ios – 使用NSXMLParser仅解析前十个帖子,然后分别解析下一个帖

我预计rss feed最终会包含几十个/几百个帖子.我目前的解决方案是读取整个RSS Feed并显示结果.但是我想只阅读前十个帖子(以防止它解析可能有数百个项目).然后在稍后的时间(例如当用户到达表的末尾时)来解析接下来的十个帖子.

所以我的问题是如何解析前十个帖子,然后解析接下来的十个帖子,然后解析接下来的十个帖子等等……

这是我用来获取所有帖子的内容：

- (void)parseXMLFileAtURL:(NSString *)URL
{   
    myArray = [[NSMutableArray alloc] init];

    //convert the path to a proper NSURL or it won't work
    NSURL *xmlURL = [NSURL URLWithString:URL];

    rssParser = [[NSXMLParser alloc] initWithContentsOfURL:xmlURL];
    [rssParser setDelegate:self];
    [rssParser parse];

}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
    //error
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict{            

    currentElement = [elementName copy];

    if ([elementName isEqualToString:@"item"]) {
        //clear out our story item caches...
        item = [[NSMutableDictionary alloc] init];

    }

}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{     

    if ([elementName isEqualToString:@"item"]) {
        // save values to an item,then store that item into the array...
    }

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{

    // save the characters for the current item...

}

- (void)parserDidEndDocument:(NSXMLParser *)parser {

    [myTable reloadData];

}