使用iOS 12.1SDK构建原生脚本应用程序时出现问题

import UserNotifications

class NotificationService: 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)

        if let bestAttemptContent = bestAttemptContent {
            // Modify the notification content here...
            bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"
            contentHandler(bestAttemptContent)
        }
    }

    override func serviceExtensionTimeWillExpire() {
        // Called just before the extension will be terminated by the system.
        if let contentHandler = contentHandler, let bestAttemptContent = bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }
}

class MyViewController: UIViewController {
    var heavyObject: HeavyObject?

    override func viewDidLoad() {
        super.viewDidLoad()
        heavyObject = HeavyObject()
        // Do something with heavyObject
    }
}

class MyViewController: UIViewController {
    weak var heavyObject: HeavyObject?

    override func viewDidLoad() {
        super.viewDidLoad()
        heavyObject = HeavyObject()
        // Do something with heavyObject
    }

    deinit {
        heavyObject = nil
    }
}