推送通知 - 使用 SceneDelegate 在通知点击时推送 ViewController

Question

在 iOS 13 之前，导航控制器和根视图是在 AppDelegate 中定义的。然而，在 iOS 13 中，Apple 引入了 SceneDelegate，它接管了这些视图功能的处理。但是，AppDelegate 仍然处理诸如本地通知处理之类的事情。 See this answer for some code that outlines these changes for root views.

如果我想在用户点击本地通知时推送视图，我会在 AppDelegate 中执行以下操作：

extension AppDelegate: UNUserNotificationCenterDelegate {

    var navigationController: UINavigationController?

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

        if response.actionIdentifier == UNNotificationDefaultActionIdentifier { //User taps notification
             let vc = MyViewController()
             self.navigationController?.pushViewController(vc, animated: true)
        }
    }
}

但是，由于我的项目的根导航控制器现在可以在 iOS 13 中的 SceneDelegate 中定义，我似乎无法弄清楚如何在由 SceneDelegate 而不是 AppDelegate 管理的导航控制器中推送视图。

Answer 1

SceneDelegate可以这样处理通知响应：

class SceneDelegate: UIResponder, UIWindowSceneDelegate {
  func scene(
    _ scene: UIScene,
    willConnectTo session: UISceneSession,
    options connectionOptions: UIScene.ConnectionOptions
  ) {
    if let windowScene = scene as? UIWindowScene {
      let window = UIWindow(windowScene: windowScene)
      // rootViewController set up code
      // say,
      // let mainController = ViewController()
      // let navigationController = UINavigationController(rootViewController: mainController)
      // window.rootViewController = navigationController

      // This is UNNotificationResponse
      if let notificationResponse = connectionOptions.notificationResponse {
        window.makeKeyAndVisible()
        // do the pushing on your navigation controller
        // navigationController.push()
        return
      }

      window.makeKeyAndVisible()
    }
  }
}

Answer 2

如果您的应用支持多窗口或单窗口，您可以使用UNNotificationResponse 上的targetScene 属性来确定通知将启动哪个场景（窗口）。

例子：

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    guard let windowSceneDelegate = response.targetScene?.delegate as? UIWindowSceneDelegate,
          let window = windowSceneDelegate.window,
          let rootViewController = window.rootViewController as? UINavigationController else {
        completionHandler()
        return
    }
    let notificationViewController = UIViewController()
    rootViewController.pushViewController(notificationViewController, animated: true)
    completionHandler()
}