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我正在尝试使用像这样的扩展图像在我的应用程序上显示丰富的通知。我已经使用通知服务扩展在应用程序中实现了这一点。 在此处输入图像描述

但是当我收到通知时，我只会得到一个缩略图，看起来像这样。当我长按支持 3D 触控的手机时，会出现展开的图像，否则它只会在没有 3D 触控的手机上显示缩略图。

在此处输入图像描述

我找不到关于 SO 的任何文档或任何问题，如果可能的话，它解释了如何执行此操作。我想知道是否可以在 iOS 上执行此操作，如果没有，是否有任何可能的解决方法来完成此操作？这是我的NotificationSerivce扩展。任何帮助深表感谢！谢谢！

class NotificationService: UNNotificationServiceExtension {

    let fileManager = FileManager()
    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...
            guard let content = (request.content.mutableCopy() as? UNMutableNotificationContent) else {
                return self.contentHandler = contentHandler
            }

            bestAttemptContent.title = "\(bestAttemptContent.title) [modified]"            

            guard let attachmentURL = content.userInfo["attachment-url"] as? String else {
                return self.contentHandler = contentHandler
            }
            guard let fileName = attachmentURL.components(separatedBy: "/").last else {
                return self.contentHandler = contentHandler
            }

            guard let imageData = try? Data(contentsOf: URL(string: attachmentURL)!) else {
                return self.contentHandler = contentHandler
            }


            if let thumbnailAttachment = UNNotificationAttachment.create(imageFileIdentifier: fileName, data: imageData, options: nil) {
                bestAttemptContent.attachments = [thumbnailAttachment]
            }

            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)
        }
    }

}

extension UNNotificationAttachment {

    /// Save the image to disk
    static func create(imageFileIdentifier: String, data: Data, options: [AnyHashable: Any]?) -> UNNotificationAttachment? {
        let fileManager = FileManager.default
        let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString
        let tmpSubFolderURL = NSURL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(tmpSubFolderName, isDirectory: true)

        do {
            try fileManager.createDirectory(at: tmpSubFolderURL!, withIntermediateDirectories: true, attributes: nil)
            let fileURL = tmpSubFolderURL?.appendingPathComponent(imageFileIdentifier)

            try data.write(to: fileURL!, options: [])
            let imageAttachment = try UNNotificationAttachment(identifier: imageFileIdentifier, url: fileURL!, options: options)
            return imageAttachment
        } catch let error {
            print("error \(error)")
        }

        return nil
    }
}
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1 回答 1

2

这是一个非常古老的问题，我想您现在已经发现，您要实现的目标在技术上是不可行的。通知以折叠的形式显示，并且只有当用户在通知上 3d 按下（或在没有 3d-touch 的设备的情况下长按）时，它们才会以展开的形式显示。

于 2019-11-20T17:30:23.197 回答