possible fix for navigationBar bottom line

@@ -82,6 +82,9 @@ extension UIViewController {
         // self.navigationController?.navigationBar.hideBottomHairline()
         self.navigationController?.hideHairline()
 
+        self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for:.default)
+        self.navigationController?.navigationBar.shadowImage = UIImage()
+        self.navigationController?.navigationBar.layoutIfNeeded()
     }