解析xml内容标签

问题描述：

我的问题是，我不能从xml文件解析标签。它返回一个空值，即时通过使用％@的NSLog测试它。解析xml内容标签

如果有人能指出我的解决方案，我会非常感激。

这里是代码： BOOL processed = NO; 如果（currentText）{

// Remove newlines and whitespace from currentText 
    NSString *processedText = [currentText stringByRemovingNewLinesAndWhitespace]; 

    // Process 
    switch (feedType) { 
     case FeedTypeRSS: { 

      // Item 
      if (!processed) { 
       if ([currentPath isEqualToString:@"/rss/channel/item/title"]) { if (processedText.length > 0) item.title = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/url"]) { if (processedText.length > 0) item.image = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/category"]) { if (processedText.length > 0) item.category = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/link"]) { if (processedText.length > 0) item.link = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/guid"]) { if (processedText.length > 0) item.identifier = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/description"]) { if (processedText.length > 0) item.summary = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/content:encoded"]) { if (processedText.length > 0) item.content = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/pubDate"]) { if (processedText.length > 0) item.date = [NSDate dateFromInternetDateTimeString:processedText formatHint:DateFormatHintRFC822]; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/enclosure"]) { [self createEnclosureFromAttributes:currentElementAttributes andAddToItem:item]; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/item/dc:date"]) { if (processedText.length > 0) item.date = [NSDate dateFromInternetDateTimeString:processedText formatHint:DateFormatHintRFC3339]; processed = YES; } 
      } 

      // Info 
      if (!processed && feedParseType != ParseTypeItemsOnly) { 
       if ([currentPath isEqualToString:@"/rss/channel/title"]) { if (processedText.length > 0) info.title = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/url"]) { if (processedText.length > 0) item.image = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/category"]) { if (processedText.length > 0) item.category = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/description"]) { if (processedText.length > 0) info.summary = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rss/channel/link"]) { if (processedText.length > 0) info.link = processedText; processed = YES; } 
      } 

      break; 
     } 
     case FeedTypeRSS1: { 

      // Item 
      if (!processed) { 
       if ([currentPath isEqualToString:@"/rdf:RDF/item/title"]) { if (processedText.length > 0) item.title = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/url"]) { if (processedText.length > 0) item.image = processedText; processed = YES; } 
       else if([currentPath isEqualToString:@"/rss/channel/item/category"]) { if (processedText.length > 0) item.category = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/link"]) { if (processedText.length > 0) item.link = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/dc:identifier"]) { if (processedText.length > 0) item.identifier = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/description"]) { if (processedText.length > 0) item.summary = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/content:encoded"]) { if (processedText.length > 0) item.content = processedText; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/dc:date"]) { if (processedText.length > 0) item.date = [NSDate dateFromInternetDateTimeString:processedText formatHint:DateFormatHintRFC3339]; processed = YES; } 
       else if ([currentPath isEqualToString:@"/rdf:RDF/item/enc:enclosure"]) { [self createEnclosureFromAttributes:currentElementAttributes andAddToItem:item]; processed = YES; } 
      }

呼叫的方法：

//定制表格视图单元格的外观。 - （UITableViewCell的*）的tableView：（UITableView的*）的tableView的cellForRowAtIndexPath：（NSIndexPath *）indexPath {

static NSString *CellIdentifier = @"Cell"; 

UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
if (cell == nil) { 
    cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier]; 
    cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; 
} 

// Configure the cell. 
MWFeedItem *item = [itemsToDisplay objectAtIndex:indexPath.row]; 
if (item) { 
    NSLog(@"content = %@",item.content);//<-------------------------------------------Returns a NULL 
    // Process 
    NSString *itemTitle = item.title ? [item.title stringByConvertingHTMLToPlainText] : @"[No Title]"; 
    NSString *itemSummary = item.summary ? [item.summary stringByConvertingHTMLToPlainText] : @"[No Summary]"; 

    // Set 
    cell.textLabel.font = [UIFont boldSystemFontOfSize:15]; 
    cell.textLabel.text = itemTitle; 
    NSMutableString *subtitle = [NSMutableString string]; 
    if (item.date) [subtitle appendFormat:@"%@: ", [formatter stringFromDate:item.date]]; 
    [subtitle appendString:itemSummary]; 
    cell.detailTextLabel.text = subtitle; 

} 
return cell;

}

问候

答

在解析每一个元素解析器会返回一个空白字符作为回应，因为新的行/标签/回车。如果你已经实现了解析器的回调方法（委托），然后检查空值，并且我不知道你已经实现的地方（在这个意义上，解析器委托方法有这个）是第一个片段。

解析xml内容标签

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