Swift 3 remove line underneath navbar - swift

Question

When my project was in Swift 2, I had this code that worked:
extension UINavigationController {
func hairLine(hide: Bool) {
//hides hairline at the bottom of the navigationbar
for subview in self.navigationBar.subviews {
if subview.isKind(of: UIImageView.self) {
for hairline in subview.subviews {
if hairline.isKind(of: UIImageView.self) && hairline.bounds.height <= 1.0 {
hairline.isHidden = hide
}
}
}
}
}
}
But now something changed and it doesn't work. Not sure if it because of Swift 3, or iOS10, or that I'm now testing with a 7plus vs a 6s, but it no longer works. I would call in it viewWillAppear of the view controller that is being shown. I saw an answer on here saying to use
UINavigationBar.appearance().shadowImage = UIImage()
UINavigationBar.appearance().setBackgroundImage(UIImage(), for: .default)
but that hasn't worked. I tried replacing the content of my old hairLine() with those 2 lines, tried putting them directly in viewWillAppear and viewDidAppear but still doesn't work for me.

Answer 1

Try this
self.navigationController?.navigationBar.setValue(true, forKey: "hidesShadow")

Answer 2

Before:
After:
Code:
override func viewDidLoad() {
super.viewDidLoad()
navigationItem.title = "Hello World"
let navbarColor = UIColor(colorLiteralRed: (247/255), green: (247/255), blue: (247/255), alpha: 1)
let image = UIImage()
navigationController?.navigationBar.setBackgroundImage(image, for: .default)
navigationController?.navigationBar.shadowImage = image
navigationController?.navigationBar.backgroundColor = navbarColor
let statusBarHeight = UIApplication.shared.statusBarFrame.height
let statusBarWidth = UIScreen.main.bounds.size.width
let statusBarView = UIView(frame: CGRect(x: 0, y: 0, width: statusBarWidth, height: statusBarHeight))
statusBarView.backgroundColor = navbarColor
view.addSubview(statusBarView)
}

Answer 3

Try:
self.navigationController?.navigationBar.setBackgroundImage(_:UIImage(),
for: .any,
barMetrics: .default)
self.navigationController?.navigationBar.shadowImage = UIImage()
in viewDidLoad()

Answer 4

Try this
UINavigationBar.appearance().setBackgroundImage(_:
nil,
for: .any,
barMetrics: .default)
UINavigationBar.appearance().shadowImage = nil