ios - Load imageView from Xcassets using Switch statement -

i have images @1 @2 , @3 in xcassets , trying load image onto scrollview page using code below switches image due age on. page determined position , switch statement called in viewwillload function. images not loading sounds working know image loading problem. can help?

override func viewdiddisappear(animated: bool) {     self.imageview.removefromsuperview()     self.imageview.image = nil }    override func viewwillappear(animated: bool) {      showimageview()      let tapgestureimage = uitapgesturerecognizer(target: self, action: selector("handletapgestureimage:"))     imageview.addgesturerecognizer(tapgestureimage)     imageview.userinteractionenabled = true }     // mark: bwwalkthroughpage implementation  func walkthroughdidscroll(position: cgfloat, offset: cgfloat) {      // getting page number scroll position. first page loads nil want zero.      screenpage  = int(((position / view.bounds.size.width) + 1) - 1) }    func showimageview() {      // change imageview in bundle depending on scrollview page are.     switch screenpage {      case 0:          self.imageview.image = uiimage(named: "aligator", inbundle: nsbundle.mainbundle(), compatiblewithtraitcollection: self.traitcollection)         self.view.addsubview(imageview)      case 1:          self.imageview.image = uiimage(named: "bear", inbundle: nsbundle.mainbundle(), compatiblewithtraitcollection: self.traitcollection)         self.view.addsubview(imageview)      default:         self.imageview.image = nil     } } 

a few things important understand. not need add/remove image view view hierarchy on , over. calling imageview.image = nil suffice.

the second thing don't need use full method uiimage(named:inbundle:compatiblewithtraitcollection:). should able use uiimage(named:). if find having use former, may taking bigger bites can handle @ stage in career.

the third thing when override method, must call super in 99% of cases.

here's example should work:

import uikit  class myviewcontroller: uiviewcontroller {      override fun viewdidload() {         super.viewdidload()         let gesturerecognizer = uitapgesturerecognizer(target: self, action: selector("handletapgestureimage:"))         imageview.addgesturerecognizer(gesturerecognizer)         imageview.userinteractionenabled = true     }      override func viewdiddisappear(animated: bool) {         super.viewdiddisappear(animated: animated)         self.imageview.image = nil     }      override func viewwillappear(animated: bool) {         super.viewwillappear(animated: animated)         showimageview()     }      func walkthroughdidscroll(position: cgfloat, offset: cgfloat) {         screenpage  = int(((position / view.bounds.size.width) + 1) - 1)     }      func showimageview() {         switch screenpage {         case 0:             imageview.image = uiimage(named: "aligator")         case 1:             imageview.image = uiimage(named: "bear")         default:             imageview.image = nil         }     } }