remove black border from UISearchController search bar swift - ios

Question

I have a UISearchController in my tableView. Also note that there is a navigation item in the top.
My issue is that i have a black border in the top and bottom when I load the page, however, it is not present when I click the search bar.
Search bar on page load (with black border):
After clicking on search bar (no black border):
Here is the code related:
let searchController = UISearchController(searchResultsController: nil)
in viewDidLoad:
searchController.searchBar.barTintColor = UIColor.redColor()
searchController.searchBar.tintColor = UIColor.whiteColor()
I followed several similar questions and made the following changes after the above lines in viewDidLoad():
1) searchController.searchBar.backgroundImage = UIImage()
2) searchController.searchBar.searchBarStyle = UISearchBarStyle.Minimal
3) searchController.searchBar.layer.borderColor = UIColor.clearColor().CGColor
4)
searchBar.layer.borderWidth = 1
searchBar.layer.borderColor = UIColor.whiteColor().CGColor
None worked. Is this an issue with the order I am using the code, or how would I get rid of these lines?

Answer 1

Fixed this after a lot of search. Here's how i did it. In viewDidLoad, added the following lines:
self.searchController.searchBar.translucent = false
self.searchController.searchBar.backgroundImage = UIImage()
self.searchController.searchBar.barTintColor = UIColor.redColor()
self.searchController.searchBar.tintColor = UIColor.whiteColor()
After that in app.delegate file in didFinishLaunchingWithOptions added the following code:
let backgroundColor = UIColor.redColor()
let foregroundColor = UIColor.whiteColor()
UIApplication.sharedApplication().statusBarStyle = .LightContent
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(backgroundColor.toImage(), forBarMetrics: UIBarMetrics.Default)
UINavigationBar.appearance().tintColor = foregroundColor
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName: foregroundColor]
Also need this extension on the app.delegate file (place outside of the class)
extension UIColor{
func toImage() -> UIImage {
let rect = CGRectMake(0, 0, 1, 1)
UIGraphicsBeginImageContextWithOptions(rect.size, true, 0)
self.setFill()
UIRectFill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
(Thanks to Noel for the extension taken from this answer)
And finally, the desired result:

Answer 2

I think it is the navigation bar you need to remove the border for.
How to hide iOS7 UINavigationBar 1px bottom line

Answer 3

For iOS 13 / Swift 5; the following line makes the trick:
UISearchBar.setBackgroundImage(UIImage(), for: .any, barMetrics: .default)
Cheers!