在viewDidLoad之后在NavigationBar中添加searchBar？

Question

In my application, I want to have a search button in the navigation bar and when the button is pressed searchbar should appear in the Navigation Bar. I've seen many posts on the subject, but somehow it does not work for me. So, I placed a SearchDisplayController right below nav bar. then in the viewDidLoad I assign an action to the search button and remove searchbar from superview. Once button is clicked, I am calling mapSearchDisplayController.displaysSearchBarInNavigationBar = true , but nothing happends. Code extracts below:

    override func viewDidLoad() {
            super.viewDidLoad()

            banner.delegate = self

            // Add button to navbar
            var filterButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Organize, target: self, action: nil)
            self.navigationItem.leftBarButtonItem = filterButton

            var aboutButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Add, target: self, action: "aboutAction")
            var searchButton : UIBarButtonItem = UIBarButtonItem(barButtonSystemItem: UIBarButtonSystemItem.Search, target: self, action: "searchAction")
            var rButtons : [UIBarButtonItem] = [aboutButton, searchButton]
            self.navigationItem.rightBarButtonItems = rButtons


            // Deal with Search Display Controller
            self.mapSearchDisplayController.delegate = self.mapSearchDisplayController;
            self.mapSearchDisplayController.searchResultsDataSource = self.mapSearchDisplayController;
            self.mapSearchDisplayController.searchResultsDelegate = self.mapSearchDisplayController;
            self.mapSearchDisplayController.searchBar.removeFromSuperview();
}
    func searchAction(){
            println("Search action")
            mapSearchDisplayController.displaysSearchBarInNavigationBar = true
        }

If I call displaysSearchBarInNavigationBar = true in viewDidLoad then searchBar correctly appears in the Navigation Bar. How do I make appear in Nav bar on the button press? Any help is appreaciated.

Answer 1

I created a search bar using

let searchBar = UISearchBar(frame : CGRect(0, 0, self.navigationController?.navigationBar.frame.size.width)! * 0.9, 0)

self.searchBar.placeholder = "Search"
self.searchBar.delegate = self

And then added it to the navigation bar as follows:

self.navigationItem.titleView = self.searchBar

Further styling etc can also be done but I just created and added it to the navbar on button pressed and removed it from superview when it needed to be hidden.