Question

我对这段代码感到非常沮丧，已经过了好几周，我无法找到问题的解决方案。我的RSS应用程序与一些RSS工作很好，它成功地将图像从文章拉到缩略图到我的表格视图。我知道RSS XML类型的文件在这个结构中看起来很棒，它很有效：

<item>
<title>" title going to be here "</title>
 <description>
    here is the description plus the image file <p><img src='http://img.mako.co.il/2014/05/20/maytal_7_a.jpg'/></p>
   </description>
  <link>
  here is going to be the link 
 </link>

我的问题是有些RSS没有描述中的图像，所以我需要将它从自己的文章中删除。我当前的cellForRowAtIndexPath代码是这样的：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
  {   
NewsItemCell *cell = (NewsItemCell *)[tableView dequeueReusableCellWithIdentifier:STORYBOARD_KEY__ID__NEWS_ITEM_TABLE_CELL];

if (cell == nil)
{
    cell = [[NewsItemCell alloc] initWithFrame:CGRectMake(0, 0, MAIN_TABLE_CELL__NEWS_ITEM_CELL_WIDTH, MAIN_TABLE_CELL__NEWS_ITEM_CELL_HEIGHT)];
}

NewsItem *currentNewsItem = [self.newsItemsForSingleSource objectAtIndex:indexPath.row];
NSString* imageURL = currentNewsItem.imageUrl;

if ( [imageURL length] > 0 ) {
    [cell.thumbnailImageView setImageWithURL: [NSURL  URLWithString: [imageURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]] ];
}
else {
    // placeholder if no image available
    //        cell.thumbnailImageView.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.9];

    NSString * filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"placeholder_1.png"];
    [cell.thumbnailImageView setImage:[UIImage imageWithContentsOfFile:filePath]];
}

cell.titleLabelView.text = currentNewsItem.title;
cell.newsItem = currentNewsItem;

return cell;

}

在我的其他应用程序中，我使用这种代码模式来抓取文章的第一个图像并且它的效果非常好：

 MWFeedItem *item = [listadoArticulos objectAtIndex:indexPath.row];

    // my Method to search and fetch the pictures to cell 
if (item) {
    NSString *htmlContent = item.content;
    NSString *imgSrc;

    // find match for image
    NSRange rangeOfString = NSMakeRange(0, [htmlContent length]);
    NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(<img.*?src=\")(.*?)(\".*?>)" options:0 error:nil];

    if ([htmlContent length] > 0) {
        NSTextCheckingResult *match = [regex firstMatchInString:htmlContent options:0 range:rangeOfString];

        if (match != NULL ) {
            NSString *imgUrl = [htmlContent substringWithRange:[match rangeAtIndex:2]];
            NSLog(@"url: %@", imgUrl);

           NSLog(@"match %@", match);
            if ([[imgUrl lowercaseString] rangeOfString:@"feedburner"].location == NSNotFound) {
             imgSrc = imgUrl;

                 [cell.myCellImage setImageWithURL:[NSURL URLWithString:imgSrc]  placeholderImage:[UIImage imageNamed:@"customItem30.png"]];
               }}}}

我的问题是，我如何将它们两者结合起来？或者也许有人可以考虑其他解决方案（比我的代码更好）。任何帮助将不胜感激。

编辑**：哦，我忘了把CellForRowAtIndex

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
   {   
NewsItemCell *cell = (NewsItemCell *)[tableView dequeueReusableCellWithIdentifier:STORYBOARD_KEY__ID__NEWS_ITEM_TABLE_CELL];

if (cell == nil)
{
    cell = [[NewsItemCell alloc] initWithFrame:CGRectMake(0, 0, MAIN_TABLE_CELL__NEWS_ITEM_CELL_WIDTH, MAIN_TABLE_CELL__NEWS_ITEM_CELL_HEIGHT)];
}

NewsItem *currentNewsItem = [self.newsItemsForSingleSource objectAtIndex:indexPath.row];
NSString* imageURL = currentNewsItem.imageUrl;

if ( [imageURL length] > 0 ) {
    [cell.thumbnailImageView setImageWithURL: [NSURL  URLWithString: [imageURL stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]] ];
}
else {
    // placeholder if no image available
    //        cell.thumbnailImageView.backgroundColor = [UIColor colorWithRed:0.4 green:0.4 blue:0.4 alpha:0.9];

    NSString * filePath = [[[NSBundle mainBundle] resourcePath] stringByAppendingPathComponent:@"placeholder_1.png"];
    [cell.thumbnailImageView setImage:[UIImage imageWithContentsOfFile:filePath]];
}

cell.titleLabelView.text = currentNewsItem.title;
cell.newsItem = currentNewsItem;

return cell;

}

Answer 1

首先，您可以使用正则表达式（另一个应用程序）检查RSS提要是否包含描述标记中的任何图像URL。如果存在图像，则只需创建新闻项对象并添加该文章。

    NSMutableArry * newsItemsForSingleSource = [[NSMutableArray alloc]init];
     for(int i=0;i<listadoArticulos.count;i++)
      {
          MWFeedItem *item = [listadoArticulos objectAtIndex:i];

         // my Method to search and fetch the pictures to cell 
        if (item) {
              NSString *htmlContent = item.content;
              NSString *imgSrc;

            // find match for image
           NSRange rangeOfString = NSMakeRange(0, [htmlContent length]);
           NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern:@"(<img.*?src=\")(.*?)(\".*?>)" options:0 error:nil];

            if ([htmlContent length] > 0) {
                   NSTextCheckingResult *match = [regex firstMatchInString:htmlContent options:0 range:rangeOfString];

             if (match != NULL ) {
                         NSString *imgUrl = [htmlContent substringWithRange:[match rangeAtIndex:2]];
                          NSLog(@"url: %@", imgUrl);

                          NSLog(@"match %@", match);
             if ([[imgUrl lowercaseString] rangeOfString:@"feedburner"].location == NSNotFound) {
                      imgSrc = imgUrl;

                      NewsItem * currentNewsItem = [[NewsItem alloc]init];
                      currentNewsItem.imageUrl = imgSrc;
                      currentNewsItem.title = @"title";
                      currentNewsItem.Description = @"description";
                      [self.newsItemsForSingleSource addObject:currentNewsItem];
                      [currentNewsItem release];

           }}}}
  }

然后在tableview cellForRowAtIndexPath中填充NewsItem。你有新闻肯定包含图片。

带有Image单元格的TableView，需要改进我的代码

1 个答案: