如何从xml获取图像？

Question

我是iPhone的新手开发者.我正在进行简单的xml解析演示.我想如何获得xml代码后面的图像???

<item> 
      <title>Rain washes out England qualifier</title>  
      <description>England's World Cup qualifier against Poland is postponed because of a waterlogged pitch and is rescheduled for 16:00 BST on Wednesday.</description>  
      <link>http://www.bbc.co.uk/sport/0/football/19941036</link>  
      <guid isPermaLink="false">http://www.bbc.co.uk/sport/0/football/19941036</guid>  
      <pubDate>Tue, 16 Oct 2012 21:18:26 GMT</pubDate>  
      <media:thumbnail width="66" height="49" url="http://news.bbcimg.co.uk/media/images/63530000/jpg/_63530879_016250328-1.jpg"/>  
      <media:thumbnail width="144" height="81" url="http://news.bbcimg.co.uk/media/images/63529000/jpg/_63529179_016250328-1.jpg"/> 
    </item>  

我怎么能得到图像？

我已经使用以下代码获得标题或描述.

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

    if([elementName  isEqualToString:className])
    {
        [items addObject:item];
        [item release];
        item = nil;
    }
    else
    {
        if([currentNodeContent length] != 0)
        {

            if([className  isEqualToString:@"item"])
            {


                if([elementName  isEqualToString:@"title"]|| [elementName  isEqualToString:@"description"] || [elementName isEqualToString:@"url"])
                {
                    [item setValue:currentNodeContent forKey:currentNodeName];

                    if ([elementName isEqualToString:@"media:thumbnail"])
                    {
                         [item setValue:currentNodeContent forKey:@"url"];
                    }

                }


                else
                {

                }

            }
        }
            else
            {
            }

        }


    [currentNodeContent release];
    currentNodeContent = nil;
    [currentNodeName release];
    currentNodeName = nil;

}

提前致谢.

Answer 1

您的 xml 在服务器上只有图像的 url，因此在解析时将此 url 保存在字符串中。当您需要在屏幕上显示图像时，使用以下命令从 url 获取图像

NSData* imageData = [NSData dataWithContentsOfURL:[NSURL urlWithString:your_url]];
UIImage* image = [UIImage imageWithData:imageData];

要异步加载图像，Git Hub 上有很多可用的示例，请使用 asyncImage，它会缓存最近下载的图像。