xml

1  导入xml包

2 设置building setting 

    （1） header search paths 设置为/usr/include/libxml2

       (2)   other linker flags 设置为  -lxml2  

3 导入头文件

4 根据data创建dataXML  

GDataXMLDocument *doucument = [[GDataXMLDocument alloc] initWithData:[request responseData] options:0 error:nil];

5 根据所需数据的路径获得数组

NSString *path = @"/rss/channel/image/url";

    NSArray *arr = [doucument nodesForXPath:path error:nil];

    GDataXMLElement *elem = [arr lastObject];

6 

GDataXMLElement *elem = [arr lastObject];

    NSLog(@"%@",[elem stringValue]);