Spring加载UITabbarItem以在iOS 11中导航

import UIKit
import Spring

class TabBarController: UIViewController, UITabBarControllerDelegate {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建UITabbarController
        let tabBarController = UITabBarController()
        tabBarController.delegate = self
        
        // 创建UITabbarItem
        let item1 = SpringTabbarItem(title: "Home", image: UIImage(named: "home"))
        let item2 = SpringTabbarItem(title: "Profile", image: UIImage(named: "profile"))
        
        // 创建视图控制器
        let homeViewController = HomeViewController()
        let profileViewController = ProfileViewController()
        
        // 设置UITabbarItem的视图控制器
        item1.viewController = homeViewController
        item2.viewController = profileViewController
        
        // 将UITabbarItem添加到UITabbarController
        tabBarController.viewControllers = [item1, item2]
        
        // 设置根视图控制器
        self.addChild(tabBarController)
        self.view.addSubview(tabBarController.view)
        tabBarController.didMove(toParent: self)
    }
    
    // 实现导航功能
    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController) {
        if let navigationController = tabBarController.selectedViewController as? UINavigationController {
            navigationController.popToRootViewController(animated: false)
        }
    }
}

// 自定义SpringTabbarItem类
class SpringTabbarItem: UITabBarItem {
    var viewController: UIViewController?
    
    convenience init(title: String?, image: UIImage?) {
        self.init()
        self.title = title
        self.image = image
    }
}