捕获UITaBbarViewController项目选择以决定是否显示它

import UIKit

class MyTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let vc1 = UIViewController()
        vc1.tabBarItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
        
        let vc2 = UIViewController()
        vc2.tabBarItem = UITabBarItem(title: "Profile", image: UIImage(systemName: "person"), tag: 1)
        
        viewControllers = [vc1, vc2]
    }
}

class MyTabBarController: UITabBarController {
    var isUserLoggedIn = false
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let vc1 = UIViewController()
        vc1.tabBarItem = UITabBarItem(title: "Home", image: UIImage(systemName: "house"), tag: 0)
        
        let vc2 = UIViewController()
        vc2.tabBarItem = UITabBarItem(title: "Profile", image: UIImage(systemName: "person"), tag: 1)
        
        updateTabBarItems()
    }
    
    func updateTabBarItems() {
        if isUserLoggedIn {
            viewControllers = [vc1, vc2]
        } else {
            viewControllers = [vc1]
        }
    }
}

class MyTabBarController: UITabBarController {
    var isUserLoggedIn = false
    
    // ... 其他代码 ...
    
    func userDidLogin() {
        isUserLoggedIn = true
        updateTabBarItems()
    }
    
    func userDidLogout() {
        isUserLoggedIn = false
        updateTabBarItems()
    }
}

func updateTabBarItems() {
    if isUserLoggedIn {
        setViewControllers([vc1, vc2], animated: true)
    } else {
        setViewControllers([vc1], animated: true)
    }
}

let vc2 = UIViewController()
vc2.tabBarItem = UITabBarItem(title: "Profile", image: UIImage(systemName: "person"), tag: 1)