M1 specific crash for "try UNNotificationAttachment(identifier: "image", url: fileURL)"

Number:rdar://FB10017548 Date Originated:13/05/22
Status:Open Resolved:
Product:Developer Tools Product Version:iOS 15
Classification:Error/Incorrect/Unexpected Behavior Reproducible:Always
I am having an issue with the UserNotifications framework only on M1 machines. The following function call crashes only on M1 but works fine for the same version of Xcode (13.2.1+) and iOS 15.2+:

`try UNNotificationAttachment(identifier: "image", url: fileURL)`

The full snippet is here:

private func attachment(for image: UIImage) -> UNNotificationAttachment? {
		guard let data = image.pngData() else {
			return nil
		let tempDirectory = URL(fileURLWithPath: NSTemporaryDirectory())
			.appendingPathComponent("titan_notification_request_images", isDirectory: true)
		do {
			try FileManager.default.createDirectory(at: tempDirectory,
													withIntermediateDirectories: true,
													attributes: nil)
			let uniqueFilename = "\(image.hashValue).png"
			let fileURL = tempDirectory.appendingPathComponent(uniqueFilename)
			try data.write(to: fileURL)
			return try UNNotificationAttachment(identifier: "image", url: fileURL)
		} catch let error {
			return nil

I get the following error message:

“Unrecognized attachment file type”

The other lines above do not throw any errors. Hope you can advise, thanks!


  • the same version of Xcode (13.2.1+) and iOS 15.2+ on Intel Macs

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