ios - What is Best Practice For UISearchBar With Buttons -

i make following ui app: have search bar user can search stickers , has option add new one. i've tried several approaches ui none of them work well. first tried embedding uisearchbar , uibutton in uinavigationbar using them bar button items didn't let me work auto layout. tried similar thing uitoolbar. figured uistackview easier lay out. , was. in image above have uisearchbar , uibutton in uistackview. problem have hairline below search bar not below button. advice on how this?

update: added code remove hairline it's leaving 1 px of black beneath it. here's code:

override func viewdidload() {     super.viewdidload()     let color = uicolor.clear()     searchbar.layer.borderwidth = 0     searchbar.layer.bordercolor = color.cgcolor      // additional setup after loading view. } 

and here's picture of problem:

if don't want spend time fighting uisearchbar, may own searchbar, based on simple uiview.

this way sure keep control when ios upgraded on years..

i personnaly think not right solution subclass or customize os classes.