ios - 在 iOS 中使用 NSXML 解析数据

Question

我正在尝试使用 NSXMLR 解析来自 Wordpress RSS 提要的数据。我的问题是导出已解析的数据。到目前为止，我有，

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

    currentElement = [elementName copy];

    if ([elementName isEqualToString:@"item"]){

        currentTitle = [[NSMutableString alloc] init];
        item = [[NSMutableDictionary alloc] init];
    }

}

这门课

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


    if ([elementName isEqualToString:@"item"]){
        [item setObject:currentTitle forKey:@"title"];
    }

    [stories addObject:item];
}


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

    if ([currentElement isEqualToString:@"title"]){
        [currentTitle appendString:string];
    }

}

NSMutableArray *故事；NSMutableDictionary *item;

所以在 ViewDidLoad 实现中，我有

//declare the object of allocated variable
NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"URL"]];// URL that given to parse.

//allocate memory for parser as well as
xmlParserObject =[[NSXMLParser alloc]initWithData:xmlData];
[xmlParserObject setDelegate:self];

//asking the xmlparser object to beggin with its parsing
[xmlParserObject parse];



NSLog(@"%@", [item objectForKey:@"title"]);

我的问题是我只打印一个对象，我有多个元素。我怎样才能让它扫描每一个并打印它们。

提前致谢。

Answer 1

如果我对你的代码理解正确，item 包含当前解析的项目，数组 stories 包含所有项目。

所以你必须先分配stories数组:

stories = [[NSMutableArray alloc] init];

然后你进行解析(但你应该添加错误检查):

NSData *xmlData=[[NSData alloc]initWithContentsOfURL:[NSURL URLWithString:@"URL"]];
xmlParserObject =[[NSXMLParser alloc]initWithData:xmlData];
[xmlParserObject setDelegate:self];
if (![xmlParserObject parse]) {
    // Parsing failed, report error...
}

最后打印数组的内容:

for (NSDictionary *story in stories) {
    NSLog(@"%@", [story objectForKey:@"title"]);
}

didEndElement 方法可能应该如下所示:

- (void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName{
    if ([elementName isEqualToString:@"item"]){
        [item setObject:currentTitle forKey:@"title"];
        [stories addObject:item]; // <-- MOVED INTO THE IF-BLOCK
    }
}