Swift appdelegate error - appdelegate does not not confirm to protocol -

there codes writting.

import uikit  @uiapplicationmain class appdelegate: uiresponder, uiapplicationdelegate, xpageviewcontrollerdatasource {  var window: uiwindow?   func application(application: uiapplication, didfinishlaunchingwithoptions launchoptions: [nsobject: anyobject]?) -> bool {     // override point customization after application launch.     self.window = uiwindow(frame: uiscreen.mainscreen().bounds)       let pageveiwcontroller = xpageviewcontroller()     pageveiwcontroller.datasource = self      self.window?.rootviewcontroller = uinavigationcontroller(rootviewcontroller: pageveiwcontroller)     self.window?.makekeyandvisible()      return true } func xpagenumberofcontrollers() -> nsinteger {     return 5 } func xpagecontrollerstitle(index: nsinteger) -> string {     return "viewcontroller"+"title"+string(index) } func xpagewillshowcontroller(index: nsinteger) -> uiviewcontroller {     let vc = viewcontroller()     return vc }   } 

i writing pure coding programme without mainstoryboard in xcode, appdelegate.swift, try implement protocol xpageviewcontroller.swift, there 3 functions in protocol have written in appdelegate. , have declared in xpageviewcontroller.swift

var datasource:xpageviewcontrollerdatasource!     {     didset{         self.numberofcontrollers = self.datasource.xpagenumberofcontroller()         self.addviewtoself()     } 

which using in appdelegate

    pageveiwcontroller.datasource = self 

but still error occur there, shows"type 'appdelegate' not conform protocol 'xpageviewcontrollerdatasource'"

i run out solutions :d have ideas can me solve this?

can show xpageviewcontrollerdatasource protocol comprises of?

command+click in xcode view actual protocol.

either way, when view protocol should show requirements protocol are.