ios - 当应用程序被终止/强制退出时设置角标(Badge)计数

Question

当应用程序被终止/强制退出时，我需要设置角标(Badge)计数，我尝试了静默通知(您可以在下面看到badge_reset逻辑)，但它们仅在应用程序处于前台/后台时才有效。

func application(_ application: UIApplication, didReceiveRemoteNotification userInfo: [AnyHashable: Any],
                 fetchCompletionHandler completionHandler: @escaping (UIBackgroundFetchResult) -> Void) {

    if let action = userInfo["action"] as? String {
        switch action {
            case "badge_reset":
                    if let badge = userInfo["badge"] as? String {
                        let badge: Int = (badge as NSString).integerValue;
                        if (badge >= 0) {
                            application.applicationIconBadgeNumber = badge;
                        } else {
                            application.applicationIconBadgeNumber = 0;
                        }
                    }
                break;
            default:
                break;
        }
    } else {
        if let aps = userInfo["aps"] as? NSDictionary {
            if let alert = aps["alert"] as? NSDictionary {

                let title = alert["title"] as! String;
                let body = alert["body"] as! String;
                let link = userInfo["link"] as! String;

                if (UIApplication.shared.applicationState == .active) {
                    if let controller = self.window?.rootViewController {
                        let image = UIImage(named: "Notification");
                        let announcement = Announcement(title: title, subtitle: body, image: image, duration: 10, action: {
                            let storyboard = UIStoryboard(name: "Main", bundle: nil)
                            if let controller = storyboard.instantiateViewController(withIdentifier: "ShitstuffController") as? ViewController {
                                controller.loadViewIfNeeded();
                                controller.link = link;

                                self.window?.rootViewController = controller;
                            }
                        })

                        Whisper.show(shout: announcement, to: controller)
                    }
                }

            } else if let alert = aps["alert"] as? NSString {
                //
            }
        }
    }

    completionHandler(UIBackgroundFetchResult.newData)
}

func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
    let content = response.notification.request.content;

    if let link = content.userInfo["link"] as? String {
        let storyboard = UIStoryboard(name: "Main", bundle: nil)
        if let controller = storyboard.instantiateViewController(withIdentifier: "ShitstuffController") as? ViewController {

            controller.loadViewIfNeeded();
            controller.link = link;

            self.window?.rootViewController = controller;
        }
    }

    completionHandler();
}

我确信这是可能的，因为无论应用程序处于事件/隐藏/终止/退出/等状态，Gmail 都会更新角标(Badge)计数，但无法找到具体方法，StackOverflow 上的一些主题说 WhatsUp/Gmail 只是垃圾邮件“已读通知”状态，但我找不到有关此类通知的任何信息。

Answer 1

你尝试过这个方法吗:

func applicationWillTerminate(_ application: UIApplication) {
    // set your badge 
}