当 NSXMLParser 遇到XML标签时，将调用委托方法 parser：didStartElement：namespaceURI：qualifiedName：attributes： ;你可能只需要在这里使用 elementName 变量。然后，XML解析器读取标记中的字符，并与内容一起调用 parser：foundCharacters：。最后 parser：didEndElement：namespaceURI：qualifiedName 被调用。

The first thing that happens when the NSXMLParser encounters an XML tag is that the delegate method parser:didStartElement:namespaceURI:qualifiedName:attributes: is called; you'll probably only need to use the elementName variable here. Then, the XML parser reads the characters in the tag and calls parser:foundCharacters: with the contents. Finally parser:didEndElement:namespaceURI:qualifiedName is called.

我采取的方法，在 SeismicXML 考试中使用以下方法：

The approach that I've taken, as Apple uses in the SeismicXML examlple, is to use the methods as follows:

1. 在 ：didStartElement：namespaceURI：qualifiedName：attributes：，将元素名称的字符串与已知值进行比较，看看它是否是您关心的字符串。如果是这样，然后设置一个实例变量（ NSMutableString ;我将其称为 contentOfCurrentXMLProperty ）为空字符串。否则将其设置为 nil 。


2. 在 parser：foundCharacters： contentOfCurrentXMLProperty 找到的字符。


3. 在解析器：didEndElement：namespaceURI：qualifiedName ，将 contentofCurrentXMLProperty 的值赋给任何适当的变量。

1. In parser:didStartElement:namespaceURI:qualifiedName:attributes:, compare the string of the element name to a known value to see if it's a string you care about. If so, then set an instance variable (an NSMutableString; I'll call it contentOfCurrentXMLProperty) to an empty string. Otherwise set it to nil.
2. In parser:foundCharacters:, append the found characters to contentOfCurrentXMLProperty.
3. In parser:didEndElement:namespaceURI:qualifiedName, assign the value of contentofCurrentXMLProperty to whatever the appropriate variable is.

有关详细信息，请参阅 SeismicXML 示例。

See the SeismicXML example for more information.

有关您的特定情况的几个问题：首先，由于XML解析器只返回字符串需要将 status 的字符串转换为整数（或您使用的任何数据类型）。

A couple of things about your specific case: first, since the XML parser only returns strings, you'll need to convert the string to an integer (or whatever data type you're using) for status.

第二，因为你只需要记录的第一个值，在 parser：didStartElement：... 设置 BOOL ，用于标记您之前是否已经看到记录标记，如果是，则设置 contentOfCurrentXMLProperty 至 nil 。

Second, since you only want the first value for record, in parser:didStartElement:... I'd set up a BOOL that flags whether you've already seen a record tag before and, if so, set contentOfCurrentXMLProperty to nil.