How To Use Xml In Ios

 - (void)viewDidLoad

   {
      NSURL *url = [[NSURL alloc]initWithString:@"yourURL"];
        NSXMLParser *parser = [[NSXMLParser alloc]initWithContentsOfURL:url];
        [parser setDelegate:self];
       BOOL result = [parser parse];
   }

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


        NSLog(@\"Did start element\");
    if ( [elementName isEqualToString:@"root"])
     {
        NSLog(@"found rootElement");
        return;
    }
    }

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

 elementName namespaceURI:(NSString *)namespaceURI qualifiedName:(NSString *)qName
    {
        NSLog(@"Did end element");
        if ([elementName isEqualToString:@"root"])
            {
              NSLog(@"rootelement end");
            }

    }
    - (void)parser:(NSXMLParser *)parser foundCharacters:(NSString *)string
    {
        NSString *tagName = @"column";

       if([tagName isEqualToString:@"column"])
      {
           NSLog(@"Value %@",string);
      }

    }



down vote
   

This is how you can use NSXMLParser :

In your .h file declare :

NSMutableData       *webPortFolio;
NSMutableString     *soapResultsPortFolio;
NSURLConnection     *conn;

//---xml parsing---

NSXMLParser         *xmlParserPortFolio;
BOOL                elementFoundPortFolio;
NSMutableURLRequest *req;

NSString            *theXMLPortFolio;
NSString            *strSoapMsg;
UIAlertView         *alertView;











n your .m file use the following code:

-(void)callURL
{

     //Your logic to call URL.

     conn = [[NSURLConnection alloc] initWithRequest:req delegate:self];
     if (conn)
     {
         webPortFolio = [[NSMutableData data] retain];
     }
}
And to handle the response you can use following functions :

-(void)connection:(NSURLConnection *)connection

didReceiveResponse:(NSURLResponse *)response
{
    [webPortFolio setLength:0];    
}

-(void)connection:(NSURLConnection *)connection

didReceiveData:(NSData *)data
{
    [webPortFolio appendData:data];
}

-(void) connection:(NSURLConnection *) connection didFailWithError:(NSError *) error
{

    NSLog(@"error...................%@",[error description]);
    [webPortFolio release];
    [connection release];
}

-(void) connectionDidFinishLoading:(NSURLConnection *) connection
{

    //Check the request and returns the response.

    NSLog(@"DONE. Received Bytes: %d", [webPortFolio length]);

    theXMLPortFolio = [[NSString alloc]
                      initWithBytes: [webPortFolio mutableBytes]
                      length:[webPortFolio length]
                      encoding:NSUTF8StringEncoding];

    //---shows the XML---

    NSLog(@"shows the XML %@",theXMLPortFolio);
    [theXMLPortFolio release];   

    if(xmlParserPortFolio)
    {
        [xmlParserPortFolio release];
    }
    xmlParserPortFolio = [[NSXMLParser alloc] initWithData: webPortFolio];
    [xmlParserPortFolio setDelegate: self];
    [xmlParserPortFolio setShouldResolveExternalEntities:YES];
    [xmlParserPortFolio parse];
    [webPortFolio release];
    [connection release];
}

//---when the start of an element is found---
-(void)  parser:(NSXMLParser *) parser
didStartElement:(NSString *) elementName
   namespaceURI:(NSString *) namespaceURI
  qualifiedName:(NSString *) qName
     attributes:(NSDictionary *) attributeDict
{

    if( [elementName isEqualToString:@"your_tag_name"])
    {
        if (!soapResultsPortFolio)
        {
            soapResultsPortFolio = [[NSMutableString alloc] init];
        }
        elementFoundPortFolio = TRUE;
        NSLog(@"Registration...%@",soapResultsPortFolio);
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {
        elementFoundPortFolio = TRUE;
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {
        elementFoundPortFolio = TRUE;
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {
        elementFoundPortFolio = TRUE;
    }

}

-(void)parser:(NSXMLParser *) parser foundCharacters:(NSString *)string
{
    if (elementFoundPortFolio)
    {
        [soapResultsPortFolio appendString: string];
    }     
}

- (void)parser:(NSXMLParser *)parser parseErrorOccurred:(

 NSError *)parseError
{
    NSLog(@"Parser error %@ ",[parseError description]);
}


//---when the end of element is found---
-(void)parser:(NSXMLParser *)parser
didEndElement:(NSString *)elementName
 namespaceURI:(NSString *)namespaceURI
qualifiedName:(NSString *)qName
{
    if ([elementName isEqualToString:@"your_tag_name"])
    {         
        NSLog(@"display the soap results%@",soapResultsPortFolio);
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {         
        //Perform required action
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {
        //Perform required action
    }
    else if([elementName isEqualToString:@"your_tag_name"])
    {
        //Perform required action
    }

    [soapResultsPortFolio setString:@""];
    elementFoundPortFolio = FALSE;
}