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iOS MultipeerConnectivity

  • 问题

    承接上文[iOS实现WIFI传书],如果去掉局域网会如何?能否实现设备间文件传输

    iOS设备间的数据传输常用方式:

      1.蓝牙
      2.airdrop
      3.MultipeerConnectivity
    复制代码

    该篇单讲MultipeerConnectivity

  • 上菜

    设备作为服务端

    • 要有一个标志自己的PeerID
    lazy var me: MCPeerID = {
        let peer = MCPeerID(displayName: UIDevice.current.name)
        return peer
    }()
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    • 一个session
    lazy var session: MCSession = {
        let ss = MCSession(peer: me, securityIdentity: nil, encryptionPreference: .none)
        ss.delegate = self
        return ss
    }()
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    • 广播出去,其他设备才能搜索到
    lazy var advertiser: MCNearbyServiceAdvertiser = {
        let advertiser = MCNearbyServiceAdvertiser(peer: me, discoveryInfo: ["demo": "data"], serviceType: "shanzhai")
        advertiser.delegate = self
        return advertiser
    }()
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    • 开始广播
    advertiser.startAdvertisingPeer()
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    • 广播的代理方法执行
    extension MultipeerConnectVC: MCNearbyServiceAdvertiserDelegate {
        func advertiser(_ advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: Data?, invitationHandler: @escaping (Bool, MCSession?) -> Void) {
            // 确认连接,赋值session
            invitationHandler(true, session)
        }
        
        func advertiser(_ advertiser: MCNearbyServiceAdvertiser, didNotStartAdvertisingPeer error: Error) {
            advertiser.stopAdvertisingPeer()
            print("Woops! Advertising failed with error \(String(describing: error))")
        }
    }
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    设备作为客户端

    • 要有一个标志自己的PeerID
    lazy var me: MCPeerID = {
        let peer = MCPeerID(displayName: UIDevice.current.name)
        return peer
    }()
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    • 一个session
    lazy var session: MCSession = {
        let ss = MCSession(peer: me, securityIdentity: nil, encryptionPreference: .none)
        ss.delegate = self
        return ss
    }()
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    • 需要一个搜索PeerID
    lazy var browser: MCNearbyServiceBrowser = {
        let bs = MCNearbyServiceBrowser(peer: me, serviceType: "shanzhai")
        bs.delegate = self
        return bs
    }()
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    • 开始搜索
    browser.startBrowsingForPeers()
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    • 代理中检索到附近的PeerID, 检索到可以自己存下来,也可以直接链接,依业务需求来,此处直连
    extension MultipeerConnectVC: MCNearbyServiceBrowserDelegate {
        func browser(_ browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) {
            print("search peerId = \(peerID)")
            //搜到了peerID可以放入数组中,选择想要连接的peerID连接,这里直接连接
            browser.invitePeer(peerID, to: session, withContext: nil, timeout: 10)
        }
        
        func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
            print("lost peerID = \(peerID)")
        }
        
        func browser(_ browser: MCNearbyServiceBrowser, didNotStartBrowsingForPeers error: Error) {
            print("error = \(error)")
        }
    }
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    连接过程看Session,session代理中看各个过程

    extension MultipeerConnectVC: MCSessionDelegate {
    
        func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
        }
        
        func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
            
        }
        
        func session(_ session: MCSession, didReceive stream: InputStream, withName streamName: String, fromPeer peerID: MCPeerID) {
            
        }
        
        func session(_ session: MCSession, didStartReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, with progress: Progress) {
        }
        
        func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, withError error: Error?) { 
    
        }
    }
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    • 代理方法didChange didChange方法中 MCSessionState == .connected,表示连接上,连接上后可传递数据

    • 代理方法didFinishReceivingResourceWithName,可以查看接收到的数据

    • 也可使用MCBrowserViewController,搜索到的PeerID,无需自己写界面

  • 结语

    该方式并未打通iOS与Android,适用于苹果设备之间的无网络数据传输。FileChat在苹果设备之间的实现方式应该是基于此进行的

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iOS
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