您发布的文章看起来相当全面。你实现了三个连接委托方法？执行 transmitXMLRequest：后， NSURLConnection 对象将自动开始加载数据。您的代理将看到以下内容：

The article that you posted looks pretty comprehensive. Did you implement the three connection delegate methods? Once you execute transmitXMLRequest:, the NSURLConnection object will automatically start loading in data. Your delegate will see the following:

connection:didReceiveResponse:
connection:didReceiveData:
connection:didReceiveData:
connection:didReceiveData:
...
connectionDidFinishLoading:

您在每个代理方法中放置的代码至关重要。没有它，不会从服务器中检索任何数据。

The code that you place in each of those delegate methods is critical. Without it, no data is ever retreived from the server.

在第3页的文章中，将介绍如何创建 NSXMLDocument 从接收的数据。 NSXMLDocument简化了解析XML文件的过程。有关详情，请参阅Apple的基于树的XML编程指南。

In your article, on page 3, it describes how to create an NSXMLDocument from the received data. NSXMLDocument simplifies the process of parsing an XML file. For details, see Apple's Tree-Based XML Programming Guide.