How to Use and access SOAP web services from ios.iphone

NSURL *sRequestURL = [NSURL URLWithString:@"http://w3schools.com/webservices/tempconvert.asmx"];
    NSMutableURLRequest *myRequest = [NSMutableURLRequest requestWithURL:sRequestURL];
    NSString *sMessageLength = [NSString stringWithFormat:@"%d", [sSOAPMessage length]];

    [myRequest addValue: @"text/xml; charset=utf-8" forHTTPHeaderField:@"Content-Type"];
    [myRequest addValue: @"http://www.w3schools.com/webservices/CelsiusToFahrenheit" forHTTPHeaderField:@"SOAPAction"];
    [myRequest addValue: sMessageLength forHTTPHeaderField:@"Content-Length"];
    [myRequest setHTTPMethod:@"POST"];
    [myRequest setHTTPBody: [sSOAPMessage dataUsingEncoding:NSUTF8StringEncoding]];

    NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:myRequest delegate:self];

    if( theConnection ) {
         self.webResponseData = [[NSMutableData data] retain];
    }else {
        NSLog(@"Some error occurred in Connection");

    }

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
     [self.webResponseData  setLength:0];
}

-(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
     [self.webResponseData  appendData:data];
}

-(void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
     NSLog(@"Some error in your Connection. Please try again.");
}

-(void)connectionDidFinishLoading:(NSURLConnection *)connection {
     NSLog(@"Received Bytes from server: %d", [self.webResponseData length]);
     NSString *myXMLResponse = [[NSString alloc] initWithBytes: [self.webResponseData bytes] length:[self.webResponseData length] encoding:NSUTF8StringEncoding];
     NSLog(@"%@",myXMLResponse);
}