我在不同设备上遇到与Multipeer Connectivity非常不稳定的连接。
测试：
iPhone 6，MacBook和iPad都可以通过wifi连接。但iPad和iPhone 6无法连接蓝牙。然而，iPhone SE可以通过蓝牙连接到iPad。但是iPhone 5无法连接到wifi上的任何设备（尽管它们已被列出，但我无法连接到它们）。
这非常不可靠，我想知道我的代码中是否有任何错误。
代码（Xcode 9.2，Swift）：
import UIKit
import MultipeerConnectivity
class ViewController: UIViewController, MCSessionDelegate, MCBrowserViewControllerDelegate {
@IBOutlet weak var label: UILabel!
@IBOutlet weak var textField: UITextField!
@IBAction func send_button(_ sender: Any) {
sendText(inputText: textField.text!)
}
var peerID: MCPeerID!
var mcSession: MCSession!
var mcAdvertiserAssistant: MCAdvertiserAssistant!
override func viewDidLoad() {
super.viewDidLoad()
peerID = MCPeerID(displayName: UIDevice.current.name)
mcSession = MCSession(peer: peerID, securityIdentity: nil, encryptionPreference: .required)
mcSession.delegate = self
}
@IBAction func host_button_action(_ sender: Any) {
startHosting()
}
@IBAction func join_button_action(_ sender: Any) {
joinSession()
}
// Host session
func startHosting() {
mcAdvertiserAssistant = MCAdvertiserAssistant(serviceType: "hws-kb", discoveryInfo: nil, session: mcSession)
mcAdvertiserAssistant.start()
}
// Join session
func joinSession() {
let mcBrowser = MCBrowserViewController(serviceType: "hws-kb", session: mcSession)
mcBrowser.delegate = self
present(mcBrowser, animated: true)
}
// Send
func sendText(inputText: String) {
if mcSession.connectedPeers.count > 0 {
let myDictionary = ["User" : "player name", "Message" : "\(inputText)"]
do {
let data = NSKeyedArchiver.archivedData(withRootObject: myDictionary)
try mcSession.send(data, 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)
}
}
}
// Receive data
func session(_ session: MCSession, didReceive data: Data, fromPeer peerID: MCPeerID) {
DispatchQueue.main.async { [unowned self] in
print("Getting data: \(data)")
let myDictionary = NSKeyedUnarchiver.unarchiveObject(with: data) as! NSDictionary
let message = myDictionary.value(forKey: "Message") as? String
self.label.text = message
}
}
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 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)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}