Navigation bar items

CustomNavigationBar.swift

    fileprivate func setOriginalBackImage(selector:Selector) {
        let backButton = UIBarButtonItem(image: UIImage(named: "nav_back_btn")?.withRenderingMode(.alwaysOriginal), style: .plain, target: self, action: selector)
        backButton.tintColor?.withAlphaComponent(0.3)
        self.navigationItem.leftBarButtonItem = backButton
    }

    fileprivate func setOnlyTitleWithoutBackButton(title:String) { // just display title on nav bar without back button 
        let label = UILabel(frame: CGRect(x: 0, y: 0, width: 150, height: 44))
        label.text = title
        label.font = UIFont(name: Constants.MabryFonts.REGULAR, size: 16)
        label.textColor = UIColor(red: 24/255, green: 36/255, blue: 52/255, alpha: 1)
        label.textAlignment = .center
        self.navigationItem.titleView = label
    }

    fileprivate func showLocationSearchOnNavBar(leftSelector:Selector) -> UITextField { // show navigation bar with text field in center
        setOriginalBackImage(selector: leftSelector)
        let view = UIView(frame: CGRect(x: 0, y: 0, width: self.view.frame.size.width-60, height: self.navigationController?.navigationBar.frame.size.height ?? 44))
        view.backgroundColor = .clear
        let field = UITextField(frame: view.frame)
        field.borderStyle = .none
        field.placeholder = "Find a neighbourhood, address or zip"
        field.textColor = UIColor(red: 24/255, green: 36/255, blue: 52/255, alpha: 1)
        field.backgroundColor = .clear
        field.clearButtonMode = .whileEditing
        view.addSubview(field)
        self.navigationItem.titleView = view
        return field
    }