Change navigation bar bottom border color Swift

Question

It works with

import UIKit

class ViewController: UIViewController {

override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup a         


        

Answer 1

Putting @alessandro-orru's answer in one extension

extension UINavigationController {

    func setNavigationBarBorderColor(_ color:UIColor) {
        self.navigationBar.shadowImage = color.as1ptImage()
    }
}

extension UIColor {

    /// Converts this `UIColor` instance to a 1x1 `UIImage` instance and returns it.
    ///
    /// - Returns: `self` as a 1x1 `UIImage`.
    func as1ptImage() -> UIImage {
        UIGraphicsBeginImageContext(CGSize(width: 1, height: 1))
        setFill()
        UIGraphicsGetCurrentContext()?.fill(CGRect(x: 0, y: 0, width: 1, height: 1))
        let image = UIGraphicsGetImageFromCurrentImageContext() ?? UIImage()
        UIGraphicsEndImageContext()
        return image
    }
}

then in your view controller just add:

self.navigationController?.setNavigationBarBorderColor(UIColor.red)