Question

我正在尝试在推送通知中发送images 我已在app delegate中进行通知注册，并且apns设备令牌正在生成。另外，我在服务分机中编码如下：

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)

// Get the custom data from the notification payload
if let notificationData = request.content.userInfo["data"] as? [String: String] {
    // Grab the attachment
    if let urlString = notificationData["attachment-url"], let fileUrl = URL(string: urlString) {
        // Download the attachment
        URLSession.shared.downloadTask(with: fileUrl) { (location, response, error) in
            if let location = location {
                // Move temporary file to remove .tmp extension
                let tmpDirectory = NSTemporaryDirectory()
                let tmpFile = "file://".appending(tmpDirectory).appending(fileUrl.lastPathComponent)
                let tmpUrl = URL(string: tmpFile)!
                try! FileManager.default.moveItem(at: location, to: tmpUrl)

                // Add the attachment to the notification content
                if let attachment = try? UNNotificationAttachment(identifier: "", url: tmpUrl) {
                    self.bestAttemptContent?.attachments = [attachment]
                }
            }
            // Serve the notification content
            self.contentHandler!(self.bestAttemptContent!)
            }.resume()
    }
}
}
}

。并且json中的有效负载如下

{
    "aps":
            {"sound":"default","alert":
                                        {"title":"iOS","body":"Hello Dude...."},
            "mutable-content": 1},
    "CustomData":
                    {"mType":"alert","m":"Hello Dude...."},
    "Attachement-url":"https://pusher.com/static_logos/320x320.png"
}

我收到标题和消息，但图片未来。请指导如何在推送通知中获取图像

Answer 1

对于Swift，如果您需要，可以尝试使用this framework

同时在你的手势中添加“content-available”：1

或者您可以尝试这样下载，

override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {

            self.contentHandler = contentHandler
            bestAttemptContent = (request.content.mutableCopy() as?UNMutableNotificationContent)

            bestAttemptContent?.title = request.content.title
            bestAttemptContent?.body = request.content.body

            guard let content = (request.content.mutableCopy() as? UNMutableNotificationContent) else {
                return failEarly()
            }

            guard let payload = content.userInfo["CustomData"] as? [String: Any] else {
                return failEarly()
            }

            guard let attachmentURL = payload["Attachement-url"] as? String else {
                return failEarly()
            }


            let identifierName = getIdentifierName(fileURL: attachmentURL)
            let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString

            guard let imageData = NSData(contentsOf:NSURL(string: attachmentURL)! as URL) else { return failEarly() }

            guard let attachment = UNNotificationAttachment.create(imageFileIdentifier: identifierName, data: imageData, options: nil, tmpSubFolderName: tmpSubFolderName) else { return failEarly() }

            content.attachments = [attachment]
            contentHandler(content.copy() as! UNNotificationContent)
        }

    }


    func getIdentifierName(fileURL : String) -> String {
        var identifierName : String = "image.jpg"

        if !fileURL.isEmpty() {
            identifierName = "file.\((fileURL as NSString).lastPathComponent)"
        }

        return identifierName
    }

    func failEarly() {

        if let contentHandler = contentHandler, let bestAttemptContent =  bestAttemptContent {
            contentHandler(bestAttemptContent)
        }
    }

    extension UNNotificationAttachment {
        static func create(imageFileIdentifier: String, data: NSData, options: [NSObject : AnyObject]?, tmpSubFolderName : String) -> UNNotificationAttachment? {

            let fileManager = FileManager.default
            let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString
            let fileURLPath      = NSURL(fileURLWithPath: NSTemporaryDirectory())
            let tmpSubFolderURL  = fileURLPath.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.init(identifier: imageFileIdentifier, url: fileURL!, options: options)
                return imageAttachment
            } catch let error {
                print("error \(error)")
            }

            return nil
        }
    }

Answer 2

此行：

if let urlString = notificationData["attachment-url"], let fileUrl = URL(string: urlString) {

正在寻找一个attachment-url值作为userInfo字典中data对象的子对象。它正在寻找：

{ 
    "aps" : {
        ...
    },
    "data" : {
        "attachment-url" : "some url"
    }
}

但是您问题中的有效载荷是这样的：

{
    "aps":{
        "sound":"default",
        "alert": {
                    "title":"iOS",
                    "body":"Hello Dude...."
                },
        "mutable-content": 1
    },
    "CustomData": {
        "mType":"alert",
        "m":"Hello Dude...."
    },
    "Attachement-url":"https://pusher.com/static_logos/320x320.png"
}

“数据”部分不存在，并且attachment-url键不存在。

更改您的Swift代码以匹配有效负载中的内容，您应该能够获取图像URL并下载它。

如果收到没有没有附件URL密钥或附件URL格式不正确的通知，您将遇到很大的问题。在这些情况下，将不会输入您的if let，也不会调用contentHandler！这不仅会导致服务扩展被锁定，还会阻止传递没有附件URL的任何通知！添加一个调用else的{{1}}来解决此问题。

下载完成后，就会出现另一个问题。 iOS将需要知道您要在附件中放入哪种数据。附件选项字典使您可以包括有关附件的类型信息。获取下载文件的MIME类型，然后从中创建一个统一类型标识符。然后可以在选项字典中使用统一类型标识符字符串。

我在iOS Notifications book中详细介绍了所有这些内容。现在可用的示例章节介绍了将图像添加到通知中。

iOS推送通知中的图像

2 个答案: