从AppDelegate将远程通知推送到ViewController

Question

I have a problem am trying to solve. I have a tabbar as my rootViewController defined like this window?.rootViewController = MainTabViewController() I need to push to a viewController From a remote push notification with the snippet below, but my app crash with cannot cast MainTabViewController to UINavigationViewController I know I cannot do that cast since MainTabViewController is not embedded in a NavigationViewController. What is the best way to approach this?

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

You have tabBarController as rootViewController and you are type casting it into navigation controller, this is the issue in your code. You need to cast your rootViewController to MainTabViewController and then get the selected tab on your MainTabViewController if there you have navigation controller then push the ProductListingVC controller to that navigation controller else you need to present ProductListingVC .