ios - 在同一个标​​签栏项目上加载新的 viewController 不起作用

Question

所以我在同一个标​​签栏项目上加载新的 View Controller 时遇到问题。我有一个标签栏 Controller 作为我的根 Controller ，标签栏上有 4 个标签。其中之一是帐户选项卡，当用户登录时，他需要查看其帐户详细信息的概述，但是当没有用户时，该选项卡栏项目上需要有一个登录/登录页面。目前，我有一个用于我的 tabbarcontroller 的自定义选项卡栏类，它具有我认为是解决方案但没有任何 react 的功能。我在需要加载的 View Controller (用户详细信息页面)中放置了一个断点，它出现在 ViewDidLoad 中，因此它加载但它没有出现在屏幕上。

希望我终于可以解决这个问题!

亲切的问候
B.

这是我的自定义标签栏 Controller 类:

import UIKit

class TabBarViewController: UITabBarController, UITabBarControllerDelegate {
    var window: UIWindow?
    override func viewDidLoad() {
        super.viewDidLoad()
        self.delegate = self

    }


    func tabBarController(_ tabBarController: UITabBarController,
                          shouldSelect viewController: UIViewController) -> Bool{
        let frame = UIScreen.main.bounds
        window = UIWindow(frame: frame)
        let index = tabBarController.viewControllers?.firstIndex(of: viewController)
        if index == 3{ // Index of Account tab
            let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let loginVC = mainStoryBoard.instantiateViewController(withIdentifier: "MessagesViewController") as! MessagesViewController
            window?.rootViewController = loginVC
            window?.makeKeyAndVisible()
        }
        return true// you decide
    }
}

Answer 1

这是呈现全屏 loginVc 的代码

func tabBarController(_ tabBarController: UITabBarController,
                          shouldSelect viewController: UIViewController) -> Bool{
        let frame = UIScreen.main.bounds
        window = UIWindow(frame: frame)
        let index = tabBarController.viewControllers?.firstIndex(of: viewController)
        if index == 1{ // Index of Account tab
            let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let loginVC = mainStoryBoard.instantiateViewController(withIdentifier: "MessagesViewController") as! MessagesViewController
            loginVC.modalPresentationStyle = .fullScreen
            self.present(loginVC, animated: false, completion: nil)
        }
        return true// you decide
    }

如果你还想有底栏......你的那个viewController应该是Navigation Controller，你可以推送你想要的ViewController然后喜欢

func tabBarController(_ tabBarController: UITabBarController,
                          shouldSelect viewController: UIViewController) -> Bool{
        let frame = UIScreen.main.bounds
        window = UIWindow(frame: frame)
        let index = tabBarController.viewControllers?.firstIndex(of: viewController)
        if index == 1{ // Index of Account tab
            let mainStoryBoard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
            let loginVC = mainStoryBoard.instantiateViewController(withIdentifier: "MessagesViewController") as! MessagesViewController
           // loginVC.modalPresentationStyle = .fullScreen

            if let navigation = viewController as? UINavigationController {

                navigation.pushViewController(loginVC, animated: false)
            }
        }
        return true// you decide
    }

它将在顶部显示返回按钮和导航栏
如果你不想要 NavigationBar，那么在你的 MessagesViewController加载函数调用

override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationController?.isNavigationBarHidden = true
        // Do any additional setup after loading the view.
    }

如果您只想隐藏后退按钮，请调用

override func viewDidLoad() {
        super.viewDidLoad()
        self.navigationItem.setHidesBackButton(true, animated: false);
        // Do any additional setup after loading the view.
    }