image for nav bar button item swift

Question

I want to display an image in the left hand side of my nav bar in swift.

I have tried adding a nav bar button item and setting an image there.

The problem is

Answer 1

Swift 4 and 5:

let imageView = UIImageView(image: UIImage(named: "Harp"))
let buttonItem = UIBarButtonItem(customView: imageView)
self.navigationItem.leftBarButtonItem = buttonItem