使用AFNetworking解析XML文件 [英] Parsing an XML file with AFNetworking

问题描述

我正在使用Yahoo api创建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。

I am making a little weather app using the Yahoo api. This api gives me an XML file back. My problem is now how I can parse this file ? Here is my code that I have so far.

 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);
    }];

您可以在这里。

希望有人能帮助我

推荐答案

如果您希望使用NSXMLParser解析XML，则需要一个实现NSXMLParserDelegate的类。你可以使用你的ViewController：

If you are looking to parse XMLs using NSXMLParser you'll need to have a class that implements the NSXMLParserDelegate. You can use your ViewController for this:

@interface ViewController : UIViewController <NSXMLParserDelegate>

然后使用此协议提供的SAX方法，您可以在运行<$ c $时解析此XML c> [XMLParser parse] 。以下是xml的示例：

Then using the SAX methods provided by this protocol you can parse this XML when you run [XMLParser parse]. Here is an example for your xml:

- (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
}

同时获取AFNetworking为了支持您正在使用的RSS xml，我必须按照本网站的说明将application / rss + xml添加到acceptableContentTypes： http://www.suushmedia.com/simple-rss-reader-with-afnetworking/

Also to get AFNetworking to support the RSS xml you are using I had to add "application/rss+xml" to the acceptableContentTypes following the instructions from this site: http://www.suushmedia.com/simple-rss-reader-with-afnetworking/

希望这有帮助

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