ios - 从 AppDelegate 向 ViewController 推送远程通知

Question

我有一个问题正在尝试解决。我有一个标签栏作为我的 rootViewController 定义如下窗口？.rootViewController = MainTabViewController()我需要使用下面的代码片段从远程推送通知推送到 viewController，但我的应用程序崩溃 cannot Cast MainTabViewController to UINavigationViewController 我知道我无法执行该转换，因为 MainTabViewController 未嵌入 NavigationViewController 中。解决这个问题的最佳方法是什么？

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

    let userInfo = response.notification.request.content.userInfo

    if let type = userInfo["type"] as? String, let data = userInfo["data"] as? String, let title = userInfo["title"] as? String {
        let params = ["type": type, "data": data, "title": title]
        Analytics.AddEvent(title: "Notification Open", params: params)

        let backItem = UIBarButtonItem()
        backItem.title = ""
        let navVC = window?.rootViewController as! UINavigationController
        NSLog("Controller Type: \(navVC.description)")
        navVC.navigationController?.navigationBar.tintColor = .black
        navVC.navigationItem.backBarButtonItem = backItem
        if type == "category_product"{
            //Show product list
            var params = [String: String]()
            params["CategoryName"] = title
            params["CategoryId"] = data
            Analytics.AddEvent(title: "Category Opened", params: params)

            let vc = ProductListingVC()
            vc.categoryName = title
            vc.category_id = data
            vc.hidesBottomBarWhenPushed = false
            navVC.pushViewController(vc, animated: true)
        }

Answer 1

您将 tabBarController 作为 rootViewController 并且将其类型转换为导航 Controller ，这是代码中的问题。您需要将 rootViewController 转换为 MainTabViewController，然后在 MainTabViewController 上获取所选选项卡(如果您有导航 Controller )，然后推送 ProductListingVC Controller 到该导航 Controller ，否则您需要呈现 ProductListingVC。