IOS Study Notes (9)-xml data parsing

This article uses NSXMLParser.

 

 

 

NSXMLParser * parser = [[NSXMLParser alloc] initWithData: [xml dataUsingEncoding: encoding]; // NSXMLParser * parser = [[NSXMLParser alloc] parser: [NSURL URLWithString: @ "http://earthquake.usgs.gov/earthquakes/catalogs/7day-M2.5.xml"]; [parser setDelegate: self]; // set the NSXMLParser object's resolution proxy [parser setShouldProcessNamespaces: NO]; [parser parse]; // start Parsing

2. Delegate Method

 

 

// The processing function that discovers the element start character (that is, the start of the report element and the attribute of the element)-(void) parser :( NSXMLParser *) parser didStartElement :( NSString *) elementName namespaceURI :( NSString *) namespaceURI qualifiedName :( NSString *) qName attributes :( NSDictionary *) attributeDict // processing tag contains content characters (all or part of the report element)-(void) parser :( NSXMLParser *) parser foundCharacters :( NSString *) string // The processing function that discovers the element Terminator and stores the data of each element Project (that is, the end mark of the report element)-(void) parser :( NSXMLParser *) parser didEndElement :( NSString *) elementName namespaceURI :( NSString *) namespaceURI qualifiedName :( NSString *) qName // report resolution end-(void) Complete :( NSXMLParser *) parser // report unrecoverable parsing errors-(void) paser: parsererroccured

 

After [parser parse] is executed, it is executed in sequence:

 

-(void)parser:(NSXMLParser *)parser didStartElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName attributes:(NSDictionary *)attributeDict {        NSLog(@"xml_parser start %@ ",elementName);    if ( [elementName isEqualToString:@"person"] ) {        NSLog(@"xml_parser person ");        if(personNameArrary==nil){            personNameArrary=[[NSMutableArray alloc] init];        }    }        if(itemValue!=nil){            itemValue=nil;        }        itemValue=[[NSMutableString alloc] init];        if ( [elementName isEqualToString:@"phone"] ) {          NSString *atr=[attributeDict valueForKey:@"type"];        NSLog(@"xml_parser phone type: %@",atr);    }}- (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string {        NSLog(@"xml_parser value:%@",string);    [itemValue appendString:string];}- (void)parser:(NSXMLParser *)parser didEndElement:(NSString *)elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName {    NSLog(@"xml_parser end %@ ",elementName);    if ( [elementName isEqualToString:@"firstName"] ) {        [personNameArrary addObject:itemValue];    }        if ( [elementName isEqualToString:@"person"] ) {        NSLog(@"xml_parser person end");    }    }

Download NSXMLParser DEMO

 

 

@ Zhang xingye TBOW

Http://www.cnblogs.com/dotey/archive/2011/05/11/2042000.html

 

Https://developer.apple.com/library/ios/#documentation/Cocoa/Conceptual/XMLParsing/Articles/HandlingElements.html#//apple_ref/doc/uid/20002265-BCIJFGJI

Http://www.raywenderlich.com/553/how-to-chose-the-best-xml-parser-for-your-iphone-project #