使用 NSDictionary 将 XML 项目“类别”解析为 NSArray

Question

问题：

从 .XSD 模板生成的 XML 文件产生粘贴在下面的输出。由于 category 的键是 image，因此我解析 image 项目的标准方法不适用于 category。我想将 category name="Category #" 放入一个数组中，如何从类别字段中创建一个数组。

我需要什么：

我想要的是一个字典数组。每个位置都包含一个代表一个类别的字典，每个字典都包含该类别的图像。

Array: @"Category 1",@"Category 2",@"Category 3";

For each Array, a Dictionary with: <image> 以及介于两者之间的所有内容 </image>

基本上，我需要从 XML 数据源创建一个如下图所示的 plist

XML 输出：

<?xml version="1.0" encoding="UTF-8"?>
<app xmlns="http://www.wrightscs.com/_xml_.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.wrightscs.com/_xml_.xsd" name="Testing" unlock_product_id="com.wrightscs.all">
    <bannerImg>http://www.wrightscs.com</bannerImg> 
    <category name="Category 1" icon="http://www.wrightscs.com">
        <image>
                <title>title</title>
                <thumbUrl>http://www.wrightscs.com</thumbUrl>
                <sampleUrl>http://www.wrightscs.com</sampleUrl>
                <imageUrl>http://www.wrightscs.com</imageUrl>
                <description>These items / keys not an issue.</description>
                <infoUrl>http://www.wrightscs.com</infoUrl>
                <license>http://www.wrightscs.com</license>
                <licenseUrl>http://www.wrightscs.com</licenseUrl>
        </image>
    </category>
    <category name="Category 2" icon="http://www.wrightscs.com">
        <image>
                <title>title</title>
                <thumbUrl>http://www.wrightscs.com</thumbUrl>
                <sampleUrl>http://www.wrightscs.com</sampleUrl>
                <imageUrl>http://www.wrightscs.com</imageUrl>
                <description>These items / keys not an issue.</description>
                <infoUrl>http://www.wrightscs.com</infoUrl>
                <license>http://www.wrightscs.com</license>
                <licenseUrl>http://www.wrightscs.com</licenseUrl>
        </image>
    </category> 
    <category name="Category 3" icon="http://www.wrightscs.com">
        <image>
                <title>title</title>
                <thumbUrl>http://www.wrightscs.com</thumbUrl>
                <sampleUrl>http://www.wrightscs.com</sampleUrl>
                <imageUrl>http://www.wrightscs.com</imageUrl>
                <description>These items / keys not an issue.</description>
                <infoUrl>http://www.wrightscs.com</infoUrl>
                <license>http://www.wrightscs.com</license>
                <licenseUrl>http://www.wrightscs.com</licenseUrl>
        </image>
    </category>
</app>

注意：其他项目/键都不是问题，我只对将类别制作成数组感兴趣。此示例中的 URL 也被替换为原始内容。

Answer 1

解决方案：

#pragma mark -
#pragma mark Delegate Received

-(void)parsingComplete:(XMLDataSource*)theParser {
    NSArray *categoryArray = [theParser getCategories];
    [categoryArray writeToFile:PLIST atomically:YES];
}
- (void)receivedItems:(NSArray *)theItems {
    NSMutableArray *dataItems = [[NSMutableArray alloc] init];
    [dataItems addObjectsFromArray:[NSArray arrayWithContentsOfFile:PLIST]];

    NSDictionary * dataItem = [dataItems objectAtIndex:categoryIndex];
    data_ =  [dataItem objectForKey:@"images"];

    [[NSNotificationCenter defaultCenter] postNotificationName:@"updateThumbs" object:nil];
}


#pragma mark -
#pragma mark Parsing Delegates

- (void)parse:(NSData *)data withDelegate:(id)sender onComplete:(SEL)callback 
{
    parentDelegate = sender;
    onCompleteCallback = callback;
    loading = YES;

