multipeerconectivityを用いて接続を行った後、遷移先の画面で、データのやり取りがしたい

Question

###前提・実現したいこと
multipeerconectivityを用いて２端末間でデータを送受信したいのですが、２端末の接続が成功したところで画面を遷移して、もう一つの画面でデータのやり取りをしたいのですが、その方法がよくわからなくて困っています。

###発生している問題

データの受信を始めの画面で行ってしまう

###該当のソースコード

import UIKit
import MultipeerConnectivity
class ViewController: UIViewController,MCSessionDelegate,MCNearbyServiceBrowserDelegate,MCNearbyServiceAdvertiserDelegate {
    
    let peer : MCPeerID = MCPeerID(displayName: UIDevice.currentDevice().name)
    
    var browser : MCNearbyServiceBrowser?
    var advertis : MCNearbyServiceAdvertiser?
    let service = "p2p"
    var appdelegate = UIApplication.sharedApplication().delegate as! AppDelegate

    override func viewDidLoad() {
        appdelegate.session = MCSession(peer: peer)
        appdelegate.session!.delegate = self
        self.browser = MCNearbyServiceBrowser(peer: peer, serviceType: service)
        self.browser!.delegate = self
        self.advertis = MCNearbyServiceAdvertiser(peer: peer, discoveryInfo: nil, serviceType: service)
        self.advertis?.delegate = self
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    
    @IBAction func browser(sender: AnyObject) {
        
        self.browser!.startBrowsingForPeers()
    }

    @IBAction func advertiser(sender: AnyObject) {
        self.advertis!.startAdvertisingPeer()
    }
    func browser(browser: MCNearbyServiceBrowser, foundPeer peerID: MCPeerID, withDiscoveryInfo info: [String : String]?) {
        print("[MCNearbyServiceBrowserDelegate] browser:foundPeer:withDiscoveryInfo:")
        print("  + peerID = \(peerID.displayName)")
        print("  + info = \(info)")
        browser.invitePeer(peerID, toSession: appdelegate.session!, withContext: nil, timeout: 10)
    }
    
    func browser(browser: MCNearbyServiceBrowser, lostPeer peerID: MCPeerID) {
        print("[MCNearbyServiceBrowserDelegate] browser:lostPeer:")
        print("  + peerID = \(peerID.displayName)")
    }
    
    
    // MARK:- MCNearbyServiceAdvertiserDelegate
    
    func advertiser(advertiser: MCNearbyServiceAdvertiser, didReceiveInvitationFromPeer peerID: MCPeerID, withContext context: NSData?, invitationHandler: (Bool, MCSession) -> Void) {
        print("[MCNearbyServiceAdvertiserDelegate] advertiser:didReceiveInvitationFromPeer:withContext:invitationHandler:")
        print("  + peerID = \(peerID.displayName)")
        
        let alert = UIAlertController(title: "招待を受けました", message: "from \(peerID.displayName)", preferredStyle: .Alert)
        alert.addAction(UIAlertAction(title: "参加", style: .Default) { action in
            invitationHandler(true, self.appdelegate.session!)
            })
        alert.addAction(UIAlertAction(title: "拒否", style: .Cancel) { action in
            invitationHandler(false, self.appdelegate.session!)
            })
        self.presentViewController(alert, animated: true, completion: nil)
    }
    func session(session: MCSession, peer peerID: MCPeerID, didChangeState state: MCSessionState) {
        //画面遷移のコード
        let viewcontroller = self.storyboard!.instantiateViewControllerWithIdentifier("view2")
        self.presentViewController(viewcontroller,animated: true,completion: nil)
        print("change window")
        
    }
    func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) {
        print("receivedData")
    }
    
    func session(session: MCSession, didReceiveStream stream: NSInputStream, withName streamName: String, 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?) {
    }
    
}

import UIKit
import MultipeerConnectivity
class secondViewController: UIViewController {

    let appdelegate = UIApplication.sharedApplication().delegate as! AppDelegate
    
    override func viewDidLoad() {
        super.viewDidLoad()

        // Do any additional setup after loading the view.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }
    //view1に戻る
    @IBAction func Modori(sender: AnyObject) {
        let viewcontroller = self.storyboard!.instantiateViewControllerWithIdentifier("view1")
        self.presentViewController(viewcontroller,animated: true, completion: nil)
    }

    @IBAction func send(sender: AnyObject) {
        let str = "text"
        let data = (str as NSString).dataUsingEncoding(NSUTF8StringEncoding)
        do{
            try appdelegate.session?.sendData(data!, toPeers: (appdelegate.session?.connectedPeers)!, withMode: .Reliable)
        }catch let error as NSError{
            print("sned error")
        }
       
    
    }
    func session(session: MCSession, didReceiveData data: NSData, fromPeer peerID: MCPeerID) {
        print("received Data")
    }
    /*
    // MARK: - Navigation

    // In a storyboard-based application, you will often want to do a little preparation before navigation
    override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
        // Get the new view controller using segue.destinationViewController.
        // Pass the selected object to the new view controller.
    }
    */

}

import UIKit
import MultipeerConnectivity
@UIApplicationMain
class AppDelegate: UIResponder,UIApplicationDelegate {

    var window: UIWindow?
    var session : MCSession?
    


    func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
        // Override point for customization after application launch.
        return true
    }

    func applicationWillResignActive(application: UIApplication) {
        // Sent when the application is about to move from active to inactive state. This can occur for certain types of temporary interruptions (such as an incoming phone call or SMS message) or when the user quits the application and it begins the transition to the background state.
        // Use this method to pause ongoing tasks, disable timers, and throttle down OpenGL ES frame rates. Games should use this method to pause the game.
    }

    func applicationDidEnterBackground(application: UIApplication) {
        // Use this method to release shared resources, save user data, invalidate timers, and store enough application state information to restore your application to its current state in case it is terminated later.
        // If your application supports background execution, this method is called instead of applicationWillTerminate: when the user quits.
    }

    func applicationWillEnterForeground(application: UIApplication) {
        // Called as part of the transition from the background to the inactive state; here you can undo many of the changes made on entering the background.
    }

    func applicationDidBecomeActive(application: UIApplication) {
        // Restart any tasks that were paused (or not yet started) while the application was inactive. If the application was previously in the background, optionally refresh the user interface.
    }

    func applicationWillTerminate(application: UIApplication) {
        // Called when the application is about to terminate. Save data if appropriate. See also applicationDidEnterBackground:.
    }


}

###試したこと
secondViewController.swiftにDidReciveDataを書いて試してみましたが、初めの画面で、受信しています。

###補足情報(言語/FW/ツール等のバージョンなど)
プログラムは、上から、viewcontroller.swift secondViewController.swift appdelegate.swiftです。
宜しくお願いします。

Answer 1

切り替えたいタイミングで、MCSession()のdelegateにsecondViewControllerのインスタンスをセットしてやればいいと思います。

Comments

[afuroda]

切り替えたいタイミングとはfunc session(session: MCSession, peer peerID: MCPeerID, didChangeState state: MCSessionState) {
//画面遷移のコード
let viewcontroller = self.storyboard!.instantiateViewControllerWithIdentifier("view2")
self.presentViewController(viewcontroller,animated: true,completion: nil)
print("change window")
の画面を切り替えたい所のことですか？

[fuzzball]

そこか、secondViewControllerのviewDidLoadあたりでいいんじゃないかと。
ご自身で検証してみて下さい。

[afuroda]

secondViewControllerのviewDidLoadにappdelegate.session?.delegate = selfとかいたらうまく動くました。ありがとうございます。