ios - Trying to change backgroundColor every x seconds -

what trying change backgroundcolor of screen new color every 5 seconds keep getting 2 errors. 1 in extension of uicolor, says "declaration valid @ file scope" , in self.view.backgroundcolor says "type 'uicolor' has no member of 'randomcolor'". thank or , time , ope helps other people out there. below code:

import uikit  class viewcontroller: uiviewcontroller {      @iboutlet weak var person: uiview!      extension uicolor {         func randomcolor() -> uicolor{             let red = cgfloat(drand48())             let green = cgfloat(drand48())             let blue = cgfloat(drand48())             return uicolor(red: red, green: green, blue: blue, alpha: 1.0)         }     }     func changebackround() -> uicolor {         self.view.backgroundcolor = uicolor.randomcolor()     }      override func viewdidload() {         self.viewdidload()          nstimer.scheduledtimerwithtimeinterval(5, target: self, selector: selector("changebackground"), userinfo: nil, repeats: true)      }  } 

you cannot declare class extension within declaration scope of class. should move block

extension uicolor {     func randomcolor() -> uicolor {         let red = cgfloat(drand48())         let green = cgfloat(drand48())         let blue = cgfloat(drand48())         return uicolor(red: red, green: green, blue: blue, alpha: 1.0)     } } 

outside of scope of class viewcontroller: uiviewcontroller.

plus, here func randomcolor() -> uicolor declares method on instances of uicolor. want declare func static have class method. resulting file should be

import uikit  class viewcontroller: uiviewcontroller {      @iboutlet weak var person: uiview!      func changebackround() -> uicolor {         self.view.backgroundcolor = uicolor.randomcolor()     }      override func viewdidload() {         self.viewdidload()          nstimer.scheduledtimerwithtimeinterval(5, target: self, selector: selector("changebackground"), userinfo: nil, repeats: true)      }  }  extension uicolor {     static func randomcolor() -> uicolor {         let red = cgfloat(drand48())         let green = cgfloat(drand48())         let blue = cgfloat(drand48())         return uicolor(red: red, green: green, blue: blue, alpha: 1.0)     } }