I've implemented the NSFilePresenter protocol in a Mac app (Catalina 10.15.3 Xcode 10.15.3) to watch a directory.Most protocol methods get called correctly, but some don't get called at all. For some there are (cumbersome) alternatives, but if, for example a file is immediately deleted in Finder using option+command+del, the NSFilePresenter delegate never receives any callback. Is there a workaround to trigger the callbacks?final class FileController: NSObject, NSFilePresenter { ... init() { presentedItemURL = // Some directory NSFileCoordinator.addFilePresenter(self) } func accommodatePresentedItemDeletion(completionHandler: @escaping (Error?) -> Void) { // Never gets called completionHandler(nil) } func presentedSubitemDidAppear(at url: URL) { // Never gets called } func presentedSubitemDidChange(at url: URL) { // Does get called } }

I've added an SVG image to the asset catalogue of a SwiftUI project in Xcode 12 beta 3, and set 'Render as' to 'original'. The gradient background in the SVG image gets rendered in different ways depending on the platform. In the Xcode's asset catalogue's preview, the gradient is rendered as a solid color In the MacOS version of the SwiftUI app, the gradient appears as a solid color as well In the iOS version of the SwiftUI app, the gradient appears as a solid white area. I understand Xcode is in beta and not everything feature is working and I was wondering if this is an issue (assuming it is a bug) that will be fixed in an upcoming beta version, or if I should switch to a different file format for my images.

My Safari Extension on iOS needs access to a Keychain item (password) that is secured by the userPresence and devicePasscode flag. In other words, FaceID/TouchID or the device PIN is necessary to access the password. Is there a way for the extension to access the password? SafariWebExtensionHandler.swift has access to the Keychain, but can't present FaceID/TouchID/device PIN interface to the user. Popup.js has UI access, but can't access the iOS Keychain. One hack is to set touchIDAuthenticationAllowableReuseDuration of the Keychain item to an arbitrary time and have the user authenticate in the containing app. However, in case of a time-out, the containing app has be opened by the extension with a custom URL scheme. openURL is not accessible in SafariWebExtensionHandler.swift either (I assume it can be handled by popup.js). This is a user-unfriendly solution. What is the best way to give the Safari extension access to a Keychain item?

It seems that the mail app sets its mail headers after additionalHeaders(for:) is called, overwriting standard headers set by the extension, such as Content-Type. It also seems the Mail app decides whether an email is of content type text/plain or multipart/alternative;  boundary="Apple-Mail=[...]" based on the user input. If the user only inputs plain text (i.e. using no font formatting options or adding an attachment) then Content-Type will always default to text/plain. This causes an issue in encode(_:, composeContext:) if the signature should be included as an attachment. First of all, it seems impossible to force Mail to set Content-Type to multipart/alternative and even if the message is set to multipart/alternative (e.g. b/c the user made text bold), the ecode method doesn't know the boundary string set by Apple mail (Apple-Mail=[hash]). Is there a way to create an attachment in encode?