/*-------------------------------------------------------------
	 * DECLORATION
	 *------------------------------------------------------------*/
	 
NSMutableDictionary *receivedData;

	/*-------------------------------------------------------------
	 * IMPLEMENTATION
	 *------------------------------------------------------------*/
	 
	 - (void)startAsyncLoad:(NSURL*)url tag:(NSString*)tag {
   NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url];
   CustomURLConnection *connection = [[CustomURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES tag:tag];
 
   if (connection) {
      [receivedData setObject:[[NSMutableData data] retain] forKey:connection.tag];
   }
}
 
- (NSMutableData*)dataForConnection:(CustomURLConnection*)connection {
   NSMutableData *data = [receivedData objectForKey:connection.tag];
   return data;
}
 
- (void)load {
   receivedData = [[NSMutableDictionary alloc] init];
 
   NSURL *url1 = [NSURL URLWithString:@"http://blog.emmerinc.be"];
   NSURL *url2 = [NSURL URLWithString:@"http://www.emmerinc.be"];
   NSURL *url3 = [NSURL URLWithString:@"http://twitter.com/emmerinc"]; 
 
   [self startAsyncLoad:url1 tag:@"tag1"];
   [self startAsyncLoad:url2 tag:@"tag2"];
   [self startAsyncLoad:url3 tag:@"tag3"];
}
 
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response {
   NSMutableData *dataForConnection = [self dataForConnection:(CustomURLConnection*)connection];
   [dataForConnection setLength:0];
}
 
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
   NSMutableData *dataForConnection = [self dataForConnection:(CustomURLConnection*)connection];
   [dataForConnection appendData:data];
}
 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection {
   NSMutableData *dataForConnection = [self dataForConnection:(CustomURLConnection*)connection];
   [connection release];
 
   // Do something with the dataForConnection.
}

	/*-------------------------------------------------------------
	 * CUSTOM NSURLCONNECTION CLASS
	 *------------------------------------------------------------*/
	 
	 @interface CustomURLConnection : NSURLConnection {
   NSString *tag;
}
 
@property (nonatomic, retain) NSString *tag;
 
- (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate startImmediately:(BOOL)startImmediately tag:(NSString*)tag;
 
@end

	/*-------------------------------------------------------------
	 * IMPLEMENTATION
	 *------------------------------------------------------------*/

@implementation CustomURLConnection
 
@synthesize tag;
 
- (id)initWithRequest:(NSURLRequest *)request delegate:(id)delegate startImmediately:(BOOL)startImmediately tag:(NSString*)tag {
   self = [super initWithRequest:request delegate:delegate startImmediately:startImmediately];
 
   if (self) {
      self.tag = tag;
   }
   return self;
}
 
- (void)dealloc {
   [tag release];
   [super dealloc];
}
 
@end

Multiple async NSURLConnections

Objective C