NotificationServiceExtension停止工作

如何解决NotificationServiceExtension停止工作

我正在尝试使用unnotificationserviceextension实现应用程序徽章解决方案。当我实施基本解决方案时。它显示的是[modified]标题，但是当我添加应用程序分组解决方案并尝试访问UserDefaults时，它将停止工作

import UserNotifications

NotificationService类：unnotificationserviceextension {

var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?

override func didReceive(_ request: UNNotificationRequest,withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
    self.contentHandler = contentHandler
    bestAttemptContent = (request.content.mutablecopy() as? UNMutableNotificationContent)

    let defaults = UserDefaults(suiteName: "group.hu.focifc.focifc")

    var count: Int = defaults!.value(forKey: "count") as! Int
    
    if let bestAttemptContent = bestAttemptContent {
        // Modify the notification content here...
        bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"
        //bestAttemptContent.badge = count as? NSNumber
        //count = count + 1
        //defaults?.set(count,forKey: "count")
        
        contentHandler(bestAttemptContent)
    }
}

override func serviceExtensionTimeWillExpire() {
    // Called just before the extension will be terminated by the system.
    // Use this as an opportunity to deliver your "best attempt" at modified content,otherwise the original push payload will be used.
    if let contentHandler = contentHandler,let bestAttemptContent =  bestAttemptContent {
        contentHandler(bestAttemptContent)
    }
}

}

当我删除或取消注释... var count：Int ...行时，它没有完成工作。

有什么主意吗？