set flag before connection start - ios

Question

in viewDidLoad I want to call webservice for several times.
So my code in viewDidLoad is as follows
//Webservice call for industry list
NSURL *aUrl = [NSURL URLWithString:[NSString stringWithFormat:#"%#index.php/industry/industrylist",baseurl]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:aUrl
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[request setHTTPMethod:#"POST"];
[request setHTTPBody:[#"emailid=b#b.com&password=1234" dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *connection= [[NSURLConnection alloc] initWithRequest:request delegate:self];
//set flag for industryList
flag = #"industry";
[connection start];
//Webservice call for function list
NSURL *bUrl = [NSURL URLWithString:[NSString stringWithFormat:#"%#index.php/functionmdl/allFunctionlist",baseurl]];
NSMutableURLRequest *requestb = [NSMutableURLRequest requestWithURL:bUrl
cachePolicy:NSURLRequestUseProtocolCachePolicy
timeoutInterval:60.0];
[requestb setHTTPMethod:#"POST"];
[requestb setHTTPBody:[#"" dataUsingEncoding:NSUTF8StringEncoding]];
NSURLConnection *connectionb = [[NSURLConnection alloc] initWithRequest:requestb delegate:self];
//set flag for industryList
flag = #"functionmdl";
[connectionb start];
But the value of flag is always set to functionmdl because i have assigned the flag with the string at the just previous line of the last line in the above code. I know that i am setting the flag in wrong way. So, please let me know how can i set flag here. Basically i want to use these flag in connectionDidFinishLoading method.
i have to differentiate the webservice response data according to webservice call.
Please help me to resolve this.

Answer 1

I think you can use the connection.currentRequest.URL to distinguish the request.
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
NSString *strUrl = [connection.currentRequest.URL absoluteString] ;
// compare to the url of your request to distinguish them
}

Answer 2

There are several approaches here (none involve a flag).
The easiest is typically to use [NSURLConnection sendAsynchronousRequest:queue:completionHandler]. Then you can put your connectionDidFinishLoading code right here, specific to each request.
That doesn't work if you need more advanced features of NSURLConnectionDelegate (like responding to authentication requests). In that case, I usually recommend that you wrap up the connection and delegate into a separate object, and instantiate one for each connection. That way each object is only delegate for a single connection.
In a small number of cases, this still isn't appropriate, and in those cases you can check the connection's request in the delegate (connection.currentRequest) to determine which one you're being called about. In some cases, I've created a mutable dictionary property mapping NSURLRequest information to some other piece of metadata I wanted in the handlers.
And in the most fancy (and therefore least-often used) case, you can attach metadata (such as an identifier) to your connection using objc_setAssociatedObject, but this is seldom necessary.
But I'd look at [NSURLConnection sendAsynchronousRequest:queue:completionHandler]. It's the simplest to use and addresses the most common cases easily.