带有 UIImage 或远程 URL 的 UNNotificationAttachment

In my Notification Service Extension我正在从 URL 下载图像以显示为UNNotificationAttachment在通知中。

因此，我将此图像作为 UIImage，并且不需要将其写入光盘上的应用程序目录/组容器中以设置通知。

有没有好的方法创建一个UNNotificationAttachment与 UIImage ？（应该适用于本地和远程通知）

1. 在tmp文件夹中创建目录
2. 写下NSData的代表UIImage进入新创建的目录
3. 使用 tmp 文件夹中文件的 url 创建 UNNotificationAttachment
4. 清理tmp文件夹

我写了一个扩展UINotificationAttachment

extension UNNotificationAttachment {

    static func create(identifier: String, image: UIImage, options: [NSObject : AnyObject]?) -> UNNotificationAttachment? {
        let fileManager = FileManager.default
        let tmpSubFolderName = ProcessInfo.processInfo.globallyUniqueString
        let tmpSubFolderURL = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent(tmpSubFolderName, isDirectory: true)
        do {
            try fileManager.createDirectory(at: tmpSubFolderURL, withIntermediateDirectories: true, attributes: nil)
            let imageFileIdentifier = identifier+".png"
            let fileURL = tmpSubFolderURL.appendingPathComponent(imageFileIdentifier)
            let imageData = UIImage.pngData(image)
            try imageData()?.write(to: fileURL)
            let imageAttachment = try UNNotificationAttachment.init(identifier: imageFileIdentifier, url: fileURL, options: options)
            return imageAttachment
        } catch {
            print("error " + error.localizedDescription)
        }
        return nil
    }
}

所以要创建UNUserNotificationRequest with UNUserNotificationAttachment from a UIImage你可以简单地这样做

let identifier = ProcessInfo.processInfo.globallyUniqueString
let content = UNMutableNotificationContent()
content.title = "Hello"
content.body = "World"
if let attachment = UNNotificationAttachment.create(identifier: identifier, image: myImage, options: nil) {
    // where myImage is any UIImage
    content.attachments = [attachment] 
}
let trigger = UNTimeIntervalNotificationTrigger(timeInterval: 120.0, repeats: false)
let request = UNNotificationRequest.init(identifier: identifier, content: content, trigger: trigger)
UNUserNotificationCenter.current().add(request) { (error) in
    // handle error
}

这应该有效，因为UNNotificationAttachment会将图像文件复制到自己的位置。