将容器控制器（根视图控制器）设置为 UITabBarController 中视图控制器的委托

Posted 2023-03-22

【中文标题】将容器控制器（根视图控制器）设置为 UITabBarController 中视图控制器的委托

【英文标题】：Setting Container Controller (Root View Controller) as Delegate for View Controllers in UITabBarController

【发布时间】：2020-04-18 18:17:30

【问题描述】：

我正在尝试将容器控制器（根视图控制器）设置为选项卡栏控制器中视图控制器的导航栏项的委托，并且无法弄清楚如何在不使用的情况下执行此操作：

let rootViewController = UIApplication.shared.keyWindow?.rootViewController

此代码可以按我的意愿工作：

 let rootViewController = UIApplication.shared.keyWindow?.rootViewController

    guard let doghouseViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "DoghouseVC") as? DoghouseViewController else  return 
    doghouseViewController.delegate = rootViewController as? DoghouseViewControllerDelegate
    let nav1 = UINavigationController(rootViewController: doghouseViewController)
    guard let statsViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "StatsVC") as? StatsViewController else  return 
    statsViewController.delegate = rootViewController as? StatsViewControllerDelegate
    let nav2 = UINavigationController(rootViewController: statsViewController)

    dailyWrapUpViewController = DailyWrapUpViewController()

    guard let calendarViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CalendarVC") as? CalendarViewController else  return 
    calendarViewController.delegate = rootViewController as? CalendarViewControllerDelegate
    let nav3 = UINavigationController(rootViewController: calendarViewController)
    guard let settingsViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SettingsVC") as? SettingsViewController else  return 
    settingsViewController.delegate = rootViewController as? SettingsViewControllerDelegate
    let nav4 = UINavigationController(rootViewController: settingsViewController)

    doghouseViewController.tabBarItem = UITabBarItem(title: "Doghouse", image: UIImage(named: "doghouse"), tag: 0)
    statsViewController.tabBarItem = UITabBarItem(title: "Stats", image: UIImage(named: "stats"), tag: 1)

    // Custom Doggy Bag Button
    let controller2 = UIViewController()

    calendarViewController.tabBarItem = UITabBarItem(title: "Calendar", image: UIImage(named: "calendar"), tag: 3)
    settingsViewController.tabBarItem = UITabBarItem(title: "More", image: UIImage(named: "more"), tag: 4)

    viewControllers = [nav1, nav2, controller2, nav3, nav4]

    // Use the view controller reference to select the second tab
    selectedViewController = nav1

但是，“keyWindow”在 ios 13.0 中已被弃用，如果我尝试使用以下示例更改它，则委托功能不起作用（按钮被按下，但容器控制器实例没有收到）：

let rootViewController = UIApplication.shared.windows.first!.rootViewController as! ContainerController

关于更多上下文，容器控制器（根视图控制器）是一个侧边菜单，点击 TabBarController 内的 NavBar Item 时会滑出。

我该如何解决这个问题？

【参考方案1】：

想通了：

let sceneDelegate = UIApplication.shared.connectedScenes.first!.delegate as! SceneDelegate

    guard let doghouseViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "DoghouseVC") as? DoghouseViewController else  return 
    doghouseViewController.delegate = sceneDelegate.window!.rootViewController as? DoghouseViewControllerDelegate
    let nav1 = UINavigationController(rootViewController: doghouseViewController)
    guard let statsViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "StatsVC") as? StatsViewController else  return 
    statsViewController.delegate = sceneDelegate.window!.rootViewController as? StatsViewControllerDelegate
    let nav2 = UINavigationController(rootViewController: statsViewController)

    dailyWrapUpViewController = DailyWrapUpViewController()

    guard let calendarViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "CalendarVC") as? CalendarViewController else  return 
    calendarViewController.delegate = sceneDelegate.window!.rootViewController as? CalendarViewControllerDelegate
    let nav3 = UINavigationController(rootViewController: calendarViewController)
    guard let settingsViewController = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "SettingsVC") as? SettingsViewController else  return 
    settingsViewController.delegate = sceneDelegate.window!.rootViewController as? SettingsViewControllerDelegate
    let nav4 = UINavigationController(rootViewController: settingsViewController)

    doghouseViewController.tabBarItem = UITabBarItem(title: "Doghouse", image: UIImage(named: "doghouse"), tag: 0)
    statsViewController.tabBarItem = UITabBarItem(title: "Stats", image: UIImage(named: "stats"), tag: 1)

    // Custom Doggy Bag Button
    let controller2 = UIViewController()

    calendarViewController.tabBarItem = UITabBarItem(title: "Calendar", image: UIImage(named: "calendar"), tag: 3)
    settingsViewController.tabBarItem = UITabBarItem(title: "More", image: UIImage(named: "more"), tag: 4)

    viewControllers = [nav1, nav2, controller2, nav3, nav4]

    // Use the view controller reference to select the second tab
    selectedViewController = nav1