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    <p>You create your parser, but you don't parse. Let's assume you created your parser like so:</p> <pre><code>NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; </code></pre> <p>You then need to set the delegate and initiate the parse:</p> <pre><code>parser.delegate = self; [parser parse]; </code></pre> <p>You then have to write your <a href="http://developer.apple.com/library/ios/#documentation/cocoa/reference/NSXMLParserDelegate_Protocol/Reference/Reference.html" rel="nofollow"><code>NSXMLParserDelegate</code></a> methods. (For more information on <code>NSXMLParser</code>, see the <a href="http://developer.apple.com/library/ios/documentation/cocoa/Conceptual/XMLParsing/XMLParsing.html#//apple_ref/doc/uid/10000186i" rel="nofollow">Event-Driven XML Programming Guide</a>.) E.g., if you only need temperature, you could write a <code>didStartElement</code> method:</p> <pre><code>- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"yweather:condition"]) { // do whatever you want with `attributeDict`, perhaps saving it in some class property; I'm just going to log it NSLog(@"current condition = %@", attributeDict); } } </code></pre> <p>Note, the city should be a WOEID. (See the <a href="http://developer.yahoo.com/weather/" rel="nofollow">API description</a>.) So, instead of a location of:</p> <pre><code>NSString *location = @"Palermo"; </code></pre> <p>You should use (for Palermo in Italy):</p> <pre><code>NSString *location = @"719846"; </code></pre> <hr> <p>By the way, I agree with Caleb that you should either do this <code>initWithContentsOfURL</code> in a background queue, or you should otherwise retrieve the <code>NSData</code> using some asynchronous mechanism.</p> <p>For example, you could do:</p> <pre><code>dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{ NSString *location = @"719846"; NSString *temperatureUnit = @"c"; NSString *address = @"http://weather.yahooapis.com/forecastrss?w="; NSString *request = [NSString stringWithFormat:@"%@%@&amp;u=%@",address,location, temperatureUnit]; NSURL *URL = [NSURL URLWithString:request]; NSXMLParser *parser = [[NSXMLParser alloc] initWithContentsOfURL:URL]; parser.delegate = self; [parser parse]; }); </code></pre> <p>If you do this in the background queue, make sure to dispatch UI updates back to the main queue, e.g.:</p> <pre><code>- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { if ([elementName isEqualToString:@"yweather:condition"]) { // UI updates should be dispatched back to the main queue, e.g.: dispatch_async(dispatch_get_main_queue(), ^{ NSString *temp = attributeDict[@"temp"]; self.tempLabel.text = temp; }); } } </code></pre>
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    1. POYahoo weather API using NSXMLParser
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    1. COIt works perfectly! I hope this will help other people
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      1. USMassimo Piazza
 

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