将具有相同名称的重复元素解析到NSArray中?

时间:2012-11-30 14:55:16

标签: objective-c xml xml-parsing nsxmlparser xcode4.5

除了存储在NSArray中的dog之外,所有元素都存储在NSStrings中。我希望将所有狗条目添加到NSArray中。现在只有一个狗值被添加到数组中。如何将所有狗值添加到NSArray?

<root>
         <element>
                <person>Jim<person/> 
                <age>21<age/>
                <dog>Labrador<dog/>
                <dog>Beagle<dog/>
                <dog>Yorkshire Terrier<dog/>
         <element/>
         <element>
                <person>Jill<person/> 
                <age>50<age/>
                <dog>Boxer<dog/>
                <dog>Pug<dog/>
                <dog>Labrador<dog/>
                <dog>Beagle<dog/>
                <dog>Yorkshire Terrier<dog/>
         <element/>
     </root>


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

        if([elementName isEqualToString:@"root"]) {
            //Initialize the array.
            appDelegate.entries = [[NSMutableArray alloc] init];
        }
        else if([elementName isEqualToString:@"element"]) {

            //Initialize the entry.
            anEntry = [[Entry alloc] init];

            //Extract the attribute here.
            anEntry.entryID = [[attributeDict objectForKey:@"id"] integerValue];

            NSLog(@"Reading id value :%i", anEntry.entryID);
        }

        NSLog(@"Processing Element: %@", elementName);
    }

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

        if(!currentElementValue) 
            currentElementValue = [[NSMutableString alloc] initWithString:string];
        else
            [currentElementValue appendString:string];

        NSLog(@"Processing Value: %@", currentElementValue);

    }

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

        if([elementName isEqualToString:@"root"])
            return;


        if([elementName isEqualToString:@"element"]) {
            [appDelegate.entries addObject:anEntry];

            anEntry = nil;
        }
        else
            [anEntry setValue:currentElementValue forKey:elementName];

        currentElementValue = nil;
    }

1 个答案:

答案 0 :(得分:0)

原因是钥匙狗有多个值 所以如果你说:

[anEntry setValue:currentElementValue forKey:elementName];

然后那个键(elementName)可能已经包含了一个值。你正在使用解析器,你已经理解它是如何工作的,唯一的是你必须考虑所有的标签,而不仅仅是元素和root。 if-then.else你还必须考虑标签是狗的情况:

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

    if([elementName isEqualToString:@"root"])
        return;


    if([elementName isEqualToString:@"element"]) {
        [appDelegate.entries addObject:anEntry];

        anEntry = nil;
    }
    else if([elementName isEqualToString: @"dog"])
    {
        [anEntry.dogs addObject: currentElementValue];
    }
    else
        [anEntry setValue:currentElementValue forKey:elementName];

    currentElementValue = nil;
}

这种情况下你的入门类应该有一个名为dogs的属性,它是一个NSMutableArray,可读。