细胞背景视图不填充整个细胞(Cell background view not filling the whole cell)

 我正在为UITableView使用单独的UITableView ，当我设置此单元格的背景视图时，它似乎将图像填充在一个框而不是整个单元格中。 单独的UITableViewCell和UITableView's行的尺寸均为280x44 。 这是一个看起来像的图像： 
 
 这是我为编写单元格的背景视图而编写的代码： 
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// ...

    PBDashboardSummarizedCell *cell = (PBDashboardSummarizedCell *)[tableView dequeueReusableCellWithIdentifier:@"PBDashboardSummarizedCell"];
    if (!cell) {
        cell = [PBDashboardSummarizedCell standardCell];
    }
     if(datapickup.isexpanded==YES)
          {
           UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 280, 44)];
              av.opaque = NO;
              av.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"dashboardCellEffect.png"]];
              cell.backgroundView = av;          //tried this
             // [cell setBackgroundView:av];     //and this also... but still image is set in the box and not the whole cell
          }
          else{
              UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 280, 44)];
              av.backgroundColor = [UIColor clearColor];
              av.opaque = NO;
              cell.backgroundView = av;

        }

          return cell;
}

I am using a separate UITableViewCell for the UITableView and when i set background View of this cell, it seems to fill the image in a box rather than the whole cell. The dimensions of both separate UITableViewCell and UITableView's row are 280x44. Here's an image of what it looks like: 
 
Here's the code that i am writing for setting the background view of the cell:
 
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
// ...

    PBDashboardSummarizedCell *cell = (PBDashboardSummarizedCell *)[tableView dequeueReusableCellWithIdentifier:@"PBDashboardSummarizedCell"];
    if (!cell) {
        cell = [PBDashboardSummarizedCell standardCell];
    }
     if(datapickup.isexpanded==YES)
          {
           UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 280, 44)];
              av.opaque = NO;
              av.backgroundColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"dashboardCellEffect.png"]];
              cell.backgroundView = av;          //tried this
             // [cell setBackgroundView:av];     //and this also... but still image is set in the box and not the whole cell
          }
          else{
              UIImageView *av = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 280, 44)];
              av.backgroundColor = [UIColor clearColor];
              av.opaque = NO;
              cell.backgroundView = av;

        }

          return cell;
}

原文：https://stackoverflow.com/questions/15353020