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Does anyone know if it is possible to run applications built on top of Unreal Engine (version 5) on the Vision Pro?

I haven't tried screensavers in a while. Now, under macOS 11.6, it appears that screensavers don't stop when I press a key (any key, even Esc), or move the mouse. This happens with the built-in screensaver , such as "Flurry" and others. The only way to escape from screesavers seems to be a mouse click. I was wondering if this is intentional by macOS or if I screwed up the settings of my Mac. If it is intentional, I was wondering what is the rationale behind that change? (it used to be the case that screensavers would stop immediately when the user pressed a key or moved the mouse). If it's my settings on my Mac, which one could it be? Way earlier, under Catalina and before, it used to be the case that screensavers could receive keyboard events and act upon them. Did Apple bring that back? I am asking all this because I am developing a screensaver myself.

I have a strange error when resolving a security-scoped bookmark (SSB) in my screensaver. The code works fine for almost all users (even under Mojave), except for one user under Mojave (10.14.6). Here is the code in question: NSError * error; BOOL isStale = NO; NSURL * dir_location = [NSURL URLByResolvingBookmarkData: bookmark                                                  options: NSURLBookmarkResolutionWithSecurityScope                                            relativeToURL: nil bookmarkDataIsStale: & isStale                                                    error: & error]; The method returns NULL, and error says:  Error Domain=NSCocoaErrorDomain Code=259 "The file couldn't be opened because it isn't in the correct format." The SSB points to a directory in the user's home. I can see that in the log, because in my code I do NSDictionary * dict = [NSURL resourceValuesForKeys: [NSArray arrayWithObjects: NSURLPathKey, nil]                                   fromBookmarkData: bookmark ]; and then I output [dict objectForKey: NSURLPathKey] . The user has opened the directory in the previous run, and I am creating and storing an SSB with this code: NSError * systemError; NSData * dir_bookmark = [dir bookmarkDataWithOptions: NSURLBookmarkCreationWithSecurityScope                       includingResourceValuesForKeys: nil                                        relativeToURL: nil                                                error: &systemError]; and it seems to work just fine. I don't know whether or not it matters: the error occurs in a screensaver of mine, i.e., it occurs when the users launches the screensaver moving the mouse into the respective hot corner. But the SSB is created and resolved by exactly the same .saver executable. Does anyone have an idea why -URLByResolvingBookmarkData might fail? Or could some kind soul give me hints how I might be able to track down the bug? (Of course, I tried to google, to no avail.) I am at a loss here ... Thanks a lot in advance. Best regards, Gabriel

I'd like to upload my app to the Mac App Store and give only a few select testers access to that version on the MAS? Is that possible?

I would like to publish my app on the Mac App Store (MAS). Unfortunately, I haven't had the time yet to I18N it, yet. So, what I would like to do is: distribute my app on all english-speaking MAS' (US, UK, Canadian, Australian) Provide a link on the app's home page that would lead potential users automatically to the US version of the MAS, regardless of their country-specific MAS. (I would tell users, of course, that the app is only available in English.) Is that possible? Best regards, Gabriel

I have an app that works like a slideshow. The app works on macOS Catalina, and it is sandboxed. Now, I would like to provide a mode for running it in "kiosk mode". Requirements: Run in fullscreen Disallow app switching, quitting, etc. Accept keyboard events The currently logged in user should be able to gain full access by authenticating themselves. I have tried to add this code to my AppDelegate: NSApplicationPresentationOptions presentationOptions =(NSApplicationPresentationHideDock | NSApplicationPresentationHideMenuBar | NSApplicationPresentationDisableAppleMenu | NSApplicationPresentationDisableProcessSwitching | NSApplicationPresentationDisableForceQuit | NSApplicationPresentationDisableHideApplication ); NSDictionary *fullScreenOptions = @{ NSFullScreenModeApplicationPresentationOptions: @(presentationOptions) }; [self.window.contentView enterFullScreenMode: [NSScreen mainScreen] withOptions: fullScreenOptions ]; It does provide kind of a kiosk mode, but my app does not receive any key events any more. It does not matter whether I put this code in -awakeFromNib or in -applicationWillFinishLaunching or in -applicationDidFinishLaunching, I always get the "Funk" sound. Of course, when I omit the above lines of code, everything works fine, i.e., I receive key events as usual. I could switch to fullscreen just by calling [self.window toggleFullScreen: nil] but then I don't have the kiosk mode precautions, like preventing the user from switching to other apps. The second problem I am facing is this: I would like to allow users to quit the app, provided they can authenticate themselves (requirement #4). There used to be an API ( https://developer.apple.com/documentation/security/authorization_services ), but it is not available in a sandboxed app. (I don't get Apple's reasoning, but oh well ...) Question is: is there any way to achieve what I want?

On the WWDC 2020 page ( https://developer.apple.com/wwdc20/ ) , I found the notice at the bottom that one can request a appointment with an Apple engineer for one-on-one technical guidance.However, being new in this space, I could not find out how to do that.(Yes, I do have a Apple Developer Program membership.)Could some kind soul enlighten me?Thanks a lot in advance.

I have a problem with programmatically deleting files that reside on an external disk,which must be accessed using security-scoped bookmarks.In my app, I collect lists of files that reside on an external disk.After the user has opened the directory of the files, I create a security-scoped bookmark like this: directoryBookmark_ = [dir bookmarkDataWithOptions: NSURLBookmarkCreationWithSecurityScope includingResourceValuesForKeys: nil relativeToURL: nil error: &systemError];Next time, the app runs, I resolve the bookmark like this: directoryLocation_ = [NSURL URLByResolvingBookmarkData: directoryBookmark_ options: NSURLBookmarkResolutionWithSecurityScope relativeToURL: nil bookmarkDataIsStale: & isStale error: & error]; [directoryLocation_ startAccessingSecurityScopedResource];(directoryBookmark_ is saved and loaded in the user preferences.)At some later point, my app wants to delete one of the files in that directory (or sub-directory),like this: NSString * abs_path = [self absolutePathFor: filename_]; BOOL success = [self deleteFile: abs_path ];This does not work. In the log, I get the error message:Failed to delete /Volumes/.../image.jpg: “image.jpg” couldn’t be moved to the trash because you don’t have permission to access it.!I then try to get more info about the problem using this code: NSURL * imgurl = [NSURL fileURLWithPath: abs_path isDirectory: NO]; NSError * error; NSFileHandle * fileHandle = [NSFileHandle fileHandleForUpdatingURL: imgurl error: & error];But it always returns a valid fileHandle, i.e., there is no error.I selected "Read/Write" in the "User Selected File" entitlement of my app.Of course, everything works fine when the files reside on my local disk (even across multiple invocations of the app).The external disk is just a hard disk connected via USB to my laptop.Deleting the files manually on the external hard disk works, of course.Does anyone have an idea what mistake I might be making?Or is there a way to get the necessary permission?Surely, apps must have a way of deleting files programmatically, don't they?At least, appe's docs don't mention anything indicating otherwise.All hints and insights will be highly appreciated.