    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data];
    [parser setDelegate:self];
    [parser setShouldProcessNamespaces:NO];
    [parser setShouldReportNamespacePrefixes:NO];
    [parser setShouldResolveExternalEntities:NO];
    [parser parse];
}
- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError {
    parsed = NO;
    loading = NO;
}
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict 
{
    NSString *element = [elementName stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    currentElement = element;
    if ([[currentElement lowercaseString] isEqual:@"image"]) {
        inImage = YES;
        itemsDictionary = [[NSMutableDictionary alloc] init];
        [itemsDictionary addEntriesFromDictionary:attributeDict];
    }

    if ([[currentElement lowercaseString] isEqual:@"category"]) {
        inCategory = YES;
        categoryDictionary = [[NSMutableDictionary alloc] init];
        [categoryDictionary addEntriesFromDictionary:attributeDict];
    }
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName 
{
    NSString *element = [elementName stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    if ([[element lowercaseString] isEqual:@"image"]) {
        inImage = NO;
        [items addObject:[itemsDictionary copy]];
    }

    if ([[element lowercaseString] isEqual:@"category"]) {
        inCategory = NO;
        [categoryDictionary setObject:[items copy] forKey:@"images"];
        [items removeAllObjects];
        [categories addObject:[categoryDictionary copy]];
    }
}
- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string 
{
    NSString *stringValue = [string stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];
    NSString *element = [currentElement stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]];

    /*  skip over blank elements.  */
    if (stringValue == nil || [stringValue isEqual:@""]) {
        return;
    }

    if (element != nil && [element length] > 0) {
        if (inImage) {
            if ([itemsDictionary objectForKey:element] != nil) {
                [itemsDictionary setObject:[NSString stringWithFormat:@"%@%@", [itemsDictionary objectForKey:element], stringValue]
                                    forKey:element];
            } else {
                [itemsDictionary setObject:stringValue forKey:element];
            }
        } else if ((!inImage) && (inCategory)) {
            if ([categoryDictionary objectForKey:element] != nil) {
                [categoryDictionary setObject:[NSString stringWithFormat:@"%@%@", [categoryDictionary objectForKey:element], stringValue]
                                       forKey:element];
            } else {
                [categoryDictionary setObject:stringValue forKey:element];
            }
        } else {
            if ([root objectForKey:element] != nil) {
                [root setObject:stringValue forKey:element];
            }
        }
    }
}
- (void)parserDidStartDocument:(NSXMLParser *)parser {
    NSError * err;
    if(![[NSFileManager defaultManager] fileExistsAtPath:PLIST]) {
        [[NSFileManager defaultManager] removeItemAtPath:PLIST error:&err];
    }
}
- (void)parserDidEndDocument:(NSXMLParser *)parser 
{
    parsed = YES;
    loading = NO;

    if ([parentDelegate respondsToSelector:onCompleteCallback]) {
        [parentDelegate performSelector:onCompleteCallback withObject:self];
    }

    if ([self respondsToSelector:@selector(receivedItems:)])
        [self receivedItems:items];
    else
        SHOW_ALERT(@"parserDidEndDocument:", @"receivedItems: not responding!", nil, @"Okay", nil)
}


#pragma mark -
#pragma mark Setters / Getters

- (id)delegate {
    return self;
}
- (void)setDelegate:(id)new_delegate {
    _delegate = self;
}
- (BOOL)isSuccessful {
    return success;
}
- (BOOL)isLoading {
    return loading;
}
- (BOOL)isParsed {
    return parsed;
}
- (NSArray *)getCategories {
    return categories;
}
- (NSDictionary *)getRoot {
    return root;
}
- (void)dealloc {
    [super dealloc];
}

Answer 2

看看 xpath 和这个：http://blog.objectgraph.com/index.php/2010/02/24/parsing-html-iphone-development/

在这种情况下，您需要的 xpath 是

//类别/@名称

上面提到的库应该返回数组中的类别名称。

有关更多 xpath 语法，请查看：http://www.w3schools.com/xpath/default.asp