Add custom button to navigation controller without border

Question

I add custom button to navigation controller

    UIBarButtonItem *backButton = [[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@\"back.png\"]
                  


        

Answer 1

For Swift 4

let backButton = UIButton(frame: CGRect(x: 0, y: 0, width: 25, height: 25))
backButton.setImage(UIImage(named: "back.png"), for: .normal)
backButton.addTarget(self, action: #selector(backAction), for: .touchUpInside)
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: backButton)

And action (selector) should be like the following :

@objc func backAction () {
        // do the magic 
}