How can i remove this black line from custom navigation bar - ios

Question

Here what i done for custom navigation controller.i was added this code inside of viewDidLoad method.
import UIKit
class Login: UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
navigatonBar()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func navigatonBar(){
let codedLabel:UILabel = UILabel()
codedLabel.frame = CGRect(x: 0, y:-45, width: self.view.frame.width, height: 200)
codedLabel.textAlignment = .center
codedLabel.text = "Login"
codedLabel.textColor = .white
codedLabel.font=UIFont.systemFont(ofSize: 22)
let navigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width,height: 75))
navigationBar.backgroundColor = UIColor.red
navigationBar.isTranslucent = true
navigationBar.barTintColor = .red
self.view.addSubview(navigationBar)
self.view.addSubview(codedLabel)
}
}
but i am getting a Black line in the navigation

Answer 1

It is hard to determine the exact issue since you haven't posted all of your code, but my guess is that you have a UINavigationController with a custom view controller as the root view controller of the UINavigationController. If this is the case, I believe your issue is that you're adding a second navigation bar as a subview of your custom view controller's view. Don't do that. Remove the code below:
let codedLabel:UILabel = UILabel()
codedLabel.frame = CGRect(x: 0, y:-45, width: self.view.frame.width, height: 200)
codedLabel.textAlignment = .center
codedLabel.text = "Login"
codedLabel.textColor = .white
codedLabel.font=UIFont.systemFont(ofSize: 22)
let navigationBar = UINavigationBar(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width,height: 75))
navigationBar.backgroundColor = UIColor.red
navigationBar.isTranslucent = true
navigationBar.barTintColor = .red
self.view.addSubview(navigationBar)
self.view.addSubview(codedLabel)
and customize the UINavigationController's UINavigationBar:
self.title = "Login"
if let navigationBar = self.navigationController?.navigationBar {
navigationBar.backgroundColor = UIColor.red
navigationBar.isTranslucent = true
navigationBar.barTintColor = .red
navigationBar.titleTextAttributes = [NSAttributedStringKey.font: UIFont.systemFont(ofSize: 22), NSAttributedStringKey.foregroundColor: UIColor.white]
}

Answer 2

im pretty sure that is the shadowImage, to remove it just add this navigationBar.shadowImage = UIImage(), doesn't work if you set it to nil (nil is the default value). Edit: I missed the translucent point, set translucent to false, if don't the nav bar will add a UIVisualEffect on the navBar code : navigationBar.isTranslucent = false