xcode iOS：NSXMLParser 获取属性
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iOS: NSXMLParser get attribute
提问by tbleckert
I'm really new to this and I'm trying to read an RSS feed, and so far everything is good. This is how I do it:
我真的很陌生，我正在尝试阅读 RSS 提要，到目前为止一切都很好。这就是我的做法：
- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {
if ([elementName isEqualToString:@"item"]) {
[item setObject:currentTitle forKey:@"title"];
[item setObject:currentLink forKey:@"link"];
[item setObject:currentSummary forKey:@"summary"];
[item setObject:currentDate forKey:@"date"];
[item setObject:currentImage forKey:@"enclosure"];
[stories addObject:[item copy]];
NSLog(@"adding story: %@", currentTitle);
}
}
The problem is the enclosure. Which looks like this in the XML:
问题是外壳。在 XML 中看起来像这样：
<enclosure length="150" url="urltoimage.jpg" type="image/jpeg" />
How do I get urlattribute from that element from within my function?
如何从我的函数中从该元素获取url属性？
EDITThe XML looks like this:
编辑XML 如下所示：
<item>
<title>...</title>
<link>...</link>
<description>...</description>
<pubDate>...</pubDate>
<enclosure length="150" url="urltoimage.jpg" type="image/jpeg" />
</item>
And my foundCharacters function looks like this:
我的 foundCharacters 函数如下所示：
- (void)parser: (NSXMLParser *)parser foundCharacters:(NSString *)string {
if ([currentElement isEqualToString:@"title"]) {
[currentTitle appendString:string];
} else if ([currentElement isEqualToString:@"link"]) {
[currentLink appendString:string];
} else if ([currentElement isEqualToString:@"description"]) {
[currentSummary appendString:string];
} else if ([currentElement isEqualToString:@"pubDate"]) {
[currentDate appendString:string];
}
}
回答by Tendulkar
- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qualifiedName
attributes:(NSDictionary *)attributeDict
{
// just do this for item elements
if(![elementName isEqual:@"enclosure"])
return;
// then you just need to grab each of your attributes
NSString * name = [attributeDict objectForKey:@"url"];
// ... get the other attributes
// when we have our various attributes, you can add them to your arrays
[m_NameArray addObject:name];
// ... same for the other arrays
}
回答by Denis
You have to handle one more callback for tracking attributes:
您必须再处理一个用于跟踪属性的回调：
- (void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qualifiedName attributes:(NSDictionary *)attributeDict
attributeDictis dictionary with all found element arguments
attributeDict是包含所有找到的元素参数的字典
