ios - How to let the user upload images - how can I test this feature properly? -

my code works , lets me pick image kind of default saved camera roll apple has built in on computer. if understand right - whenever person use app of course have connect personal phone.

my question is: i'm trying test app using photos computer instead of default photos apple provides (landscapes , pictures of waterfalls). there way can directly access folder on desktop when click browse files button (btnclicked) , pull picture out of there?

here i'm using right now. how can manipulate need?

// custom image     var imagepicker = uiimagepickercontroller();      @iboutlet weak var imageview: uiimageview!      // button clicked image     @ibaction func btnclicked(sender: anyobject)     {         if uiimagepickercontroller.issourcetypeavailable(uiimagepickercontrollersourcetype.savedphotosalbum){             print("button capture")               imagepicker.delegate = self             imagepicker.sourcetype = uiimagepickercontrollersourcetype.savedphotosalbum;             imagepicker.allowsediting = false              self.presentviewcontroller(imagepicker, animated: true, completion: nil)         }     }      // view did load     override func viewdidload()     {         super.viewdidload();         // additional setup after loading view.          // set user's "hairstyle"         userhairstylelab.text = hairstyle;     }      // did receive memory warning     override func didreceivememorywarning()     {         super.didreceivememorywarning();         // dispose of resources can recreated.     }      func imagepickercontroller(picker: uiimagepickercontroller!, didfinishpickingimage image: uiimage!, editinginfo: [nsobject: anyobject]!){         self.dismissviewcontrolleranimated(true, completion: { () -> void in          })          imageview.image = image      }