MCSessionDelegate需要类符合NSObjectProtocol

Question

我试图从Apple使用MultipeerConnectivity库，但我的类不会停止抛出错误“类型LocalClient不符合NSObjectProtocol”。我是否错过了会导致此错误的任何内容？

import Foundation 
import MultipeerConnectivity 

class LocalClient : MCSessionDelegate { 
    var availableServers : [Int] 
    var session : MCSession 
    var peerID : MCPeerID 
    var browser : MCBrowserViewController 

    init(name : String) { 
     peerID = MCPeerID(displayName: name) 

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

     browser = MCBrowserViewController(serviceType: "JoinGame", session: session) 
    } 

    func session(session: MCSession!, peer peerID: MCPeerID!, didChangeState state: MCSessionState) { 

    } 

    func session(session: MCSession!, didReceiveData data: NSData!, fromPeer peerID: MCPeerID!) { 

    } 

    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!) { 

    } 

} 

编辑：格式。

Answer 1

MCSessionDelegate协议源自NSObjectProtocol。 因此，你的类应该是NSObject子类，所以它继承了所有NSObjectProtocol方法：

class LocalClient : NSObject, MCSessionDelegate { } 

这也需要调用super.init()（值后就一直 分配给所有属性）：

init(name : String) { 
    peerID = MCPeerID(displayName: name) 
    session = MCSession(peer: peerID) 
    availableServers = [] 
    browser = MCBrowserViewController(serviceType: "JoinGame", session: session) 

    super.init() 

    session.delegate = self 
}