ios - 当点击通知时，在 rootViewController 上显示 viewController

Question

当应用程序处于终止状态并且我收到推送通知时。如果我查看我希望应用程序正常加载，但它应该在 rootViewController 上显示一个 viewController，我为其添加了一个关闭按钮，每当我点击此按钮时我只想关闭这个 viewController。

在我通过通知打开应用程序时调用的方法中，我已经这样做了:

func userNotificationCenter(_ center: UNUserNotificationCenter,
                                didReceive response: UNNotificationResponse,
                                withCompletionHandler completionHandler: @escaping () -> Void) {
    let tabBarController = self.window!.rootViewController as! UITabBarController
    self.window?.rootViewController = tabBarController
    let storyboard: UIStoryboard = UIStoryboard(name: "Main", bundle: nil)
    apptVC = storyboard.instantiateViewController(withIdentifier: "NotificationVC") as! NotificationsViewController
    window?.makeKeyAndVisible()
    window?.rootViewController?.present(apptVC, animated: true, completion: nil)
completionHandler()
    }
}

但不幸的是，当我这样做时，应用程序崩溃了。我已经使用 firebase 实现了推送通知。我希望应用程序正常运行，就像在用户收到通知时在启动时在 Root View Controller 上呈现一个 View Controller 一样。

更新
这是我的 Storyboard的截图:

Answer 1

所以你需要先满足标签栏 Controller :

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController

然后用你想要的 View Controller 来满足所有的 UINavigationControllers:

let firstNavigationController = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController

let NotificationVC = storyboard.instantiateViewController(withIdentifier: "NotificationVC") as! NotificationsViewController

并将它们全部作为标签栏 Controller 的viewControllers:

tabBarController.viewControllers = [firstNavigationController]

哪个导航 Controller 应该出现在这个 View Controller 中？例如:

tabBarController.selectedViewController == firstNavigationController {
    firstNavigationController.present(NotificationVC, animated: true, completion: nil)
}

这是最后一件事:

self.window = UIWindow.init(frame: UIScreen.main.bounds)
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()

注意 这只是推荐，因此我使用了一个UNavigationController

所以我创建了一个名为 present() 的函数。

func present() {

let storyboard = UIStoryboard.init(name: "YourStoryboardName", bundle: nil)
let tabBarController = storyboard.instantiateViewController(withIdentifier: "YourTabBarController") as! UITabBarController
let firstNavigationController = storyboard.instantiateViewiController(withIdentifier: "YourFirstNavigationController") as! UINavigationController
let NotificationVC = storyboard.instantiateViewController(withIdentifier: "NotificationVC") as! NotificationsViewController

tabBarController.viewControllers = [firstNavigationController]

tabBarController.selectedViewController == firstNavigationController {
        firstNavigationController.present(NotificationVC, animated: true, completion: nil)
 }

self.window = UIWindow.init(frame: UIScreen.main.bounds)   
self.window?.rootViewController = tabBarController
self.window?.makeKeyAndVisible()


    }
}

但它没有用，即使我认为这是无用的。每当点击通知时，我们都需要一个 Action 。我们应该像这样检查一个 Action identifier:

extension AppDelegate: UNUserNotificationCenterDelegate {

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {

        switch response.actionIdentifier {
        case UNNotificationDefaultActionIdentifier:
            self.present()
            completionHandler()

        default:
            break;
        }
    }
}

希望对你有帮助