Swift：无法赋值'（Bool，MCSession） - > Void'键入'（Bool，MCSession！） - > Void！'

我试着this tutorial，因为新的swift版本出现了一些错误，其中一个是MPCManager不符合协议MCNearbyServiceAdvertiserDelegate。Swift：无法赋值'（Bool，MCSession） - > Void'键入'（Bool，MCSession！） - > Void！'

我试图来解决它，所以我改变FUNC广告客户的首标到这一个：

FUNC广告（广告客户：MCNearbyServiceAdvertiser， didReceiveInvitationFromPeer的peerID：MCPeerID，withContext上下文： NSData的?, invitationHandler：（布尔，MCSession） - >无效）{

，但随后引发我一个错误

无法赋值'（Bool，MCSession） - >无效'键入'（Bool， MCSession！） - > Void！'

我不知道如何解决，帮助赞赏！

实际文件：

import UIKit 
    import MultipeerConnectivity 

    protocol MPCManagerDelegate { 
     func foundPeer() 

     func lostPeer() 

     func invitationWasReceived(fromPeer: String) 

     func connectedWithPeer(peerID: MCPeerID) 
    } 

    class MPCManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate { 
     var session: MCSession! 
     var peer: MCPeerID! 
     var browser: MCNearbyServiceBrowser! 
     var advertiser: MCNearbyServiceAdvertiser! 

     var foundPeers = [MCPeerID]() 
     var invitationHandler: (Bool, MCSession!)->Void! 
     var delegate: MPCManagerDelegate? 

     override init() { 
      super.init() 

      invitationHandler(false, nil) 

      peer = MCPeerID(displayName: UIDevice.currentDevice().name) 

      session = MCSession(peer: peer) 
      session.delegate = self 

      browser = MCNearbyServiceBrowser(peer: peer, serviceType: "appcoda-mpc") 
      browser.delegate = self 

      advertiser = MCNearbyServiceAdvertiser(peer: peer, discoveryInfo: nil, serviceType: "appcoda-mpc") 
      advertiser.delegate = self 
     } 

     func browser(browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) { 
      foundPeers.append(peerID) 

      delegate?.foundPeer() 
     } 

     func browser(browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) { 
      for (index, aPeer) in EnumerateSequence(foundPeers){ 
       if aPeer == peerID { 
        foundPeers.removeAtIndex(index) 
        break 
       } 
      } 

      delegate?.lostPeer() 
     } 

     func browser(browser: MCNearbyServiceBrowser, didNotStartBrowsingForPeers error: NSError) { 
      print(error.localizedDescription) 
     } 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ THE Error occurs here: ~~~~~~~~~~~~~~~~~~~~~~ 
     func advertiser(advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: NSData?, invitationHandler: (Bool, MCSession)->Void) { 
      self.invitationHandler = invitationHandler 

      delegate?.invitationWasReceived(peerID.displayName) 
     } 

     func advertiser(advertiser: MCNearbyServiceAdvertiser, didNotStartAdvertisingPeer error: NSError) { 
      print(error.localizedDescription) 
     } 



     func session(session: MCSession, peer peerID: MCPeerID, didChangeState state: MCSessionState) { 
      switch state{ 
      case MCSessionState.Connected: 
       print("Connected to session: \(session)") 
       delegate?.connectedWithPeer(peerID) 

      case MCSessionState.Connecting: 
       print("Connecting to session: \(session)") 

      default: 
       print("Did not connect to session: \(session)") 
      } 
     } 

     func sendData(dictionaryWithData dictionary: Dictionary<String, String>, toPeer targetPeer: MCPeerID) -> Bool { 
      let dataToSend = NSKeyedArchiver.archivedDataWithRootObject(dictionary) 
      let peersArray = NSArray(object: targetPeer) as! [MCPeerID] 

      do { 
       _ = try session.sendData(dataToSend, toPeers: peersArray, withMode: MCSessionSendDataMode.Reliable) 
      } catch let error as NSError { 
       print(error.localizedDescription) 
       return false 
      } 

      return true 
     } 

     func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) { 
      let dictionary: [String: AnyObject] = ["data": data, "fromPeer": peerID] 
      NSNotificationCenter.defaultCenter().postNotificationName("receivedMPCDataNotification", object: dictionary) 
     } 

     func session(session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, withProgress progress: NSProgress) { } 

     func session(session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, atURL localURL: NSURL, withError error: NSError?) { } 

     func session(session: MCSession, didReceiveStream stream: NSInputStream, withName streamName: String, fromPeer peerID: MCPeerID) { } 

    }

来源

2015-11-03 Dror Chen

你能否把有问题的代码片段放到你的问题中？ – courteouselk

已编辑！现在呢？ –

你能解决这个问题吗？ – Gamerlegend

您与(Bool, MCSession!)->Void!类型定义的变量invitationHandler，然后用值(Bool, MCSession)->Void)类型分配它。这是导致错误信息的原因。

要解决该问题，请使用参数匹配类型和invitationHandler变量定义advertiser方法。

来源

2015-11-04 01:58:02 t4nhpt

如果我这样做，我再次显示第一个错误，MPCManager不符合我看到的协议MCNearbyServiceAdvertizerDelegate –

。所以，你必须在'advertiser'方法中改变'invitationHandler'匹配类型的定义。 – t4nhpt

试过了，那么它会抛出一个错误invitationHandler必须在init func中初始化，我该如何初始化这样一个var？ –

酒店类MPCManager的invitationHandler被定义为：

var invitationHandler: (Bool, MCSession!) -> Void!

...而invitationHandleradvertiser方法的参数定义为

invitationHandler: (Bool, MCSession) -> Void

有2个错配的位置：

Property's return value is Void!而参数返回Void
属性的第二个参数是MCSession!而方法需要MCSession

首先，我不明白这一点有Void!作为返回值。 Void意味着什么都没有被返回，所以不需要隐式地解开它。

其次，参数的类型必须匹配。所以，无论是应该是MCSession或两个MCSession!。

E.g.以下不会产生你提到的错误：

var invitationHandler: (Bool, MCSession!) -> Void 

// ... 

func advertiser(advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: NSData?, 
    invitationHandler: (Bool, MCSession!) -> Void) {

来源

2015-11-04 06:52:28 courteouselk

Swift：无法赋值'（Bool，MCSession） - > Void'键入'（Bool，MCSession！） - > Void！'

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