我正在使用Apple去年在iOS 10中宣布的功能。我的问题是通知中的图片有时为空。
这是我的UNNotificationServiceExtension ..我不太确定自己在做什么错。图像的最大大小为1 MB。服务器的有效负载正确。
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 {
// Setting the category associated with the notification
if let category = bestAttemptContent.userInfo["category"] as? String {
bestAttemptContent.categoryIdentifier = category
}
// Fetching luubra if available
if let attachmentString = bestAttemptContent.userInfo["image"] as? String,
let attachmentUrl = URL(string: attachmentString) {
let session = URLSession(configuration: URLSessionConfiguration.default)
let attachmentDownloadTask = session.downloadTask(with: attachmentUrl,
completionHandler: { url, _, error in
if let error = error {
print("Error downloading notification image: \(error)")
} else if let url = url {
do {
let attachment = try UNNotificationAttachment(identifier: attachmentString,
url: url,
options: [UNNotificationAttachmentOptionsTypeHintKey: kUTTypeJPEG])
bestAttemptContent.attachments = [attachment]
} catch let e {
print("Error creating NotificationAttachment: \(e)")
}
}
print("Remote notification content: \(bestAttemptContent)")
contentHandler(bestAttemptContent)
})
attachmentDownloadTask.resume()
}
}
}
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)
}
}
}
最佳答案
看来苹果公司将设置直接关联的类别，例如标题或正文内容。
将媒体临时保存到磁盘很重要。因为iOS需要一些时间来下载媒体文件。 iOS将处理其余的工作。
这对我来说很棒。
class NotificationService: UNNotificationServiceExtension {
var contentHandler: ((UNNotificationContent) -> Void)?
var bestAttemptContent: UNMutableNotificationContent?
override func didReceive(_ request: UNNotificationRequest, withContentHandler contentHandler: @escaping (UNNotificationContent) -> Void) {
self.contentHandler = contentHandler
self.bestAttemptContent = (request.content.mutableCopy() as? UNMutableNotificationContent)
func failed() {
contentHandler(request.content)
}
guard let contentHandler = self.contentHandler, let bestAttemptContent = self.bestAttemptContent else {
return failed()
}
// Get the image from the User Payload
guard let imageURLString = request.content.userInfo["image"] as? String else {
return failed()
}
guard let imageURL = URL(string: imageURLString) else {
return failed()
}
// Download the Image Async
URLSession.shared.downloadTask(with: imageURL) { (path, _, error) in
if let error = error {
print(error.localizedDescription)
}
if let path = path {
// Save the image temporary to the disk
let tmpDirectory = NSTemporaryDirectory()
let tmpFile = "file://".appending(tmpDirectory).appending(imageURL.lastPathComponent)
guard let tmpURL = URL(string: tmpFile) else { return }
try? FileManager.default.moveItem(at: path, to: tmpURL)
// Add the attachment to the notification content
if let attachment = try? UNNotificationAttachment(identifier: "", url: tmpURL) {
bestAttemptContent.attachments = [attachment]
}
}
// Serve the notification content
contentHandler(bestAttemptContent)
}.resume()
}
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)
}
}
}