Add custom button to navigation controller without border

Try this.

UIButton *backButton = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, button_width, button_height)];[backButton setImage:[UIImage imageNamed:@"back.png"] forState:UIControlStateNormal];[backButton addTarget:self action:@selector(backAction) forControlEvents:UIControlEventTouchUpInside];self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:backButton];

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 }

Adding Button either in left or right with title or without title as per the requirement,

func addBarButton(image: UIImage?, isLeft: Bool = true, title: String? = nil, font: UIFont = UIFont.systemFont(ofSize: 16), tintColor: UIColor = R.color.textfieldColor() ?? .black) {            if let navController = self.navigationController {                let navBar = navController.navigationBar                navBar.isHidden = false                navBar.isTranslucent = false                let btn = UIButton.init(type: .custom)                if let img = image {                    btn.setImage(img, for: UIControl.State.normal)                }                if let titleTxt = title {                    btn.setTitle(titleTxt, for: .normal)                    btn.setTitleColor(tintColor, for: .normal)                    btn.titleLabel?.font = font                }                btn.frame = CGRect.init(x: 0, y: 0, width: 35, height: 35)                btn.adjustsImageWhenHighlighted = false                let barButton = UIBarButtonItem.init(customView: btn)                if isLeft {                    btn.addTarget(self, action: #selector(self.btnLeftNavigationClicked), for: UIControl.Event.touchUpInside)                    btn.tintColor = tintColor                    if let tabBar = self.tabBarController {                        tabBar.navigationItem.leftBarButtonItem = nil                        tabBar.navigationItem.leftBarButtonItem = barButton                    } else {                        self.navigationItem.leftBarButtonItem = nil                        self.navigationItem.leftBarButtonItem = barButton                    }                } else {                    btn.addTarget(self, action: #selector(self.btnRightNavigationClicked), for: UIControl.Event.touchUpInside)                    btn.tintColor = tintColor                    if let tabBar = self.tabBarController {                        tabBar.navigationItem.rightBarButtonItem = barButton                    } else {                        self.navigationItem.rightBarButtonItem = barButton                    }                }            }        }

Right button action

@objc func btnRightNavigationClicked(sender: UIButton) {    // add your logic here         }

Left button action

@objc func btnLeftNavigationClicked(sender: UIButton) {        guard let navigationController = self.navigationController else {            return        }        navigationController.popViewController(animated: true)}