about Game Center's [Finding a Match Programmatically] - ios

Question

My project need a online play.
GKMatchRequest *request = [[[GKMatchRequest alloc] init] autorelease];
request.minPlayers = 2;
request.maxPlayers = 2;
GKMatchmakerViewController *mmvc = [[[GKMatchmakerViewController alloc] initWithMatchRequest:request] autorelease];
mmvc.matchmakerDelegate = self;
[presentingViewController presentModalViewController:mmvc animated:YES];
the above code made a GameCenter view,if i press button named"Play now",it will call "GKMatchDelegate's [- (void)match:(GKMatch *)theMatch player:(NSString *)playerID didChangeState:(GKPlayerConnectionState)state]", its works ok.
but now, i need use "Finding a Match Programmatically", find match directly with out the official view.
[[GKMatchmaker sharedMatchmaker]findMatchForRequest:request withCompletionHandler:^(GKMatch *hasmatch, NSError *error) {
if(error)
{
NSLog(#"has error match!!!");
}
else if(hasmatch)
{
NSLog(#"has match!!!");//in test we really find the match.
[presentingViewController dismissModalViewControllerAnimated:YES];
self.match = hasmatch;
self.match.delegate = self;
}
}];
now the "GKMatchDelegate's [- (void)match:(GKMatch *)theMatch player:(NSString *)playerID didChangeState:(GKPlayerConnectionState)state]" didn't work.
what should i do,to start the online match?
- (void)match:(GKMatch *)theMatch player:(NSString *)playerID didChangeState:(GKPlayerConnectionState)state {
if (self.match != theMatch) return;
switch (state) {
case GKPlayerStateConnected:
// handle a new player connection.
NSLog(#"Player connected!");
if (!matchStarted && theMatch.expectedPlayerCount == 0) {
NSLog(#"Ready to start match!");
[self lookupPlayers];//i start game here
}
break;
case GKPlayerStateDisconnected:
// a player just disconnected.
NSLog(#"Player disconnected!");
matchStarted = NO;
[delegate matchEnded];
break;
}
}