ios - GKPeerPicker Controller 中出现重复的对等名称

Question

如果我在我的两个 ios 设备上多次连接和断开蓝牙，我会得到重复的对等名。

有没有办法在 gkpeerpickercontroller 中为蓝牙聊天应用程序获取唯一对等点的单一名称。

同时附上截图。

我使用下面的代码来显示 GKPeerPickerController。

---

-(IBAction)btnConnectClicked:(id)sender
 {
    [self openPeerPickerController];
 }

-(IBAction)btnDisconnectClicked:(id)sender
{
    [currentSession disconnectFromAllPeers];
}
-(void)openPeerPickerController
{
    if (!currentSession)
    {
        GKPeerPickerController *peerPicker2 = [[GKPeerPickerController alloc] init];
        peerPicker2.delegate = self;
        peerPicker2.connectionTypesMask = GKPeerPickerConnectionTypeNearby;
        [peerPicker2 show];
    }
}

-(void)peerPickerController:(GKPeerPickerController *)picker didConnectPeer:(NSString *)peerID toSession:(GKSession *) session
{
    NSLog(@"Peer session connected");
    //set session delegate and dismiss the picker
    session.delegate = self;
    currentSession = session;
picker.delegate = nil;
    [picker dismiss];
}
- (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type
{
    //create ID for session
    NSString *sessionIDString = @"MTBluetoothSessionID";
    //create GKSession object
    GKSession *session = [[GKSession alloc] initWithSessionID:sessionIDString displayName:nil sessionMode:GKSessionModePeer];
    return session;
}

-(void)peerPickerControllerDidCancel:(GKPeerPickerController *)picker
{
    NSLog(@"Peer cancelled");
    [currentSession disconnectFromAllPeers];
    currentSession=nil;
    picker.delegate = nil;
}
-(void)session:(GKSession *)session peer:(NSString *)peerID didChangeState:(GKPeerConnectionState)state
{
    switch (state)
    {
        case GKPeerStateAvailable:
        {
           // not connected to session, but available for connectToPeer:withTimeout:
        }
        break;

        case GKPeerStateUnavailable:
        {
            // no longer available
        }
            break;

        case GKPeerStateConnected:
        {
            // connected to the session
            [currentSession setDataReceiveHandler:self withContext:nil]; //set ViewController to receive data
        }
            break;

        case GKPeerStateDisconnected:
        {
            // disconnected from the session
            currentSession.delegate = nil;
            currentSession = nil; //allow session to reconnect if it gets disconnected
        }
            break;

        case GKPeerStateConnecting:
        {
            // waiting for accept, or deny response
        }
            break;

        default:
            break;
    }
}

Answer 1

你的 GKPeerPickerControllerDelegate 方法

- (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type

每次返回一个新 session 。在您的情况下，它被调用两次，因此创建了两个 session 。来自文档:

When the peer picker needs a session, it calls this method. Your application can either create a new session or return a previously created session to the peer picker.

因此您可以将 session 声明为一个属性并编写一个 getter 并在委托(delegate)中返回 session 属性，这将避免创建多个 session

@property (nonatomic, string) GKSession *session;
#define sessionIDString @"MTBluetoothSessionID"

- (GKSession) session {
    if(!_session) {
        //create GKSession object
        _session = [[GKSession alloc] initWithSessionID:sessionIDString displayName:nil sessionMode:GKSessionModePeer];
    }
    return _session;
}

并将委托(delegate)方法更改为:

- (GKSession *)peerPickerController:(GKPeerPickerController *)picker sessionForConnectionType:(GKPeerPickerConnectionType)type {
    return self.session;
}

确保在完成后取消 session 。