iOS 13 Changes to UISearchBar tint's, can't achieve the same outcome - xamarin.ios

Question

I've been experimenting all day and trying to figure out just how to get my UISearchBar to appear the same in iOS13 as it appears in iOS12/11
So the way the search bar is added is simply a new UISearchController.
var searchController = new UISearchController(searchResultsController: null);
searchController.SearchBar.Placeholder = "Search";
searchController.SearchResultsUpdater = this;
searchController.HidesNavigationBarDuringPresentation = false;
searchController.DimsBackgroundDuringPresentation = false;
NavigationItem.SearchController = searchController;
NavigationItem.HidesSearchBarWhenScrolling = false;
The results on iOS 11/12:
The results on iOS 13:
On iOS 13 I am using the new UINavigationBarAppearance code like this:
var appearance = new UINavigationBarAppearance();
appearance.ConfigureWithOpaqueBackground();
appearance.BackgroundColor = ColorPalette.TintColor;
appearance.TitleTextAttributes = new UIStringAttributes { ForegroundColor = UIColor.White };
NavigationItem.StandardAppearance = appearance;
On iOS 11/12 I am using legacy way to achieve it:
NavigationController.NavigationBar.BarStyle = UIBarStyle.Black;
NavigationController.NavigationBar.TintColor = UIColor.White;
NavigationController.NavigationBar.BarTintColor = ColorPalette.TintColor;
NavigationController.NavigationBar.Translucent = false;
I've tried a number of things, but can't seem to get the UISearchBar to tint by itself how iOS11/12 achieves it.
I know that the new UISearchBar now has access to the UITextField and I can configure the background color's etc.

Answer 1

searchBar.setSearchFieldBackgroundImage(UIImage(), for: .normal)
The code above has a side effect which removes corner radius of the text field.
Extension
extension UISearchBar {
  /// This solves iOS 13 issue which is a light gray overay covers the textField.
  /// - Parameter color: A color for searchField
  func setSearchFieldBackgroundColor(_ color: UIColor) {
    searchTextField.backgroundColor = color
    setSearchFieldBackgroundImage(UIImage(), for: .normal)
    // Make up the default cornerRadius changed by `setSearchFieldBackgroundImage(_:for:)`
    searchTextField.layer.cornerRadius = 10
    searchTextField.clipsToBounds = true
  }
}

Answer 2

There were several properties added in iOS 13, so you need to use them with the help of a conditional. For changing the background color, you have to use the BackgroundColor property of the SearchBar, like this
searchController.SearchBar.BackgroundColor = UIColor.Red;

Answer 3

Use a custom renderer and override the OnElementChanged method this way
protected override void OnElementChanged(ElementChangedEventArgs<SearchBar> e)
{
base.OnElementChanged(e);
if (Control != null)
{
if(UIDevice.CurrentDevice.CheckSystemVersion(13,0))
Control.SearchTextField.BackgroundColor = Element.BackgroundColor.ToUIColor();
}
}
later on, you don't have to do anything else and worked for me on ios 12 and ios 13+

Answer 4

On iOS 13, you have access to the internal UISearchTextField through the SearchTextField property, you can set it's background directly (in my case, I need the background to be white). Be sure to check the iOS version to avoid exceptions.
if(UIDevice.CurrentDevice.CheckSystemVersion(13,0))
{
searchController.SearchBar.SearchTextField.BackgroundColor = UIColor.White;
}

Answer 5

You can achieve desired result by adding couple of lines.
searchBar.barTintColor = UIColor.red
searchBar.searchTextField.backgroundColor = UIColor.white
Before you try this code please link IB Outlets for searchBar
#IBOutlet weak var searchBar: UISearchBar!