网络图片 高度

• (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {
  PJJokeTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"TextJokeCell"];
  if (cell == nil) {
  cell = [[PJJokeTableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"TextJokeCell"];
  }
  PJJoke *joke = self.jokes[indexPath.row];
  cell.time.text = joke.time;
  cell.text.text = joke.text;
  if (joke.imgurl && joke.imgurl.length > 0) {
  SDImageCache *imageCache = [SDImageCache sharedImageCache];
  if ([imageCache diskImageExistsWithKey:joke.imgurl]) {
  [cell.image setImage:[imageCache imageFromDiskCacheForKey:joke.imgurl]];
  } else {
  [cell.image setImageWithURL:[NSURL URLWithString:joke.imgurl]
  completed:^(UIImage *image, NSError *error, SDImageCacheType cacheType) {
  if (error == nil && image && joke && tableView) {
  joke.imageWidth = image.size.width;
  joke.imageHeight = image.size.height;
  [tableView beginUpdates];
  [tableView endUpdates];
  }
  }];
  }
  }
  return cell;
  }

• (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
  {
  PJJoke *joke = self.jokes[indexPath.row];
  SDImageCache *imageCache = [SDImageCache sharedImageCache];
  if ([imageCache diskImageExistsWithKey:joke.imgurl]) {
  UIImage * = [imageCache imageFromDiskCacheForKey:joke.imgurl];
  joke.imageWidth = image.size.width;
  joke.imageHeight = image.size.height;
  }
  return [PJJokeTableViewCell heightForJoke:self.jokes[indexPath.row]];
  }