Make navigation bar transparent regarding below image in iOS 8.1

Question

I try to set my navigation bar transparent regarding a image below this, something like the following image :

Answer 1

self.navigationController?.navigationBar.setBackgroundImage(UIImage(), for: .default)
self.navigationController?.navigationBar.shadowImage = UIImage()
self.navigationController?.navigationBar.backgroundColor = UIColor.clear
self.navigationController?.navigationBar.isTranslucent = true

If the above code is not working then set edgesForExtendedLayout to all.

self.edgesForExtendedLayout = .all