ios - 在iPhone中使用NSXmlParser时如何获取xml中标记的路径？

Question

我是iPhone开发的新手。在我的应用程序中，有多个具有相同名称的标签。我想获取标签的路径，以便确保获得正确的标签。
我的xml结构就像

<items>
   <name></name>
   <link></link>
   <items>
          <name></name>
          <link></link>
   </items>
</items>

Answer 1

需要完全相同的东西，猜想这是一个古老的问题，但是我会写下实现的内容:

- (void) parserDidStartDocument:(NSXMLParser *)parser
{
    NSLog(@"parserDidStartDocument");
    self.errorParsingDictionary = [NSMutableDictionary dictionary];
    self.nodeStack = [NSMutableArray array];
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict
{
    NSLog(@"didStartElement --> %@", elementName);
    [self.nodeStack addObject:elementName]; // Push
    NSString *currentPath = [self pathFromNodeStack];
//    [self.errorParsingDictionary setObject:[NSMutableDictionary dictionary]
//                                    forKey:currentPath];
    [self.errorParsingDictionary setValue:[NSMutableDictionary dictionary]
                               forKeyPath:currentPath];
}

-(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {
    NSLog(@"foundCharacters --> %@", string);
    NSString *currentPath = [self pathFromNodeStack];
//    NSMutableString *mutableString = [self.errorParsingDictionary objectForKey:currentPath];
    id nodeValue = [self.errorParsingDictionary valueForKeyPath:currentPath];
    NSMutableString *nodeString = nil;
    if (nil==nodeValue || ![nodeValue isKindOfClass:[NSString class]])
    {
        nodeString = [NSMutableString string];
//        [self.errorParsingDictionary setObject:mutableString
//                                        forKey:currentPath];
        [self.errorParsingDictionary setValue:nodeString
                                   forKeyPath:currentPath];
    }
    [nodeString appendString:string];
}

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

    NSLog(@"didEndElement   --> %@", elementName);
    [self.nodeStack removeObjectAtIndex:[self.nodeStack count]-1]; // Pop
}

- (void) parserDidEndDocument:(NSXMLParser *)parser
{
    NSLog(@"parserDidEndDocument");
    self.nodeStack = nil;
}

-(NSString*)pathFromNodeStack
{
    NSMutableString *path = [NSMutableString string];
    for (int i=0; i<self.nodeStack.count; i++)
    {
        [path appendString:[self.nodeStack objectAtIndex:i]];
        if (i!=self.nodeStack.count-1)
        {
            // If it is not the last object
            [path appendString:@"."];
        }
    }
    return path;
}

解析完成后，您现在可以使用字典: self.errorParsingDictionary获取任何路径的值，如下所示:

NSString *nodeValue = [self.errorParsingDictionary valueForKeyPath: @"items.items.name"];

希望这可以帮助。