ios - The app always shows me the answer of the first -


i made calculator converts units of measurement. app shows me answer of first (km), unless whole answer. hope 1 of find mistake.

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){                 let numberformatter = nsnumberformatter()                 numberformatter.numberstyle = .decimalstyle                 let number = numberformatter.numberfromstring(num.text!)                 answer = number!.floatvalue                   answer = answer * 0.0001                 label.text = ("\(answer)"+"km")                 answer = 0         }         else if(placeanswer==1)         {             let numberformatter = nsnumberformatter()             numberformatter.numberstyle = .decimalstyle             let number = numberformatter.numberfromstring(num.text!)             answer = number!.floatvalue             answer = answer * 100             label.text = ("\(answer)" + "m")             answer = 0         }         else if(placeanswer==2)         {             let numberformatter = nsnumberformatter()             numberformatter.numberstyle = .decimalstyle             let number = numberformatter.numberfromstring(num.text!)              answer = number!.floatvalue             answer = answer * 10             label.text = ("\(answer)" + "dm")             answer = 0         }         else         {             let numberformatter = nsnumberformatter()             numberformatter.numberstyle = .decimalstyle             let number = numberformatter.numberfromstring(num.text!)             answer = number!.floatvalue             answer = answer / 10             label.text = ("\(answer)"+"mm")             answer = 0         }     }             }

because value of placeansweris not changing anywhere in code.

use set value

    func pickerview(pickerview: uipickerview, didselectrow row: int, incomponent component: int){          placeanswer = row }

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