ios - How do I change the background color of the text in view of the UIPickerView with multiple components when a valid selection is made, in Swift -

below code change background color of uipickerview cyan showing valid selection when total of row indexes = 6. have pickerlabel background in view(selected) turn cyan instead in 4 components when selection valid. idea?

import uikit  class viewcontroller: uiviewcontroller, uipickerviewdatasource, uipickerviewdelegate {      @iboutlet weak var mypicker: uipickerview!     let pickerdata0 = ["0r","1r","2r","3r","4r","5r","6r"]     let pickerdata1 = ["0b","1b","2b","3b","4b","5b","6b"]     let pickerdata2 = ["0y","1y","2y","3y","4y","5y","6y"]     let pickerdata3 = ["0g","1g","2g","3g","4g","5g","6g"]      override func viewdidload() {         super.viewdidload()         // additional setup after loading view, typically nib.         mypicker.datasource = self         mypicker.delegate = self      }      override func didreceivememorywarning() {         super.didreceivememorywarning()         // dispose of resources can recreated.     }       //mark: delegates , data sources     //mark: data sources     func numberofcomponentsinpickerview(pickerview: uipickerview) -> int {         return 4     }      func pickerview(pickerview: uipickerview, numberofrowsincomponent component: int) -> int {         return pickerdata0.count     }     //mark: delegates      func pickerview(pickerview: uipickerview, didselectrow row: int, incomponent component: int) {         let redindex = mypicker.selectedrowincomponent(0)         let blueindex = mypicker.selectedrowincomponent(1)         let yellowindex = mypicker.selectedrowincomponent(2)         let greenindex = mypicker.selectedrowincomponent(3)          if redindex + blueindex + yellowindex + greenindex == 6 {             mypicker.backgroundcolor = uicolor.cyancolor()         } else {             mypicker.backgroundcolor = uicolor.whitecolor()         }        }       func pickerview(pickerview: uipickerview, viewforrow row: int, forcomponent component: int, reusingview view: uiview!) -> uiview {          switch component {         case 0:             var pickerlabel = view as! uilabel!             if view == nil {                 pickerlabel = uilabel()                 pickerlabel.textcolor = uicolor.redcolor()                 pickerlabel.backgroundcolor = uicolor.graycolor()                 pickerlabel.textalignment = nstextalignment.center                 pickerlabel.text = pickerdata0[row]                 pickerlabel.font = uifont(name: "georgia", size: 26)             }             return pickerlabel         case 1:             var pickerlabel = view as! uilabel!             if view == nil {                 pickerlabel = uilabel()                 pickerlabel.textcolor = uicolor.bluecolor()                 pickerlabel.backgroundcolor = uicolor.graycolor()                 pickerlabel.textalignment = nstextalignment.center                 pickerlabel.text = pickerdata1[row]                 pickerlabel.font = uifont(name: "georgia", size: 26)             }             return pickerlabel         case 2:             var pickerlabel = view as! uilabel!             if view == nil {                 pickerlabel = uilabel()                 pickerlabel.textcolor = uicolor.yellowcolor()                 pickerlabel.backgroundcolor = uicolor.graycolor()                 pickerlabel.textalignment = nstextalignment.center                 pickerlabel.text = pickerdata2[row]                 pickerlabel.font = uifont(name: "georgia", size: 26)             }             return pickerlabel         case 3:             var pickerlabel = view as! uilabel!             if view == nil {                 pickerlabel = uilabel()                 pickerlabel.textcolor = uicolor.greencolor()                 pickerlabel.backgroundcolor = uicolor.graycolor()                 pickerlabel.textalignment = nstextalignment.center                 pickerlabel.text = pickerdata3[row]                 pickerlabel.font = uifont(name: "georgia", size: 26)             }             return pickerlabel         default:           return pickerview         }     } } 

u want pickerlabel background in view(selected) turn cyan instead in 4 components. u can change code in pickviewdidselectrow :

if redindex + blueindex + yellowindex + greenindex == 6 {         mypicker.backgroundcolor = uicolor.cyancolor()     } else {         mypicker.backgroundcolor = uicolor.whitecolor()     }   

to :

if redindex + blueindex + yellowindex + greenindex == 6 {   mypicker.viewforrow(row, forcomponent: component)?.backgroundcolor = uicolor.cyancolor() } else {   mypicker.viewforrow(row, forcomponent: component)?.backgroundcolor = uicolor.whitecolor() } 

btw i'm not sure whether fit needs.