BarButtonItem Doesn't Show button after added - iphone

Question

I want custom navigation item as facebook app.
Have two buttons and one UISearchBar. Buttons is leftBarButtonItem and rightBarButtonItem. UISearchBar is titleView.
to make searchbar in titleview become wide i removed two buttons by set it to nil as image below. and i add two buttons again when searchBarCancelButton clicked but the buttons doesn't shown.
Could u help me ?
when click searchBarCancelButton i want it to show as below
Code I have try:
func updateSearchResultsForSearchController(searchController: UISearchController) {
if navigationItem.rightBarButtonItem != nil {
self.navigationItem.rightBarButtonItem = nil
self.navigationItem.leftBarButtonItem = nil
}
}
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
navigationItem.setLeftBarButtonItem(getBarButtonItem("info", buttonfor: "left"), animated: false)
navigationItem.setRightBarButtonItem(getBarButtonItem("more_‌​icon", buttonfor: "right"), animated: false)
}
extension MainviewCtrl : UISearchResultsUpdating {
func updateSearchResultsForSearchController(searchController: UISearchController) {
if navigationItem.rightBarButtonItem != nil {
self.navigationItem.rightBarButtonItem = nil
self.navigationItem.leftBarButtonItem = nil
}
}
}
extension MainviewCtrl : UISearchBarDelegate {
func searchBarCancelButtonClicked(searchBar: UISearchBar) {
navigationItem.setLeftBarButtonItem(getBarButtonItem("info", buttonfor: "left"), animated: false)
navigationItem.setRightBarButtonItem(getBarButtonItem("more_icon", buttonfor: "right"), animated: false)
}
}
class MainviewCtrl: UIViewController , UISearchControllerDelegate {
lazy var searchController : UISearchController = {
let _searchController = UISearchController(searchResultsController: nil)
_searchController.searchResultsUpdater = self
_searchController.dimsBackgroundDuringPresentation = false
_searchController.hidesNavigationBarDuringPresentation = false
_searchController.searchBar.delegate = self
_searchController.searchBar.tintColor = UIColor.whiteColor()
_searchController.searchBar.searchBarStyle = UISearchBarStyle.Minimal
var textFieldInsideSearchBar = _searchController.searchBar.valueForKey("searchField") as? UITextField
textFieldInsideSearchBar?.textColor = UIColor.whiteColor()
return _searchController
}()
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.titleView = searchController.searchBar
definesPresentationContext = true
addBarButtonItems()
}
func addBarButtonItems(){
navigationItem.leftBarButtonItem = getBarButtonItem("info", buttonfor: "left")
navigationItem.rightBarButtonItem = getBarButtonItem("more_icon", buttonfor: "right")
}
func getBarButtonItem(imagename : String , buttonfor : String)-> UIBarButtonItem!{
let image = (UIImage(named: imagename))!.imageWithRenderingMode(UIImageRenderingMode.AlwaysOriginal)
switch buttonfor.lowercaseString {
case "left":
return (UIBarButtonItem(image: image, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(MainviewCtrl.infoAction)))
case "right":
return (UIBarButtonItem(image: image, style: UIBarButtonItemStyle.Plain, target: self, action: #selector(MainviewCtrl.moreAction)))
default : break ;
}
return UIBarButtonItem()
}

Answer 1

updateSearchResultsForSearchController will get called again after you click cancel button and make those items nil. you can check if the search controller is active before setting them to nil in updateSearchResultsForSearchController:
func updateSearchResultsForSearchController(searchController: UISearchController) {
if navigationItem.rightBarButtonItem != nil && searchController.active {
self.navigationItem.rightBarButtonItem = nil
self.navigationItem.leftBarButtonItem = nil
}
}