另一个对等方接收的PeerID对象与MultipeerConnectivity Framework中的原始对象不同

Question

我正在使用Multipeer Connectivity框架。我正在NSUserDefaults中保存我的PeerId以重复使用它（如Apple建议的那样）（下面的代码是swift但是Objective c也有相同的行为）。 ：

        var peerId: MCPeerID = {
        let defaults = NSUserDefaults.standardUserDefaults();
        let dataToShow = defaults.dataForKey("kPeerID");
        var peer = NSKeyedUnarchiver.unarchiveObjectWithData(dataToShow) as? MCPeerID;
        if peer == nil {
            peer = MCPeerID(displayName: UIDevice.currentDevice().name);
            let data: NSData = NSKeyedArchiver.archivedDataWithRootObject(peer);
            defaults.setObject(data, forKey: "kPeerID");
            defaults.synchronize();
        }
        println("I am peer: \(peer!)");
        return peer!;
    }()

我将邀请发送给发现的同行，如下所示：

func browser(browser: MCNearbyServiceBrowser!, foundPeer peerID: MCPeerID!, withDiscoveryInfo info: [NSObject : AnyObject]!) {    
    println("\(self.peerId) Found peer \(peerID)");
    if let browserSession = self.session {
        browserSession.delegate = self;
        browser.invitePeer(peerID, toSession: browserSession, withContext: nil, timeout: 30);
    }else {
        println("Browser session is nil");
   }    
}

广告商使用代码找到它：

func advertiser(advertiser: MCNearbyServiceAdvertiser!, didReceiveInvitationFromPeer peerID: MCPeerID!, withContext context: NSData!, invitationHandler: ((Bool, MCSession!) -> Void)!) {
    println("\(self.peerId) Received Invitation from \(peerID)");
    var session = availableSession();
    invitationHandler(true, session);
}

我面临的问题是：当广告客户找到peerId时，它会显示与原始peerId不同的peerId，但具有正确的显示名称。

浏览器控制台输出是：

  I am peer: <MCPeerID: 0x1663e670 DisplayName = Jon Yang’s iPad>
  <MCPeerID: 0x1663e670 DisplayName = Jon Yang’s iPad> Received Invitation from <MCPeerID: 0x1666daf0 DisplayName = Jon Yang’s iPadMini>
  <MCPeerID: 0x1663e670 DisplayName = Jon Yang’s iPad> Connecting with <MCPeerID: 0x1666daf0 DisplayName = Jon Yang’s iPadMini>
  <MCPeerID: 0x1663e670 DisplayName = Jon Yang’s iPad> Connected with <MCPeerID: 0x1666daf0 DisplayName = Jon Yang’s iPadMini>

和广告商控制台输出是：

 I am peer: <MCPeerID: 0x1569d230 DisplayName = Jon Yang’s iPadMini>
 <MCPeerID: 0x1569d230 DisplayName = Jon Yang’s iPadMini> Found peer <MCPeerID: 0x15586600 DisplayName = Jon Yang’s iPad>
 <MCPeerID: 0x1569d230 DisplayName = Jon Yang’s iPadMini> Connecting with <MCPeerID: 0x15586600 DisplayName = Jon Yang’s iPad>
 <MCPeerID: 0x1569d230 DisplayName = Jon Yang’s iPadMini> Connected with <MCPeerID: 0x15586600 DisplayName = Jon Yang’s iPad>

正如您所看到的，即使Browser和Advertiser有他们的peerId信息，当他们被其他对等方接收时，他们的peerId也是不同的。有谁能解释一下？有什么我做错了吗？

Answer 1

 <MCPeerID: 0x1663e670 DisplayName = Jon Yang’s iPad>

0x1663e670表示当前设备上MCPeerID对象的内存地址。不要将它与框架引用的实际MCPeerID对象混淆。只要displayName符合预期，那么它就是正确的同伴。