ios - iOS 中的 xmpp IQ XML 解析

Question

我收到以下 XML IQ 并想在 iOS 中解析它。请帮忙!

     <iq type="result">
        <stories xmlns="success">

            <storyid>1</storyid>
            <title>THE TITLE</title>
            <picture>BASE64EncodedStringOfImage</picture>

            <storyid>2</storyid>
            <title>Love At First Site</title>
            <picture>BASE64EncodedStringOfImage</picture>

        </stories>
     </iq>

我尝试了下面的代码，但它不起作用。它获取 successStoryArray 中的值，但之后什么也没有。请帮忙!

    NSXMLElement *stories = [iq elementForName:@"stories"];
    NSArray *successStoryArray = [stories elementsForName:@"storyid"];
    NSLog(@"successStoryArray: %@", successStoryArray);
    for (NSXMLElement *i in successStoryArray)
    {
        NSXMLElement *title = [i elementForName:@"title"];
        NSString *sTitle = [title stringValue];
        NSLog(@"sTitle: %@", sTitle);
        NSXMLElement *picture = [i elementForName:@"picture"];
        NSString *sPicture = [picture stringValue];
        NSLog(@"sPicture: %@", sPicture);

    }

Answer 1

您正在迭代错误的元素。 NSArray *successStoryArray = [stories elementsForName:@"storyid"]; 将得到两个元素:storyid 值为 1 和 storyid 值为 2。然后您遍历这些元素并尝试提取标题和图片，但标题和图片不是 的子元素。标题和图片与storyid同级，都是.

有两种解决方法:

提取 3 个数组，每个包含 storyid、title 和 picture 的值

NSArray *successStoryArray = [stories elementsForName:@"storyid"];
NSArray *titleArray = [stories elementsForName:@"title"];
NSArray *pictureArray = [stories elementsForName:@"picture"];

然后您可以按顺序迭代它们并且项目将匹配

更好在我看来，通过将每个故事包装在一个元素中来更改 XML 的结构，如下所示:

     <iq type="result">
        <stories xmlns="success">
          <story>
            <storyid>1</storyid>
            <title>THE TITLE</title>
            <picture>BASE64EncodedStringOfImage</picture>
          </story>
          <story>
            <storyid>2</storyid>
            <title>Love At First Site</title>
            <picture>BASE64EncodedStringOfImage</picture>
          </story>
        </stories>
     </iq>

然后你可以这样做:

    NSXMLElement *stories = [iq elementForName:@"stories"];
    NSArray *successStoryArray = [stories elementsForName:@"story"];
    NSLog(@"successStoryArray: %@", successStoryArray);
    for (NSXMLElement *i in successStoryArray)
    {
        NSXMLElement *storyId = [i elementForName:@"storyId"];
        NSString *sId = [storyId stringValue];
        NSLog(@"sId: %@", sId);
        NSXMLElement *title = [i elementForName:@"title"];
        NSString *sTitle = [title stringValue];
        NSLog(@"sTitle: %@", sTitle);
        NSXMLElement *picture = [i elementForName:@"picture"];
        NSString *sPicture = [picture stringValue];
        NSLog(@"sPicture: %@", sPicture);

    }