如何在xcode中解析多级xml

Question

你能帮我完成这个程序吗?我正在试着用两层解析一个xml文件(我不知道这个术语，所以我这样叫)这是我的xml文件的示例

<?xml version="1.0" encoding="UTF-8"?>
<countries>
<country>
    <countryname>Philippines</countryname>
<subsidiaries>
    <subsidiary>
           <name>Sart Philippines Inc.</name>
           <address>Unit 10-A The World Empire Building, 330 Senator Gil Puyat Avenue  Philippines, Philippines</address>
           <phone>+63.2.929</phone>
           <fax>+63.932</fax>
           <email>enquiry.philippines@sarts.com</email>
           <website>http://www.sartorius-mechatronics.com.ph</website>
    </subsidiary>
</subsidiaries>
</country>
<country>
    <countryname>Denmark</countryname>
    <subsidiaries>
        <subsidiary>
           <name>Stedim Nordic A|S</name>
           <address>Hoerskaetten 6d 2630 Taastrup, Denmark</address>
           <phone>+45.7023.4400</phone>
           <fax>+45.4630.4030</fax>
           <email>ne.customersupport@sartorius.com</email>
           <website></website>
        </subsidiary>
        <subsidiary>
           <name>Nordic A|S</name>
           <address>Hoerskaetten 6D 2630 Taastrup, Denmark</address>
           <phone>+45.7523.8700</phone>
           <fax>+45.4130.4020</fax>
           <email>ne.customersupport@sartorius.com</email>
           <website></website>
       </subsidiary>
     </subsidiaries>
   </country>
</countries>

我计划做的是你选择一个国家，然后你选择一个子公司来查看它的信息。我能够解析它，但我无法显示Stedim Nordic A|S子公司。

下面是我的解析器类

@implementation Parser

-(id)initParser
{
    if (self == [super init])
    {
        app = (AppDelegate *) [[UIApplication sharedApplication]delegate];
    }
    return self;
}

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:    (NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementName isEqualToString:@"countries"])
    {
        app.listArray = [[NSMutableArray alloc]init];

    }
  if ([elementName isEqualToString:@"country"])
    {
        theList = [[List alloc]init];

    }

}

-(void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
{
    if (!currentElementValue)
    {
        currentElementValue = [[NSMutableString alloc]initWithString:string];
    }
    else
    {
        [currentElementValue appendString:string];
    }
}

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

   if ([elementName isEqualToString:@"country"])
    {
        [app.listArray addObject:theList];
    }

    else {

         if ([elementName isEqualToString:@"countryname"]) {
            theList.countryname = currentElementValue;
        }
        if ([elementName isEqualToString:@"name"])
        {
            theList.name = currentElementValue;
        }
        if ([elementName isEqualToString:@"address"])
        {
            theList.address = currentElementValue;
        }
        if ([elementName isEqualToString:@"phone"])
        {
            theList.phone = currentElementValue;
        }
        if ([elementName isEqualToString:@"fax"])
        {
            theList.fax = currentElementValue;
        }
        if ([elementName isEqualToString:@"email"])
        {
            theList.email = currentElementValue;
        }
        if ([elementName isEqualToString:@"website"])
        {
            theList.website = currentElementValue;

      }

       currentElementValue = nil;

    }


}
@end

我不能很好地解释它，但我希望你能帮助我，如果你能给我一个关于这类问题的教程链接，我将非常感激

Answer 1

这个问题是因为您的第二个country元素上有两个subsidiary。因此，您需要修改代码，如下所示：

您需要另一个用于保存Country Name的NSString。

NSString *temp = nil;

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:    (NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    if ([elementName isEqualToString:@"countries"])
    {
        app.listArray = [[NSMutableArray alloc]init];

    }
    if ([elementName isEqualToString:@"subsidiary"])
    {
        theList = [[List alloc]init];
    }
}


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

   if ([elementName isEqualToString:@"subsidiary"])
    {
        theList.countryname = temp;
        [app.listArray addObject:theList];
    }
    else
    {

         if ([elementName isEqualToString:@"countryname"])
         {
            temp = currentElementValue;
         }
        if ([elementName isEqualToString:@"name"])
        {
            theList.name = currentElementValue;
        }
        if ([elementName isEqualToString:@"address"])
        {
            theList.address = currentElementValue;
        }
        if ([elementName isEqualToString:@"phone"])
        {
            theList.phone = currentElementValue;
        }
        if ([elementName isEqualToString:@"fax"])
        {
            theList.fax = currentElementValue;
        }
        if ([elementName isEqualToString:@"email"])
        {
            theList.email = currentElementValue;
        }
        if ([elementName isEqualToString:@"website"])
        {
            theList.website = currentElementValue;
        }
        currentElementValue = nil;
    }
}

Answer 2

你可以递归地调用解析器。如果你知道你要找的是什么，搜索它是否可用，如果有，就取它的值。我建议您研究一下gdata xml解析器。