导航控制器中的中心搜索栏

Question

I need to change the orientation of a search bar in a navigation controller to be set to the center. I have created the search bar programmatically with this code:

lazy   var searchBar:UISearchBar = UISearchBar(frame: CGRectMake(100, 40, 440, 40))

and in viewDidLoad:

searchBar.placeholder = "Search for Places"
        var leftNavBarButton = UIBarButtonItem(customView:searchBar)
        self.navigationItem.leftBarButtonItem = leftNavBarButton

However I also have a barButtonItem in the left. This has been set through the interface.

The issue is that when I add the search bar through the code, the screen does not display the button as it gets covered as shown in the screenshot below.

How can I shift the search bar to show the menu button followed by the search bar in the center?

Answer 1

the reason are you assigned the searchBar to leftBarButtonItem that the reason it shows in left side , if you need in center of Navigation add your search to titleView for navigation bar, change this

     searchBar.placeholder = "Search for Places"
    var leftNavBarButton = UIBarButtonItem(customView:searchBar)
    self.navigationItem.leftBarButtonItem = leftNavBarButton

to

 lazy   var searchBar:UISearchBar = UISearchBar(frame: CGRectMake(0, 0, 440, 40))
searchBar.placeholder = "Search for Places"
self.navigationItem.titleView = searchBar // or use self.navigationcontroller.topItem?.titleView = searchBar

Answer 2

Your search bar is on the left because you're setting left navigation button. Try to change titleView instead.

let search = UISearchBar() // Create your search bar
controller.navigationController.navigationItem.titleView = search