swift2 - mac osx app - swift window & viewcontroller fullscreen/resize -

i trying work out how windowcontroller , viewcontroller can talk each other when user clicks on windowcontroller fullscreen or manually resizes screen.

i have uploaded full code github, noob @ swift , not sure parts of script need.

but here part of code

// //  viewcontroller.swift //  slither.io // //  created russell harrower on 1/06/2016. //  copyright © 2016 russell harrower. rights reserved. // import cocoa import webkit class viewcontroller: nsviewcontroller {     @iboutlet weak var webview:wkwebview!      override func viewwillappear() {         super.viewwillappear()         preferredcontentsize = view.fittingsize     }      override func viewdidload()     {         super.viewdidload()         //let webviewconfiguration: wkwebviewconfiguration = wkwebviewconfiguration()         let webview: wkwebview = wkwebview(frame:self.view.frame)         let urlstring = nsurl(string:"http://slither.io")         let requestobj = nsurlrequest(url: urlstring!)          webview.loadrequest(requestobj)         self.view.addsubview(webview)          //self.webview.mainframe.loadrequest(nsurlrequest(url: nsurl(string: urlstring)!))     }      override var representedobject: anyobject? {         didset {         // update view, if loaded.         }     } } 

you can see full xcodeproject @ https://github.com/russellharrower/slither.io-mac-app

set constrains of webview super view. (i have set web view constrains in storyboard sure can in run time too)