【发布时间】：2018-01-31 03:52:27
【问题描述】：
我正在开发一个需要 Multipeer Connectivity 的应用程序，但遇到了一个特殊问题。
如果我设置了 MCSessionDelegate，我的设备将无法连接。如果我没有设置 MCSession 委托，我的设备会连接，但我无法收到响应。
如果没有委托，我可以告诉他们正在连接，因为打印出 MCSession.connectedPeers 数组会显示其他对等方。
处理连接和通信的类的简化版本如下所示。
import UIKit
import MultipeerConnectivity
class ConnectionManager: NSObject, MCSessionDelegate, MCNearbyServiceBrowserDelegate, MCNearbyServiceAdvertiserDelegate {
// MARK: - Properties
var advertiser: MCNearbyServiceAdvertiser!
var browser: MCNearbyServiceBrowser!
var peerID: MCPeerID!
var session: MCSession!
// MARK: - Lifecycle
override init() {
super.init()
peerID = MCPeerID(displayName: UIDevice.current.name)
advertiser = MCNearbyServiceAdvertiser(peer: peerID, discoveryInfo: nil, serviceType: "testconnect")
advertiser.delegate = self
browser = MCNearbyServiceBrowser(peer: peerID, serviceType: "testconnect")
browser.delegate = self
session = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .optional)
session.delegate = self
}
deinit {
advertiser.stopAdvertisingPeer()
browser.stopBrowsingForPeers()
print("Stopping connection service...")
}
// MARK: Session Delegate
func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
}
func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) {
switch state {
case .connected:
print("\(peerID.displayName) connected")
case .notConnected:
print("\(peerID.displayName) not connected")
case .connecting:
print("\(peerID.displayName) connecting")
}
}
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, didReceiveCertificate certificate: [Any]?, fromPeer peerID: MCPeerID, certificateHandler: @escaping (Bool) -> Void) {
}
func session(_ session: MCSession, didFinishReceivingResourceWithName resourceName: String, fromPeer peerID: MCPeerID, at localURL: URL?, withError error: Error?) {
}
// MARK: - Nearby Advertiser Delegate
func advertiser(_ advertiser: MCNearbyServiceAdvertiser, didNotStartAdvertisingPeer error: Error) {
print("\(#function): \(error.localizedDescription)")
}
func advertiser(_ advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: Data?, invitationHandler: @escaping (Bool, MCSession?) -> Void) {
print("Invitation received from \(peerID.displayName)")
invitationHandler(true, session)
}
// MARK: - Nearby Browser Delegate
func browser(_ browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
print("Lost peer \(peerID.displayName)")
}
func browser(_ browser: MCNearbyServiceBrowser, didNotStartBrowsingForPeers error: Error) {
print(error.localizedDescription)
}
func browser(_ browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String: String]?) {
print("Found peer \(peerID.displayName)")
browser.invitePeer(peerID, to: session, withContext: nil, timeout: 30)
}
}
如果我注释掉设备连接的session.delegate = self 行，如打印 session.connectedPeers 所示。保持原样，设备会尝试连接，但失败。
我还创建了一个非常简单的应用程序来演示这里的问题，https://github.com/StagasaurusRex/MultiPeerConnectionTest
只需让两台设备做广告，然后让其中一台进行浏览，这些设备就会尝试连接，您可以看到使用代理时它们会失败，但没有代理它们会成功。通过打印连接来验证这一点。
有人知道发生了什么吗？非常感谢您的帮助，我一直在努力解决这个问题。
谢谢。
【问题讨论】：
标签： ios swift multipeer-connectivity