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我正在使用 Yahoo api 制作一个小天气应用程序。这个 api 给了我一个 XML 文件。我现在的问题是如何解析这个文件？这是我到目前为止的代码。

 AFXMLRequestOperation *operation = [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {
        NSLog(@"success");
        XMLParser.delegate = self;
        [XMLParser parse];
        NSLog(@"xmlParser is %@",XMLParser);
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, NSXMLParser *XMLParser) {
        NSLog(@"failure with error %@",error);
    }];

您可以在此处找到 XML 文件。

希望有人可以帮助我

4

2 回答 2

6

如果您希望使用 NSXMLParser 解析 XML，则需要有一个实现 NSXMLParserDelegate 的类。您可以为此使用 ViewController：

@interface ViewController : UIViewController <NSXMLParserDelegate>

然后使用此协议提供的 SAX 方法，您可以在运行时解析此 XML [XMLParser parse]。这是您的 xml 的示例：

- (IBAction) makeRequest:(id)sender
{
    NSLog(@"Making request");
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://weather.yahooapis.com/forecastrss?w=2442047&u=c"]];
    AFXMLRequestOperation *operation = [AFXMLRequestOperation XMLParserRequestOperationWithRequest:request success:^(NSURLRequest *request, NSHTTPURLResponse *response, NSXMLParser *XMLParser) {
        XMLParser.delegate = self;
        [XMLParser parse];
    } failure:^(NSURLRequest *request, NSHTTPURLResponse *response, NSError *error, NSXMLParser *XMLParser) {
       NSLog(@"failure with error %@",error);
   }];
    [operation start];
}


#pragma mark - Parsing lifecycle

- (void)startTheParsingProcess:(NSData *)parserData
{
    NSXMLParser *parser = [[NSXMLParser alloc] initWithData:parserData]; //parserData passed to NSXMLParser delegate which starts the parsing process

    [parser setDelegate:self];
    [parser parse]; // starts the event-driven parsing operation.
}

- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
{
    if ([elementName isEqualToString:@"yweather:astronomy"])
    {
        NSLog(@"Sunrise: %@,  Sunset: %@", [attributeDict valueForKey:@"sunrise"], [attributeDict valueForKey:@"sunset"]);
    }

}

- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string{
    self.tmpInnerTagText = string; // Make a temp NSString to store the text in-between tags
}

- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
{
    if ([elementName isEqualToString:@"title"])
    {
        NSLog(@"%@", self.tmpInnerTagText);
    }
    if ([elementName isEqualToString:@"description"])
    {
        NSLog(@"%@", self.tmpInnerTagText);
    }
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(NSError *)parseError
{
    NSLog(@"Paser Error = %@", parseError);
    //TODO: Create Alert message error
}

为了让 AFNetworking 支持您正在使用的 RSS xml，我必须按照以下站点的说明将“application/rss+xml”添加到可接受的内容类型中：http: //www.suushmedia.com/simple-rss-reader-with -af网络/

希望这可以帮助

于 2013-02-20T20:26:01.810 回答
0

更好的解决方案：我在这里找到

NSPropertyListFormat format;
NSArray *myObjects = [NSPropertyListSerialization propertyListWithData:responseObject options:NSPropertyListMutableContainers format:&format error:NULL];

    //If the root object of the plist is dictionary

NSDictionary *myObjects = [NSPropertyListSerialization propertyListWithData:responseObject options:NSPropertyListMutableContainers format:&format error:NULL];
于 2014-06-03T05:36:01.937 回答