I am trying to write this code in Swift 3, it is for multiplayer -


this code in old version of swift 2. trying write in swift 3 having problem. multiplayer game. having problem "let userinfo ". error "extra argument 'userinfo' "in call

import uikit import multipeerconnectivity  class mpchander: nsobject, mcsessiondelegate {     var peerid:mcpeerid!     var session:mcsession!     var browser:mcbrowserviewcontroller!     var advertiser:mcadvertiserassistant? = nil      func setuppeerwithdisplayname (displayname:string){         peerid = mcpeerid(displayname: displayname)     }      func setupsession(){         session = mcsession(peer: peerid)         session.delegate = self     }      func setupbrowser(){         browser = mcbrowserviewcontroller(servicetype: "my-game", session: session)     }      func advertiseself(advertise:bool){         if advertise{             advertiser = mcadvertiserassistant(servicetype: "my-game", discoveryinfo: nil, session: session)             advertiser!.start()         }else{             advertiser!.stop()             advertiser = nil         }     }      func session(_ session: mcsession, peer peerid: mcpeerid, didchange state: mcsessionstate) {         let userinfo = ["peerid":peerid,"state":state.rawvalue]         dispatch_async(dispatch_get_main_queue(), { () -> void in             nsnotificationcenter.defaultcenter().postnotificationname("mpc_didchangestatenotification", object: nil, userinfo: userinfo)         })      }      func session(_ session: mcsession, didreceive data: data, frompeer peerid: mcpeerid) {         let userinfo = [data:"data" , peerid:"peerid"] [anyhashable : string]         notificationcenter.default.post(name: nsnotification.name(rawvalue: "mpc_didchangestatenotification"), object: nil, userinfo: userinfo)     }      func session(_ session: mcsession, didfinishreceivingresourcewithname resourcename: string, frompeer peerid: mcpeerid, @ localurl: url?, witherror error: error?) {      }      func session(_ session: mcsession, didstartreceivingresourcewithname resourcename: string, frompeer peerid: mcpeerid, progress: progress) {      }      func session(_ session: mcsession, didreceive stream: inputstream, withname streamname: string, frompeer peerid: mcpeerid) {     } }

you should've posted entire console output.

the problem nsnotificationcenter. swap func session(_:, peer:, didchange:) method with:

func session(_ session: mcsession, peer peerid: mcpeerid, didchange state: mcsessionstate) {     let userinfo = ["peerid":peerid,"state":state.rawvalue] as! [anyhashable : string]     dispatchqueue.main.async {         notificationcenter.default.post(name: nsnotification.name(rawvalue: "mpc_didchangestatenotification"), object: nil, userinfo: userinfo)     } }

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