连接到 tabbarcontroller 时，无法在 swift 4.2 的导航栏上显示 barbutton 项目？答案

【问题标题】：Not able to display barbutton items on navigation bar in swift 4.2 when connected to tabbarcontroller?连接到 tabbarcontroller 时，无法在 swift 4.2 的导航栏上显示 barbutton 项目？
【发布时间】：2018-11-27 08:15:51
【问题描述】：

我已经像这样链接了navigationController 和tabBarController

let mainStoryboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
let viewController = mainStoryboard.instantiateViewController(withIdentifier: "TabAction") as UIViewController
self.window = UIWindow(frame: UIScreen.main.bounds)
self.window?.rootViewController = UINavigationController(rootViewController: TabBarController())
self.window?.makeKeyAndVisible()
let navigationController = UINavigationController.init(rootViewController: viewController)
UIApplication.shared.keyWindow?.rootViewController = viewController
self.window?.rootViewController = navigationController
self.window?.makeKeyAndVisible()

视图控制器中 barbutton 项的代码：

super.viewDidLoad()
    // registering table
    recruitmentDbView?.register(UINib(nibName: "recruitmentDashboardCell", bundle: nil), forCellReuseIdentifier: "CustomCell")
    // setting colour to navigation bar
    self.navigationController?.navigationBar.barTintColor = UIColor(red: 18/255, green: 41/255, blue: 50/255, alpha: 1)
    // setting barbutton items on navigation bar
    let rightFilterBarButtonItem: UIBarButtonItem = UIBarButtonItem(image: UIImage(named: "FilterIcon"), style: .plain, target: self, action: nil)
    rightFilterBarButtonItem.tintColor = UIColor.white
    let rightSearchBarButtonItem: UIBarButtonItem = UIBarButtonItem(image: UIImage(named: "SearchIcon"), style: .plain, target: self, action: nil)
    rightSearchBarButtonItem.tintColor = UIColor.white

    self.navigationItem.rightBarButtonItems = [rightFilterBarButtonItem,rightSearchBarButtonItem]
    self.navigationItem.leftBarButtonItem?.isEnabled = true
    self.navigationItem.backBarButtonItem?.isEnabled = false
    let leftBackBarButtonItem: UIBarButtonItem = UIBarButtonItem(image: UIImage(named: "BackIcon"), style: .plain, target: self, action: nil)
    self.navigationItem.leftBarButtonItem = leftBackBarButtonItem
    self.navigationItem.title = "Recruit - Dashboard"

    let textAttributes = [NSAttributedString .Key.foregroundColor:UIColor.white]
    self.navigationController?.navigationBar.titleTextAttributes = textAttributes
}

【问题讨论】：

标签： ios swift uitabbarcontroller uibarbuttonitem

【解决方案1】：

试试这个代码：-

let button1 = UIBarButtonItem(image: UIImage(named: "imagename"), style: .plain, target: self, action: selector: #selector(action1)) // 
self.navigationItem.rightBarButtonItem  = button1


let filterIcon    = UIImage(named: "FilterIcon")!
let searchImage  = UIImage(named: "SearchIcon")!

let rightFilterBarButtonItem  = UIBarButtonItem(image: filterIcon,  style: .Plain, target: self, selector: #selector(action2))
let rightSearchBarButtonItem = UIBarButtonItem(image: searchImage,  style: .Plain, target: self, selector: #selector(action3))

 navigationItem.rightBarButtonItems = [rightFilterBarButtonItem, rightFilterBarButtonItem]


 @objc func action1()
    {

    }
    @objc func action2()
    {
      ProgressViewVc.sharedInstance.showProcessView()
    }

 @objc func action3()
    {
      ProgressViewVc.sharedInstance.showProcessView()
    }

【讨论】：