ios - 在没有 Storyboard的情况下点击通知时访问特定的 ViewController(以编程方式)

Question

我有一个包含 3 个选项卡的应用程序:- 家- 收件箱- 简介

当用户收到通知时，我想打开相应的聊天，当用户按下后退按钮时，我希望能够打开收件箱标签。

我的以下代码是这样的:

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

            let notificationContent = response.notification.request.content

            switch notificationContent.categoryIdentifier {

            case "ChatViewController":

                let tabBarVC = self.window?.rootViewController as! MainTabViewController

                tabBarVC.selectedIndex = 1 // This is the Inbox tab

                let chatVC = ChatViewController(collectionViewLayout: UICollectionViewFlowLayout())

                let inboxVC = InboxViewController()

                inboxVC.navigationController?.pushViewController(chatVC, animated: true)

            default:
                return
            }


            completionHandler()
        }

但是在这行 tabBarVC.selectedIndex = 1 之后，代码没有被读取，它打开了 InboxViewController，这是为什么，我如何打开聊天？

Answer 1

使用

对选定的 Controller 进行检查太简单了

let selectedController = tabBarVC.selectedViewController? 

功能齐全

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

                let notificationContent = response.notification.request.content

                switch notificationContent.categoryIdentifier {

                case "ChatViewController":

                    let tabBarVC = self.window?.rootViewController as! MainTabViewController

                    tabBarVC.selectedIndex = 1 // This is the Inbox tab

                    let chatVC = ChatViewController(collectionViewLayout: UICollectionViewFlowLayout())

              if let selectedController = tabBarVC?.selectedViewController as? InboxViewController
        {
            selectedController?.navigationController?.pushViewController(chatVC, animated: true)
        }               

                default:
                    return
                }


                completionHandler()
            }