ios - 具有UIImage或远程URL的UNNotificationAttachment

在Notification Service Extension中，我正在从URL下载图像，以在通知中显示为UNNotificationAttachment。

因此，我将此图像作为UIImage，没有看到仅在设置通知时将其写在光盘上的应用程序目录/组容器中的必要。

是否有一个很好的方法用UIImage创建UNNotificationAttachment？
(应适用于本地和远程通知)

最佳答案

在tmp文件夹

中创建目录

将NSData的UIImage表示形式写入新创建的目录

使用URL到tmp文件夹

中的文件创建UNNotificationAttachment

清理tmp文件夹

我在UINotificationAttachment上写了扩展

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
    }
}

因此，要从UNUserNotificationRequest中使用UNUserNotificationAttachment创建UIImage，您可以像这样简单地做某事

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
}

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

关于ios - 具有UIImage或远程URL的UNNotificationAttachment，我们在Stack Overflow上找到一个类似的问题：https://stackoverflow.com/questions/39103095/