当应用程序在后台运行时，Swiftui 通知徽章不会更新

Question

在我的应用程序中，会在特定时间提供本地生成的通知。通知按预期生成并显示。当应用程序打开时，通知徽章会更新以显示单个通知（再次，如预期），但是，当应用程序位于后台时，徽章不会更新。

//This code schedules a notification for 7 days before a date (action.date)

private func scheduleNotificationIfRequired() {
        let sevenDaysBeforeActionDate = Calendar.current.date(byAdding: .day, value: -7, to: action.date)!
        var triggerDateComponents = Calendar.current.dateComponents([.year, .month, .day, .hour, .minute], from: sevenDaysBeforeActionDate)
        

        triggerDateComponents.hour = 21
        triggerDateComponents.minute = 51
        
        let content = UNMutableNotificationContent()
        content.title = "Upcoming Deadline"
        content.body = "Action Required by: \(formattedDate(from: action.date))"
        content.sound = UNNotificationSound.default

        let trigger = UNCalendarNotificationTrigger(dateMatching: triggerDateComponents, repeats: false)
        
        let identif = action.action + action.name
        
        let request = UNNotificationRequest(identifier: identif, content: content, trigger: trigger)
        
        UNUserNotificationCenter.current().add(request) 
    
    }

class AppDelegate: NSObject, UIApplicationDelegate, UNUserNotificationCenterDelegate {
    
    var viewRouter: ViewRouter?
    
    
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
           
           UNUserNotificationCenter.current().delegate = self
           return true
       }
    
    // Handle notification when the app is in the foreground
    func userNotificationCenter(_ center: UNUserNotificationCenter, willPresent notification: UNNotification, withCompletionHandler completionHandler: @escaping (UNNotificationPresentationOptions) -> Void) {
        // Increment the badge number on the app icon
        let currentbadge = UIApplication.shared.applicationIconBadgeNumber

        UIApplication.shared.applicationIconBadgeNumber = currentbadge + 1
        

        completionHandler([.badge, .sound, .banner]) // Ensure notification banner is displayed
        
        // If the notification is tapped while the app is in the foreground, handle it here
        handleNotification(notification)
    }
    
//This is the code that doesn’t work as expected. “here” is never printed to terminal

    // Handle notification when the app is in the background or terminated
    func userNotificationCenter(_ center: UNUserNotificationCenter, didReceive response: UNNotificationResponse, withCompletionHandler completionHandler: @escaping () -> Void) {
           // Increment the badge number on the app icon
           let currentbadge = UIApplication.shared.applicationIconBadgeNumber
           UIApplication.shared.applicationIconBadgeNumber = currentbadge + 1
           print(currentbadge)
           print("here")
           print(UIApplication.shared.applicationIconBadgeNumber)
           
           completionHandler()
       }
    

}```

Answer 1

仅当用户与您添加到通知中的自定义选项进行交互时，才会调用

didReceive

委托方法。

当通知在后台传递时，应用程序没有机会执行任何代码。