swift - value of type 'string' has no member 'text' -

a part of app number fextfiled , double in 10. error message:

the alert massage 2 sentence @ code down here.

class viewcontroller: uiviewcontroller, uipickerviewdelegate, uipickerviewdatasource {      @iboutlet var label: uilabel!     @iboutlet var picker1: uipickerview!     @iboutlet var num: uitextfield!      var array1 = ["km","m","dm","mm"]     var placeanswer = 0     var answer = float()    override func viewdidload() {         super.viewdidload()        }      override func didreceivememorywarning() {         super.didreceivememorywarning()        }      func pickerview(pickerview: uipickerview, titleforrow row: int, forcomponent component: int) -> string? {         return array1[row]      }      func pickerview(pickerview: uipickerview, numberofrowsincomponent component: int) -> int{          return array1.count     }       func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{         return 1     }     @ibaction func submit(sender: anyobject) {          if(placeanswer==0){ answer = num.text             label.text = ("\(answer)")          } 

nsnumberformatter can translate string nsnumber:

let numberformatter = nsnumberformatter() numberformatter.numberstyle = .decimalstyle let number = numberformatter.numberfromstring(num.text)! answer = number.floatvalue