Swift：無法賦值'（Bool，MCSession） - > Void'鍵入'（Bool，MCSession！） - > Void！'

我試着this tutorial，因爲新的swift版本出現了一些錯誤，其中一個是MPCManager不符合協議MCNearbyServiceAdvertiserDelegate。Swift：無法賦值'（Bool，MCSession） - > Void'鍵入'（Bool，MCSession！） - > Void！'

我試圖來解決它，所以我改變FUNC廣告客戶的首標到這一個：

FUNC廣告（廣告客戶：MCNearbyServiceAdvertiser， didReceiveInvitationFromPeer的peerID：MCPeerID，withContext上下文： NSData的?, invitationHandler：（布爾，MCSession） - >無效）{

，但隨後引發我一個錯誤

無法賦值'（Bool，MCSession） - >無效'鍵入'（Bool， MCSession！） - > Void！'

我不知道如何解決，幫助讚賞！

實際文件：

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) { } 

    }

來源

2015-11-03 Dror Chen

你能否把有問題的代碼片段放到你的問題中？ – courteouselk

已編輯！現在呢？ –

你能解決這個問題嗎？ – Gamerlegend

您與(Bool, MCSession!)->Void!類型定義的變量invitationHandler，然後用值(Bool, MCSession)->Void)類型分配它。這是導致錯誤信息的原因。

要解決該問題，請使用參數匹配類型和invitationHandler變量定義advertiser方法。

來源

2015-11-04 01:58:02 t4nhpt

如果我這樣做，我再次顯示第一個錯誤，MPCManager不符合我看到的協議MCNearbyServiceAdvertizerDelegate –

。所以，你必須在'advertiser'方法中改變'invitationHandler'匹配類型的定義。 – t4nhpt

試過了，那麼它會拋出一個錯誤invitationHandler必須在init func中初始化，我該如何初始化這樣一個var？ –

酒店類MPCManager的invitationHandler被定義爲：

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

...而invitationHandleradvertiser方法的參數定義爲

invitationHandler: (Bool, MCSession) -> Void

有2個錯配的位置：

Property's return value is Void!而參數返回Void
屬性的第二個參數是MCSession!而方法需要MCSession

首先，我不明白這一點有Void!作爲返回值。 Void意味着什麼都沒有被返回，所以不需要隱式地解開它。

其次，參數的類型必須匹配。所以，無論是應該是MCSession或兩個MCSession!。

E.g.以下不會產生你提到的錯誤：

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

// ... 

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

來源

2015-11-04 06:52:28 courteouselk

Swift：無法賦值'（Bool，MCSession） - > Void'鍵入'（Bool，MCSession！） - > Void！'

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