ios - Stick UIView to top of screen -

i try stick uiview top of screen.

i use following code:

import uikit  class viewcontroller: uiviewcontroller, uiscrollviewdelegate {  var navigationbaroriginaloffset : cgfloat?  @iboutlet weak var navigationbar: uiview! @iboutlet weak var scrollview: uiscrollview!  override func viewdidload() {     super.viewdidload()     scrollview.delegate = self     // additional setup after loading view, typically nib. }  override func didreceivememorywarning() {     super.didreceivememorywarning()     // dispose of resources can recreated. }  override func viewwillappear(animated: bool) {     super.viewwillappear(animated)     navigationbaroriginaloffset = navigationbar.frame.origin.y }  func scrollviewdidscroll(scrollview: uiscrollview) {     navigationbar.frame.origin.y = max(navigationbaroriginaloffset!, scrollview.contentoffset.y)     print("did scroll") } } 

but view doesn't stick, scrolls scrollview.

how can make stick?

you can add constraints of view want stick main view or top layout guide. trick