Question

我在Swift 4中使用Multipeer Connectivity，我想知道如何在程序运行时查看找到的设备，我得到了一些帮助，但我仍然不太了解所有这些。我也不知道在哪里放这个：

onMessageReceived

以下是我的完整代码，如果需要请更正任何代码，我也将扩展名放在下面代码的底部：

extension viewcontroller : MCBrowserViewControllerDelegate {
func browserViewControllerDidFinish(_ browserViewController:                         
MCBrowserViewController) {
serviceBrowser.dismiss(animated: true, completion: nil)
}
func browserViewControllerWasCancelled(_ browserViewController:   
MCBrowserViewController) {
serviceBrowser.dismiss(animated: true, completion: nil)
}

}

我刚刚编辑了扩展程序，但它说import UIKit import PlaygroundSupport import MultipeerConnectivity PlaygroundPage.current.needsIndefiniteExecution = true var peerID: MCPeerID! var mcSession: MCSession! var mcAdvertiserAssistant: MCAdvertiserAssistant! var foundPeers = [MCPeerID]() class viewcontroller: UIViewController { override func viewDidLoad() { var serviceBrowser : MCBrowserViewController! func startBrowsingForPeer() { serviceBrowser = MCBrowserViewController(serviceType: "lightning417techa", session: mcSession) serviceBrowser.delegate.self } peerID = MCPeerID(displayName: UIDevice.current.name) mcSession = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .none) mcSession.delegate.self class ViewController: UIViewController, MCSessionDelegate, MCBrowserViewControllerDelegate { let session = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .none) func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState) { switch state { case MCSessionState.connected: print("Connected: \(peerID.displayName)") case MCSessionState.connecting: print("Connecting: \(peerID.displayName)") case MCSessionState.notConnected: print("Not Connected: \(peerID.displayName)") } } func browser(browser: MCNearbyServiceBrowser!, foundPeer peerID: MCPeerID!, withDiscoveryInfo info: [NSObject : AnyObject]!) { foundPeers.append(peerID) print(browser) } func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) { if let image = UIImage(data: data) { DispatchQueue.main.async { [unowned self] in print("image recieved") } } } func sendImage(img: UIImage) { if mcSession.connectedPeers.count > 0 { if let imageData = UIImagePNGRepresentation(img) { do { try mcSession.send(imageData, toPeers: mcSession.connectedPeers, with: .reliable) } catch let error as NSError { let ac = UIAlertController(title: "Send error", message: error.localizedDescription, preferredStyle: .alert) ac.addAction(UIAlertAction(title: "OK", style: .default)) present(ac, animated: true) } } } } 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?) { } func browserViewControllerDidFinish(_ browserViewController: MCBrowserViewController) { dismiss(animated: true) } func browserViewControllerWasCancelled(_ browserViewController: MCBrowserViewController) { dismiss(animated: true) } func startHosting(action: UIAlertAction!) { mcAdvertiserAssistant = MCAdvertiserAssistant(serviceType: "hws-ridleyn", discoveryInfo: nil, session: mcSession) mcAdvertiserAssistant.start() } func joinSession(action: UIAlertAction!) { let mcBrowser = MCBrowserViewController(serviceType: "hws-ridleyn", session: mcSession) mcBrowser.delegate = self present(mcBrowser, animated: true) } let vc = UIToolbar(frame: CGRect(x: 100, y: 100, width: 200, height: 200)) // your view controller here } let vcc = ViewController() vcc.startHosting(action: nil) ViewController.startHosting(vcc) } } PlaygroundPage.current extension viewcontroller : MCBrowserViewControllerDelegate { func browserViewControllerDidFinish(_ browserViewController: MCBrowserViewController) { serviceBrowser.dismiss(animated: true, completion: nil) } func browserViewControllerWasCancelled(_ browserViewController: MCBrowserViewController) { serviceBrowser.dismiss(animated: true, completion: nil) } }某种程度上是不正确的，它想用serviceBrowser替换它。所以当我这样做的时候，NetServiceBrowser没有成员NetServiceBrowser。

Answer 1

MCSession包含一个名为connectedPeers的变量。

var connectedPeers：[MCPeerID] 当前连接到此会话的所有对等方的数组。

请参阅Apple documentation - MCSession class

Answer 2

如果您需要找到的对等项列表，请将存储的属性修改为

var foundPeers = [MCPeerID]() {
    didSet {
        let peers = foundPeers.map( {$0.displayName} )
        yourFoundPeerLabel.text = String(format: "Found Peers: %@", peers.joined(separator: ", "))
    }
}

每次找到设备时，storedProperty都会更新，并且在将新对等体追加到列表后，您的标签将自动更新。请参考您对委托方法的实现

func browser(browser: MCNearbyServiceBrowser!, foundPeer peerID: MCPeerID!, withDiscoveryInfo info: [NSObject : AnyObject]!);

PS：如果需要连接的设备列表，请创建一个类似的存储属性并使用委托方法

func session(_ session: MCSession, peer peerID: MCPeerID, didChange state: MCSessionState);

将设备添加到列表中。逻辑保持不变。

多路连接 - 如何查看找到的设备

2 个答案: