swift - How to change text of navigation bar (UISearchController)? -


i have created navigation bar uisearchcontroller.

below code: 

@ibaction func showsearchcontroller(sender: anyobject) {     let searchcontroller = uisearchcontroller(searchresultscontroller: searchresultcontroller)     searchcontroller.searchbar.delegate = self     /*     searchcontroller.searchbar.placeholder = "hhhhhhhhhhh"     searchcontroller.navigationitem.title = "hhhhhhhhhhh"     searchcontroller.navigationcontroller?.navigationbar.topitem?.title = "hhhhhhhh"    -->i try these codes change*/      self.presentviewcontroller(searchcontroller, animated: true, completion: nil) }

but can't change text.

enter image description here

var searchtextfield = searchcontroller.searchbar.valueforkey("_searchfield") as! uitextfield searchtextfield.placeholder = "your custom text"

enter image description hereuse change place holder text


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