Multipeer Connectivity Disconnect

问题

I'm having trouble with staying connected using the Multipeer Connectivity Framework in iOs7. Currently my app is programmatically handling the browsing and advertising using MCNearbyServiceAdvertiser and MCNearbyServiceBrowser. I have an alert view that asks the user if he is a browser or an advertiser. On the return from that view I instantiate either an MCNearbyServiceAdvertiser or Browser accordingly.

#pragma - Alert Delegate
-(void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 0)
    {
        _browser = [[MCNearbyServiceBrowser alloc]initWithPeer:_peerID serviceType:@"Context-xl"];
        [_browser setDelegate:self];
        [self.detailViewController setRemote:YES];
        [_browser startBrowsingForPeers];
    } else
    {
        _advertiser = [[MCNearbyServiceAdvertiser alloc]initWithPeer:_peerID discoveryInfo:nil serviceType:@"Context-xl"];
        [_advertiser setDelegate:self];
        [self.detailViewController setRemote:NO];
        [_advertiser startAdvertisingPeer];
    }
    [self.detailViewController configureView];
}

My session delegate method peer:...DidChangeState... is getting called twice, once for the connect and again for the disconnect. I'm not stopping the advertiser or browser at all after the session is started. Should I stop browsing/advertising?

回答1:

EDIT Used a support ticket with Apple and they confirmed that calling sendData with too much data or too often can cause disconnects.

EDIT My hypothesis is that Apple has a thread or queue that is polling to check if peers are connected. If this thread / queue stalls (i.e. a breakpoint is hit or the app pegs the CPU or does something that takes a while on the main thread) it appears that this causes a disconnect.

Creating my session without encryption seems to have helped performance and with the disconnects, although they still happen.

MCPeerID* peerId = [[MCPeerID alloc] initWithDisplayName:self.displayName];
self.peer = [[MultiPeerPeer alloc] initWithDisplayName:peerId.displayName andPeer:peerId];
self.session = [[MCSession alloc] initWithPeer:peerId securityIdentity:nil encryptionPreference:MCEncryptionNone];

In addition, I have found calling sendData too often (more than 30-60 times a second) can cause the framework to get in a bad state and cause freezes and disconnects.

来源：https://stackoverflow.com/questions/19101838/multipeer-connectivity-disconnect

标签

ios7

multipeer-connectivity