Swift：无需Storyboard标识符，从登录页导航至代码创建的TabBar页面

已移除Storyboard中的TabBar，完全通过代码创建TabBar。现需实现：不依赖Storyboard标识符，从登录屏幕导航到旅行列表屏幕（旅行列表位于代码创建的TabBar的某个标签页中）。

旧代码（依赖Storyboard标识符）：

func goToNextScreen() {
        performSegue(withIdentifier: "GoToTravelListScreen", sender: userLoged)
    }
    
    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        
        if segue.identifier == "GoToTravelListScreen" {
            let storyboard = UIStoryboard(name: "Main", bundle: Bundle.main)
            let listTravelVC = storyboard.instantiateViewController(withIdentifier: "mainTabBar") as! UITabBarController
            listTravelVC.modalPresentationStyle = .fullScreen
            self.present(listTravelVC, animated: true, completion: {
                let navController = listTravelVC.viewControllers![0] as! UINavigationController
                let vc = navController.topViewController as! TravelListViewController
                vc.userLoged = self.userLoged
            })
        }
    }

1. 先实现纯代码版的TabBarController #

定义自定义UITabBarController子类，在其中通过代码组装所有标签页的视图控制器，包括旅行列表所在的导航控制器：

class CustomTabBarController: UITabBarController {
    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 创建旅行列表控制器并包装进导航控制器
        let travelListVC = TravelListViewController()
        let travelNav = UINavigationController(rootViewController: travelListVC)
        travelNav.tabBarItem = UITabBarItem(title: "旅行列表", image: UIImage(systemName: "list.bullet"), tag: 0)
        
        // 可添加其他标签页示例
        let profileVC = UIViewController()
        let profileNav = UINavigationController(rootViewController: profileVC)
        profileNav.tabBarItem = UITabBarItem(title: "我的", image: UIImage(systemName: "person"), tag: 1)
        
        // 设置TabBar的子控制器数组
        self.viewControllers = [travelNav, profileNav]
    }
}

2. 修改登录页的导航逻辑 #

去掉performSegue和所有Storyboard相关代码，直接实例化自定义TabBarController并完成参数传递：

func goToNextScreen() {
    // 实例化纯代码创建的TabBar控制器
    let tabBarVC = CustomTabBarController()
    tabBarVC.modalPresentationStyle = .fullScreen
    
    // 直接获取旅行列表控制器并传递用户数据
    if let travelNav = tabBarVC.viewControllers?.first as? UINavigationController,
       let travelListVC = travelNav.topViewController as? TravelListViewController {
        travelListVC.userLoged = self.userLoged
    }
    
    // 跳转至TabBar页面
    self.present(tabBarVC, animated: true)
}

核心要点 #

• 彻底脱离Storyboard：所有视图控制器均通过代码初始化，无需在Storyboard中配置标识符或segue。
• 参数传递更安全：在present前即可获取目标控制器并设置参数，避免闭包内强制解包的潜在风险。

内容的提问来源于stack exchange，提问作者Boguhe Stephane