ios - 尝试实用地调用另一个类中的导航栏功能

Question

我创建了一个导航栏，我试图在另一个 View Controller 中调用它。我通过调用我分成左、中、右按钮的方法来设置它。在我的其他 Controller 中，我调用 navbarcontroller 并尝试调用我为其设置导航工具栏的方法。没有任何反应，但是没有崩溃。

import UIKit

class NavBarController : UIViewController{

var screenSize: CGRect!

override func viewDidLoad() {
    super.viewDidLoad()

    setupNavigationBarItems()
    setupToolBarItems()

    self.navigationController?.isToolbarHidden = false
    self.view!.backgroundColor = .white

}

我的导航栏方法是这样的

func setupNavigationBarItems() {
    setupCenterNavButton()
    setupLeftNavButton()
    setupRightNavButton()
}
func showCalendarController() {
    let navController = CalendarController()
    self.present(navController, animated: true, completion: nil)
} //connect bottom bar buttons to controller
func showEventsController() {
    let navController = EventsController()
    self.present(navController, animated: true, completion: nil)
} //connect bottom bar buttons to controller

func setupNavigationBarItems() {
    setupCenterNavButton()
    setupLeftNavButton()
    setupRightNavButton()
} // top bar button setup

private func setupCenterNavButton() {
    let buttonFrame = UIView(frame: CGRect(x: 0, y: 0, width: 165, 
height: 20))
    mainFeedButton.frame = CGRect(x: 0,y: 0, width: 80,height: 20) as 
CGRect
    mainFeedButton.backgroundColor = UIColor.blue
    peekFeedButton.frame = CGRect(x: 85,y: 0, width: 80,height: 20) as 
CGRect
    peekFeedButton.backgroundColor = UIColor.blue
    buttonFrame.addSubview(mainFeedButton)
    buttonFrame.addSubview(peekFeedButton)
    navigationItem.titleView = buttonFrame
} //center bar buttons / action setup

private func setupLeftNavButton() {
    navigationItem.leftBarButtonItem = UIBarButtonItem(customView: 
favoriteButton)
}// left bar buttons / action setup

private func setupRightNavButton() {
    navigationItem.rightBarButtonItem = UIBarButtonItem(customView: 
moreButton)
} //right bar buttons / action setup

lazy var mainFeedButton: UIButton! = {
    let button = UIButton(type: .custom) // button type
    button.setTitle("Main",for: .normal) //button title
    button.sizeToFit()  // size button to fit the title
    var frame = button.frame //create frame to manipulate the body
    button.frame = CGRect(x: 0, y: 0, width: 100, height: 40)
    button.addTarget(self, action: 
#selector(self.showMainFeedController),
                     for: .touchUpInside)
    return button
}() //mainFeed button connected to Feed Controller

lazy var peekFeedButton: UIButton! = {
    let button = UIButton(type: .custom) //button type
    button.setTitle("Spy",for: .normal) //button title
    button.sizeToFit()  // size button to fit the title
    var frame = button.frame //create frame to manipulate the body
    button.frame = CGRect(x: 20, y: 0, width: 100, height: 40)
    button.addTarget(self, action: 
#selector(self.showSpyFeedController),
                     for: .touchUpInside)
    return button
}()//peekFeed button frame and action setup 

lazy var favoriteButton: UIButton! = {
    let button = UIButton(type: .system) //default button with blue 
text
    button.setImage(#imageLiteral(resourceName: 
"star").withRenderingMode(.alwaysOriginal), for: .normal)
    button.contentMode = .scaleAspectFit
    button.frame = CGRect(x: 0, y: 0, width: 24, height: 24)
    button.addTarget(self, action: #selector(favoriteButton_tapped),
                     for: .touchUpInside)
    return button
}() //favorites button frame and action setup

lazy var moreButton: UIButton! = {
    let button = UIButton(type: .system) //default button with blue 
text
    button.setImage(#imageLiteral(resourceName: 
"more").withRenderingMode(.alwaysOriginal), for: .normal)
    button.contentMode = .scaleAspectFit
    button.frame = CGRect(x: 0, y: 0, width: 24, height: 24)
    button.addTarget(self, action: #selector(moreButton_tapped),
                     for: .touchUpInside)
    return button
}() //more button frame and action setup

func showMainFeedController() {
    let navController = MainFeedController()
    self.present(navController, animated: true, completion: nil)
} //mainFeed button connected to Feed Controller
func showSpyFeedController() {
    let navController = SpyFeedController()
    self.present(navController, animated: true, completion: nil)
}//peekFeed button connected to SpyFeedController
func favoriteButton_tapped(sender: UIButton) {
    print("You touched this!")
}
func moreButton_tapped(sender: UIButton) {
    print("You touched this!")
}
}

然后我尝试像这样通过 setupNavigationBarItems() 调用该函数

import UIKit

class EventsController: UIViewController{

    override func viewDidLoad() {
        super.viewDidLoad()

        let navbar = NavBarController()
        navbar.setupNavigationBarItems()
        self.navigationController?.isToolbarHidden = false
        self.view.backgroundColor = .white

     }
}

我不确定这是否有效。我对这一切还是有点陌生​​。

Answer 1

不清楚您期望发生什么，但确实发生了:

    let navbar = NavBarController()

创建了一个全新的 NavBarController 对象。

    navbar.setupNavigationBarItems()

NavBarController 对象的 setupNavigationBarItems 被调用。

    self.navigationController?.isToolbarHidden = false
    self.view.backgroundColor = .white

您的代码结束。 navbar 是一个局部变量，因此 NavBarController 对象消失在一阵烟雾中。结束。此对象的创建和配置没有任何意义。