Swift 5: iOS: 13.1 removes the navigation bar on a per-viewcontroller basis. Use this method if you want to show full screen image with no navigation bar obscuring your view. Title and Prompt can be added if desired

Transparent Navigation Bar.swift

override func viewWillAppear(_ animated: Bool) {
	super.viewWillAppear(animated)

	// Provide a clear background for the navigaion bar
	navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
	navigationController?.navigationBar.shadowImage = UIImage()
	navigationController?.navigationBar.isTranslucent = true
}

override func viewWillDisappear(_ animated: Bool) {
	super.viewWillDisappear(animated)
	// Restore default navigation bar before exiting view
	navigationController?.navigationBar.setBackgroundImage(nil, for: .default)
	navigationController?.navigationBar.shadowImage = nil
}

this now crashes on the UIImage() line under the iOS update that released today