义tableview的节头

Question

我已使用此代码自定义节标题的视图

 - (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section {

    supplierDetail = [sectionArray objectAtIndex:section];
    NSArray *array = [[NSArray alloc] initWithArray:supplierDetail.leadDetails];
    for(int i = 0 ; i<[array count]; i++){
        dictionary = [[NSDictionary alloc] initWithDictionary:[array objectAtIndex:i]];
        string = [dictionary valueForKey:@"mgrIDinfo"];

    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 300, 60)];
    view.backgroundColor = [UIColor colorWithRed:136.0/255.0 green:152.0/255.0 blue:163.0/255.0 alpha:1.0];
    view.layer.masksToBounds = YES;
    view.layer.borderColor = [UIColor colorWithRed:93.0/255.0 green:106.0/255.0 blue:114.0/255.0 alpha:1.0].CGColor;
    view.layer.borderWidth = 0.5;

    UILabel *label = [[[UILabel alloc] init] autorelease];
    label.frame = CGRectMake(70, 10, 200, 25);
    label.backgroundColor = [UIColor clearColor];
    label.textColor = [UIColor whiteColor];
    label.shadowOffset = CGSizeMake(0.0, 1.0);
    label.font = [UIFont boldSystemFontOfSize:16];
    label.textAlignment = UITextAlignmentLeft;

    UIImageView *imageView = [[UIImageView alloc] init];
    imageView.frame = CGRectMake(10,3,40,40);
    imageView.layer.cornerRadius = 6.0;
    imageView.layer.masksToBounds = YES;
    imageView.layer.borderColor = [UIColor blackColor].CGColor;
    imageView.layer.borderWidth = 1.0;
    label.text = [supplierDetail.systemname uppercaseString];;
    [imageView setImageWithURL:[NSURL URLWithString:[NSString stringWithFormat:@"%@",supplierDetail.logo]]];
    [view autorelease];
    [view addSubview:label];
    [view addSubview:imageView];

    if(string ){
        NSLog(@"string in %@", string);
        return view;
        } 
    }

return 0;
 }
 }

但我想如果字符串存在，那么自定义视图标题将会出现，否则它将不会来.. 等待想法..