ios - 如何在收到推送通知时更新角标(Badge)号码

Question

我需要帮助完成这段代码，以便应用程序在收到推送通知时显示角标(Badge)编号，我可以收到推送通知，但应用程序上没有角标(Badge)，这是代码

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

if let aps = userInfo["aps"] as? NSDictionary, let _ = aps["alert"] as?   String, let sound = aps["sound"] as? String
         {

             if let systemSound = SystemSoundID(sound) {
             AudioServicesPlayAlertSound(systemSound)
         }

         NotificationCenter.default.post(name: Notification.Name(rawValue: SystemSetting.refreshCouponListNotification), object: nil)

         completionHandler(UIBackgroundFetchResult.newData)
     }
 }

Answer 1

有两个方法被调用用于推送通知

1. 前台方法
2. 后台方法

1.前台方法。

    func userNotificationCenter(_ center: UNUserNotificationCenter, 
               willPresent notification: UNNotification,withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void)

获取通知请求的内容

let content = notification.request.content

2.后台方法

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

获取通知请求的内容

let content = response.notification.request.content

获取角标(Badge)计数

let badge = content.badge as! Int