對JSON習(xí)以為常之后，使用XML多少有點(diǎn)不習(xí)慣。其實(shí)二者差不多。這里講述一下iOS自帶的NSXMLParserDelegate的使用。

1.頭文件中聲名協(xié)議<NSXMLParserDelegate>，定義兩個(gè)方法：-(void)postRequest 和 -(void)startParser:(NSData*)_data

2.源文件中實(shí)現(xiàn)，代碼如下：

[objc]?view plaincopyprint?

-(void)postRequest??

{??

????//prepar?request??

????NSString?*urlString?=?[NSString?stringWithFormat:@"http://122.113.26.11/golive/api/loadRegionList.do"];??

????NSMutableURLRequest?*request?=?[[NSMutableURLRequest?alloc]?init]?;??

????[request?setURL:[NSURL?URLWithString:urlString]];??

????[request?setHTTPMethod:@"POST"];??

??????

????//set?headers?設(shè)置contentType和HTTPHeaderField??

????NSString?*contentType?=?[NSString?stringWithFormat:@"text/xml"];??

????[request?addValue:contentType?forHTTPHeaderField:?@"Content-Type"];??

??????

????//create?the?body?在此處拼接XML字段，將每段尖括號的內(nèi)容拆開拼接起來??

????NSMutableData?*postBody?=?[NSMutableData?data];??

????//????[postBody?appendData:[[NSString?stringWithFormat:@"<xml>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"<?xml?version=\"1.0\"?encoding=\"utf-8\"?>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"<request?website=\"http://XXXXXXXXXXXXXX\">"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"<device?devmodel=\"\"?dnum=\"\"?didtoken=\"\"?dver=\"\"/>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"<live?mac=\"XXXXX\"?deviceid=\"\"?livetoken=\"\"?livever=\"\"/>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"</parameter>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

????[postBody?appendData:[[NSString?stringWithFormat:@"</request>"]?dataUsingEncoding:NSUTF8StringEncoding]];??

???

????//post??

????[request?setHTTPBody:postBody];??

??????

????//get?response??

????NSHTTPURLResponse*?urlResponse?=?nil;??

????NSError?*error?=?[[NSError?alloc]?init];??

????self.responseData?=?[NSURLConnection?sendSynchronousRequest:request?returningResponse:&urlResponse?error:&error];??

????NSString?*result?=?[[NSString?alloc]?initWithData:responseData?encoding:NSUTF8StringEncoding];??

????NSLog(@"regionResponse?Code:?%ld",?(long)[urlResponse?statusCode]);??

??

????if?([urlResponse?statusCode]?>=?200?&&?[urlResponse?statusCode]?<?300)?{??

????????NSLog(@"regionResponse:?%@",?result);??

??????????

????????//這里獲取到服務(wù)器返回的內(nèi)容??

??????????

????}??

??????

????NSString*?aStr;??

????aStr?=?[[NSString?alloc]?initWithData:postBody?encoding:NSASCIIStringEncoding];??

????NSLog(@"reg==========%@",aStr);??

}??

??

//自定義一個(gè)?PraxMovie?方法，參數(shù)時(shí)NSDate型的數(shù)據(jù)，用來傳遞接受到的數(shù)據(jù)??

-?(void)startParser:(NSData*)data??

{??

????//NSXMLParser解析xml格式的數(shù)據(jù)，在這里初始化，并賦值??

????NSXMLParser*?parser?=?[[NSXMLParser?alloc]initWithData:data];??

????parser.delegate?=?self;??

????[parser?parse];??

????NSLog(@"解析完成。。。");??

}??

??

//文檔出錯(cuò)的時(shí)候觸發(fā)??

-?(void)parser:(NSXMLParser?*)parser?parseErrorOccurred:(NSError?*)parseError??

{??

????NSLog(@"%@",parseError);??

}??

??

//遇到一個(gè)開始標(biāo)簽時(shí)候觸發(fā)??

-?(void)parser:(NSXMLParser?*)parser?didStartElement:(NSString?*)elementName??

??namespaceURI:(NSString?*)namespaceURI??

?qualifiedName:(NSString?*)qualifiedName??

????attributes:(NSDictionary?*)attributeDict??

{??

????self.currentTagName?=?elementName;??

????//region是需要解析的內(nèi)容所對應(yīng)的字段??

????if?([currentTagName?isEqualToString:@"region"])?{?????????

????//name和code是需要解析的內(nèi)容所對應(yīng)的字段??

????????[self.name?addObject:[attributeDict?objectForKey:@"name"]];??

????????[self.code?addObject:[attributeDict?objectForKey:@"code"]];??

????????[self.regionDic?setObject:[attributeDict?objectForKey:@"code"]?forKey:[attributeDict?objectForKey:@"name"]];??

??????????

????????NSLog(@"language:%@;code:%@",[attributeDict?objectForKey:@"name"],[attributeDict?objectForKey:@"code"]);??

????}??

??????

}??

??

//遇到結(jié)束標(biāo)簽時(shí)候出發(fā)??

-?(void)parser:(NSXMLParser?*)parser?didEndElement:(NSString?*)elementName??

??namespaceURI:(NSString?*)namespaceURI??

?qualifiedName:(NSString?*)qName;??

{??

????self.currentTagName?=?nil;??

}??

這樣就OK了，成功獲取到后臺(tái)數(shù)據(jù)并解析成所需要的內(nèi)容。

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