iphone - 如何使用 NSXMLParser 正确设置我的对象？

Question

我想要做的是让解析器遍历每一行 XML，然后将元素分配给一个对象。在行的末尾，对象被添加到 NSMutableString。我只想为每一行 XML 设置一个 faxRecipient 对象。

这是 XML 的示例输出:

<ContactId>23</ContactId><Name>name1</Name><Fax>+12345222</Fax><Company /><Rec>0</Rec><ContactId>24</ContactId><Name>name2</Name><Fax>+78903333</Fax><Company /><Rec>0</Rec> 

但是我的代码有问题，我不知道从这里去哪里:

-(void)parser:(NSXMLParser *)parser
didStartElement:(NSString *) elementName
 namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
   attributes:(NSDictionary *)attributeDict
{

    if ([elementName isEqual:@"ContactId"]) {
        faxRecipient =[[FaxRecipient alloc]init];
        remoteRecipientString = [[NSMutableString alloc]init]; 
    }

    else if ([elementName isEqual:@"Name"]) {
        faxRecipient =[[FaxRecipient alloc]init];
        remoteRecipientString = [[NSMutableString alloc]init]; 


    }else if ([elementName isEqual:@"Fax"]) {
        faxRecipient =[[FaxRecipient alloc]init];
        remoteRecipientString = [[NSMutableString alloc]init];
    }
    else if ([elementName isEqual:@"Company"]) {
    faxRecipient =[[FaxRecipient alloc]init];
    remoteRecipientString = [[NSMutableString alloc]init];
    }

}

-(void) parser:(NSXMLParser *)parser
foundCharacters:(NSString *)string{

    [remoteRecipientString appendString:string];

}


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


    if ([elementName isEqual:@"ContactId"]) {
        faxRecipient.contactID = remoteRecipientString;
        [remoteRecipientItems addObject:faxRecipient];
        [faxRecipient release];
        faxRecipient = nil;
        [remoteRecipientString release];
        remoteRecipientString = nil;
    }


    if ([elementName isEqual:@"Name"]) {
        faxRecipient.name = remoteRecipientString;
        [remoteRecipientItems addObject:faxRecipient];
        [faxRecipient release];
        faxRecipient = nil;
        [remoteRecipientString release];
        remoteRecipientString = nil;
    }   


    if ([elementName isEqual:@"Fax"]) {
        faxRecipient.fax = remoteRecipientString;
        [remoteRecipientID addObject:faxRecipient];
        [remoteRecipientString release];
        remoteRecipientString = nil;
        [faxRecipient release];
        faxRecipient = nil;
    }

    if ([elementName isEqual:@"Company"]) {
        faxRecipient.company = remoteRecipientString;
        [remoteRecipientID addObject:faxRecipient];
        [remoteRecipientString release];
        remoteRecipientString = nil;
        [faxRecipient release];
        faxRecipient = nil;
    }


}

Answer 1

您的 XML 是否传回顶级元素名称，例如:

<FaxRecipient><ContactId>23</ContactId><Name>name1</Name><Fax>+12345222</Fax><Company /><Rec>0</Rec><ContactId>24</ContactId><Name>name2</Name><Fax>+78903333</Fax><Company /><Rec>0</Rec>  </FaxRecipient>

如果是，那么您应该在 didStart 和 DidEnd 中检查开始元素，例如:

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *) elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
if ([elementName isEqualToString:@"FaxRecipient"] )
    {
    faxRecipient =[[FaxRecipient alloc]init];
    }
else if ([elementName isEqualToString:@"ContactId"] ||
         [elementName isEqualToString:@"Name"] ||
                     [elementName isEqualToString:@"Fax"] ||
         [elementName isEqualToString:@"Company"])
{
remoteRecipientString = [[NSMutableString alloc]init];
}
}

-(void)parser:(NSXMLParser *)parser didEndElement:(NSString *) elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
if ([elementName isEqual:@"FaxRecipient"])
    {
    [remoteRecipientItems addObject:faxRecipient];
    [faxRecipient release];
    faxRecipient = nil;
    }
else if ([elementName isEqual:@"ContactId"]) {
    faxRecipient.contactID = remoteRecipientString;
}
else if ([elementName isEqual:@"Name"]) {
    faxRecipient.name = remoteRecipientString;
}
else if ([elementName isEqual:@"Fax"]) {
    faxRecipient.fax = remoteRecipientString;
}
else if ([elementName isEqual:@"Company"]) {
    faxRecipient.company = remoteRecipientString;
} 

if ([elementName isEqualToString:@"ContactId"] ||
    [elementName isEqualToString:@"Name"] ||
    [elementName isEqualToString:@"Fax"] ||
    [elementName isEqualToString:@"Company"] )
{
[remoteRecipientString release];
    remoteRecipientString = nil;    }  
}

如果不是，那么您将需要检查是否要解析第一个元素 (ContactId) 并在 didStartElement 中进行额外的初始化。然后在 DidEndElement 中，当您刚刚找到最后一个元素 (Rec) 时执行 addobject。如果您的 XML 的结构能够识别它返回的对象，而不仅仅是基于元素在返回的 XML 中的当前位置的硬编码，那将是最好的。